Merge pull request #102 from orange-cpp/feature/gjk_algorithm

Feature/gjk algorithm

.github/workflows/cmake-multi-platform.yml

@@ -84,3 +84,39 @@ jobs:
       - name: Run unit_tests.exe
         shell: bash
         run: ./out/Release/unit_tests.exe
+
+  ##############################################################################
+  # 3)  macOS  –  AppleClang / Ninja
+  ##############################################################################
+  macosx-build-and-test:
+    name: macOS (AppleClang)
+    runs-on: macOS-latest
+    env:
+      VCPKG_ROOT: ${{ github.workspace }}/vcpkg
+    steps:
+      - name: Install basic tool-chain with Homebrew
+        shell: bash
+        run: |
+          brew install cmake ninja
+
+      - name: Checkout repository (with sub-modules)
+        uses: actions/checkout@v4
+        with:
+          submodules: recursive
+
+      - name: Set up vcpkg
+        shell: bash
+        run: |
+          git clone https://github.com/microsoft/vcpkg "$VCPKG_ROOT"
+          
+      - name: Configure (cmake --preset)
+        shell: bash
+        run: cmake --preset darwin-release-vcpkg -DOMATH_BUILD_TESTS=ON -DOMATH_BUILD_BENCHMARK=OFF -DVCPKG_MANIFEST_FEATURES="imgui;avx2;tests"
+
+      - name: Build
+        shell: bash
+        run: cmake --build cmake-build/build/darwin-release-vcpkg --target unit_tests omath
+
+      - name: Run unit_tests
+        shell: bash
+        run: ./out/Release/unit_tests

.idea/editor.xml

@@ -201,7 +201,7 @@
     <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppStaticDataMemberInUnnamedStruct/@EntryIndexedValue" value="WARNING" type="string" />
     <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppStaticSpecifierOnAnonymousNamespaceMember/@EntryIndexedValue" value="SUGGESTION" type="string" />
     <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppStringLiteralToCharPointerConversion/@EntryIndexedValue" value="WARNING" type="string" />
-    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppTabsAreDisallowed/@EntryIndexedValue" value="DO_NOT_SHOW" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppTabsAreDisallowed/@EntryIndexedValue" value="WARNING" type="string" />
     <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppTemplateArgumentsCanBeDeduced/@EntryIndexedValue" value="HINT" type="string" />
     <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppTemplateParameterNeverUsed/@EntryIndexedValue" value="HINT" type="string" />
     <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppTemplateParameterShadowing/@EntryIndexedValue" value="WARNING" type="string" />
@@ -215,7 +215,7 @@
     <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppUnmatchedPragmaEndRegionDirective/@EntryIndexedValue" value="WARNING" type="string" />
     <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppUnmatchedPragmaRegionDirective/@EntryIndexedValue" value="WARNING" type="string" />
     <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppUnnamedNamespaceInHeaderFile/@EntryIndexedValue" value="WARNING" type="string" />
-    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppUnnecessaryWhitespace/@EntryIndexedValue" value="DO_NOT_SHOW" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppUnnecessaryWhitespace/@EntryIndexedValue" value="WARNING" type="string" />
     <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppUnsignedZeroComparison/@EntryIndexedValue" value="WARNING" type="string" />
     <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppUnusedIncludeDirective/@EntryIndexedValue" value="WARNING" type="string" />
     <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppUseAlgorithmWithCount/@EntryIndexedValue" value="SUGGESTION" type="string" />

CMakePresets.json

@@ -127,7 +127,8 @@
       "binaryDir": "${sourceDir}/cmake-build/build/${presetName}",
       "installDir": "${sourceDir}/cmake-build/install/${presetName}",
       "cacheVariables": {
-        "CMAKE_CXX_COMPILER": "clang++"
+        "CMAKE_CXX_COMPILER": "clang++",
+        "CMAKE_MAKE_PROGRAM": "ninja"
       },
       "condition": {
         "type": "equals",
@@ -135,6 +136,17 @@
         "rhs": "Darwin"
       }
     },
+    {
+      "name": "darwin-base-vcpkg",
+      "hidden": true,
+      "inherits": "darwin-base",
+      "cacheVariables": {
+        "OMATH_BUILD_VIA_VCPKG": "ON",
+        "CMAKE_TOOLCHAIN_FILE": "$env{VCPKG_ROOT}/scripts/buildsystems/vcpkg.cmake",
+        "VCPKG_INSTALLED_DIR": "${sourceDir}/cmake-build/vcpkg_installed",
+        "VCPKG_MANIFEST_FEATURES": "tests;imgui;avx2"
+      }
+    },
     {
       "name": "darwin-debug",
       "displayName": "Darwin Debug",
@@ -146,7 +158,7 @@
     {
       "name": "darwin-debug-vcpkg",
       "displayName": "Darwin Debug",
-      "inherits": "darwin-base",
+      "inherits": "darwin-base-vcpkg",
       "cacheVariables": {
         "CMAKE_BUILD_TYPE": "Debug"
       }
@@ -154,7 +166,7 @@
     {
       "name": "darwin-release",
       "displayName": "Darwin Release",
-      "inherits": "darwin-debug",
+      "inherits": "darwin-base",
       "cacheVariables": {
         "CMAKE_BUILD_TYPE": "Release"
       }
@@ -162,7 +174,7 @@
     {
       "name": "darwin-release-vcpkg",
       "displayName": "Darwin Release",
-      "inherits": "darwin-debug",
+      "inherits": "darwin-base-vcpkg",
       "cacheVariables": {
         "CMAKE_BUILD_TYPE": "Release"
       }

README.md

@@ -113,12 +113,12 @@ if (auto screen = camera.world_to_screen(world_position)) {
 
 ## 📚 Documentation
 
-- **[Getting Started Guide](https://libomath.org/getting_started/)** - Installation and first steps
+- **[Getting Started Guide](http://libomath.org/getting_started/)** - Installation and first steps
-- **[API Overview](https://libomath.org/api_overview/)** - Complete API reference
+- **[API Overview](http://libomath.org/api_overview/)** - Complete API reference
-- **[Tutorials](https://libomath.org/tutorials/)** - Step-by-step guides
+- **[Tutorials](http://libomath.org/tutorials/)** - Step-by-step guides
-- **[FAQ](https://libomath.org/faq/)** - Common questions and answers
+- **[FAQ](http://libomath.org/faq/)** - Common questions and answers
-- **[Troubleshooting](https://libomath.org/troubleshooting/)** - Solutions to common issues
+- **[Troubleshooting](http://libomath.org/troubleshooting/)** - Solutions to common issues
-- **[Best Practices](https://libomath.org/best_practices/)** - Guidelines for effective usage
+- **[Best Practices](http://libomath.org/best_practices/)** - Guidelines for effective usage
 
 ## 🤝 Community & Support
 

examples/CMakeLists.txt

@@ -1,4 +1,9 @@
 project(examples)
 
-add_executable(ExampleProjectionMatrixBuilder example_proj_mat_builder.cpp)
+add_executable(example_projection_matrix_builder example_proj_mat_builder.cpp)
-target_link_libraries(ExampleProjectionMatrixBuilder PRIVATE omath::omath)
+set_target_properties(example_projection_matrix_builder PROPERTIES CXX_STANDARD 26)
+target_link_libraries(example_projection_matrix_builder PRIVATE omath::omath)
+
+add_executable(example_signature_scan example_signature_scan.cpp)
+set_target_properties(example_signature_scan PROPERTIES CXX_STANDARD 26)
+target_link_libraries(example_signature_scan PRIVATE omath::omath)

examples/example_signature_scan.cpp

@@ -0,0 +1,39 @@
+//
+// Created by Vlad on 11/8/2025.
+//
+
+#include <iostream>
+#include <omath/utility/pe_pattern_scan.hpp>
+#include <print>
+
+int main()
+{
+    std::println("OMATH Signature Scanner");
+
+    std::print("Enter path to PE file: ");
+    std::string file_path;
+    std::getline(std::cin, file_path); // allows spaces
+
+    std::print("Enter target section: ");
+    std::string section;
+    std::getline(std::cin, section);
+
+    std::print("Enter signature: ");
+    std::string signature;
+    std::getline(std::cin, signature);
+
+    std::println("[LOG] Performing scan....");
+
+    const auto result = omath::PePatternScanner::scan_for_pattern_in_file(file_path, signature, section);
+
+    if (!result)
+    {
+        std::println("[ERROR] Scan failed or signature was not found");
+        return -1;
+    }
+
+    std::println("Found at virtual 0x{:x} , raw 0x{:x}", result->virtual_base_addr + result->target_offset,
+               result->raw_base_addr + result->target_offset);
+
+    return 0;
+}

include/omath/3d_primitives/mesh.hpp

@@ -0,0 +1,102 @@
+//
+// Created by Vladislav on 09.11.2025.
+//
+#pragma once
+#include "omath/linear_algebra/triangle.hpp"
+#include <omath/linear_algebra/mat.hpp>
+#include <omath/linear_algebra/vector3.hpp>
+#include <utility>
+#include <vector>
+
+namespace omath::primitives
+{
+    template<class Mat4X4, class RotationAngles, class MeshTypeTrait, class Type = float>
+    class Mesh final
+    {
+    public:
+        using NumericType = Type;
+
+    private:
+        using Vbo = std::vector<Vector3<NumericType>>;
+        using Vao = std::vector<Vector3<std::size_t>>;
+
+    public:
+        Vbo m_vertex_buffer;
+        Vao m_vertex_array_object;
+
+        Mesh(Vbo vbo, Vao vao, const Vector3<NumericType> scale = {1, 1, 1,})
+            : m_vertex_buffer(std::move(vbo)), m_vertex_array_object(std::move(vao)), m_scale(scale)
+        {
+        }
+        void set_origin(const Vector3<NumericType>& new_origin)
+        {
+            m_origin = new_origin;
+            m_to_world_matrix = std::nullopt;
+        }
+
+        void set_scale(const Vector3<NumericType>& new_scale)
+        {
+            m_scale = new_scale;
+            m_to_world_matrix = std::nullopt;
+        }
+
+        void set_rotation(const RotationAngles& new_rotation_angles)
+        {
+            m_rotation_angles = new_rotation_angles;
+            m_to_world_matrix = std::nullopt;
+        }
+
+        [[nodiscard]]
+        const Vector3<NumericType>& get_origin() const
+        {
+            return m_origin;
+        }
+
+        [[nodiscard]]
+        const Vector3<NumericType>& get_scale() const
+        {
+            return m_scale;
+        }
+
+        [[nodiscard]]
+        const RotationAngles& get_rotation_angles() const
+        {
+            return m_rotation_angles;
+        }
+
+        [[nodiscard]]
+        const Mat4X4& get_to_world_matrix() const
+        {
+            if (m_to_world_matrix)
+                return m_to_world_matrix.value();
+            m_to_world_matrix =
+                    mat_translation(m_origin) * mat_scale(m_scale) * MeshTypeTrait::rotation_matrix(m_rotation_angles);
+
+            return m_to_world_matrix.value();
+        }
+
+        [[nodiscard]]
+        Vector3<float> vertex_to_world_space(const Vector3<float>& vertex) const
+        {
+            auto abs_vec = get_to_world_matrix() * mat_column_from_vector(vertex);
+
+            return {abs_vec.at(0, 0), abs_vec.at(1, 0), abs_vec.at(2, 0)};
+        }
+
+        [[nodiscard]]
+        Triangle<Vector3<float>> make_face_in_world_space(const Vao::const_iterator vao_iterator) const
+        {
+            return {vertex_to_world_space(m_vertex_buffer.at(vao_iterator->x)),
+                    vertex_to_world_space(m_vertex_buffer.at(vao_iterator->y)),
+                    vertex_to_world_space(m_vertex_buffer.at(vao_iterator->z))};
+        }
+
+    private:
+        Vector3<NumericType> m_origin;
+        Vector3<NumericType> m_scale;
+
+        RotationAngles m_rotation_angles;
+
+        mutable std::optional<Mat4X4> m_to_world_matrix;
+    };
+} // namespace omath::primitives

include/omath/collision/gjk_algorithm.hpp

@@ -0,0 +1,49 @@
+//
+// Created by Vlad on 11/9/2025.
+//
+
+#pragma once
+#include "mesh_collider.hpp"
+#include "omath/linear_algebra/vector3.hpp"
+#include "simplex.hpp"
+
+namespace omath::collision
+{
+    template<class ColliderType>
+    class GjkAlgorithm final
+    {
+    public:
+        [[nodiscard]]
+        static ColliderType::VertexType find_support_vertex(const ColliderType& collider_a,
+                                                            const ColliderType& collider_b,
+                                                            const ColliderType::VertexType& direction)
+        {
+            return collider_a.find_abs_furthest_vertex(direction) - collider_b.find_abs_furthest_vertex(-direction);
+        }
+
+        [[nodiscard]]
+        static bool is_collide(const ColliderType& collider_a, const ColliderType& collider_b)
+        {
+            // Get initial support point in any direction
+            auto support = find_support_vertex(collider_a, collider_b, {1, 0, 0});
+
+            Simplex<typename ColliderType::VertexType> simplex;
+            simplex.push_front(support);
+
+            auto direction = -support;
+
+            while (true)
+            {
+                support = find_support_vertex(collider_a, collider_b, direction);
+
+                if (support.dot(direction) <= 0.f)
+                    return false;
+
+                simplex.push_front(support);
+
+                if (simplex.handle(direction))
+                    return true;
+            }
+        }
+    };
+} // namespace omath::collision

include/omath/collision/mesh_collider.hpp

@@ -0,0 +1,37 @@
+//
+// Created by Vlad on 11/9/2025.
+//
+
+#pragma once
+#include "omath/linear_algebra/vector3.hpp"
+
+namespace omath::collision
+{
+    template<class MeshType>
+    class MeshCollider
+    {
+    public:
+        using NumericType = typename MeshType::NumericType;
+
+        using VertexType = Vector3<NumericType>;
+        explicit MeshCollider(MeshType mesh): m_mesh(std::move(mesh))
+        {
+        }
+
+        [[nodiscard]]
+        const Vector3<float>& find_furthest_vertex(const Vector3<float>& direction) const
+        {
+            return *std::ranges::max_element(m_mesh.m_vertex_buffer, [&direction](const auto& first, const auto& second)
+                                             { return first.dot(direction) < second.dot(direction); });
+        }
+
+        [[nodiscard]]
+        Vector3<float> find_abs_furthest_vertex(const Vector3<float>& direction) const
+        {
+            return m_mesh.vertex_to_world_space(find_furthest_vertex(direction));
+        }
+
+    private:
+        MeshType m_mesh;
+    };
+} // namespace omath::collision

include/omath/collision/simplex.hpp

@@ -0,0 +1,257 @@
+#pragma once
+#include "omath/linear_algebra/vector3.hpp"
+#include <array>
+#include <cassert>
+#include <initializer_list>
+#include <type_traits>
+
+namespace omath::collision
+{
+
+    // Minimal structural contract for the vector type used by GJK.
+    template<class V>
+    concept GjkVector = requires(const V& a, const V& b) {
+        { -a } -> std::same_as<V>;
+        { a - b } -> std::same_as<V>;
+        { a.cross(b) } -> std::same_as<V>;
+        { a.point_to_same_direction(b) } -> std::same_as<bool>;
+    };
+
+    template<GjkVector VectorType = Vector3<float>>
+    class Simplex final
+    {
+        std::array<VectorType, 4> m_points{};
+        std::size_t m_size{0};
+
+    public:
+        static constexpr std::size_t capacity = 4;
+
+        constexpr Simplex() = default;
+
+        constexpr Simplex& operator=(std::initializer_list<VectorType> list) noexcept
+        {
+            assert(list.size() <= capacity && "Simplex can have at most 4 points");
+            m_size = 0;
+            for (const auto& p : list)
+                m_points[m_size++] = p;
+            return *this;
+        }
+
+        constexpr void push_front(const VectorType& p) noexcept
+        {
+            const std::size_t limit = (m_size < capacity) ? m_size : capacity - 1;
+            for (std::size_t i = limit; i > 0; --i)
+                m_points[i] = m_points[i - 1];
+            m_points[0] = p;
+            if (m_size < capacity)
+                ++m_size;
+        }
+
+        constexpr const VectorType& operator[](std::size_t i) const noexcept
+        {
+            return m_points[i];
+        }
+        constexpr VectorType& operator[](std::size_t i) noexcept
+        {
+            return m_points[i];
+        }
+
+        [[nodiscard]] constexpr std::size_t size() const noexcept
+        {
+            return m_size;
+        }
+
+        [[nodiscard]] constexpr bool empty() const noexcept
+        {
+            return m_size == 0;
+        }
+
+        [[nodiscard]] constexpr const VectorType& front() const noexcept
+        {
+            return m_points[0];
+        }
+
+        [[nodiscard]] constexpr const VectorType& back() const noexcept
+        {
+            return m_points[m_size - 1];
+        }
+
+        [[nodiscard]] constexpr const VectorType* data() const noexcept
+        {
+            return m_points.data();
+        }
+
+        [[nodiscard]] constexpr auto begin() const noexcept
+        {
+            return m_points.begin();
+        }
+
+        [[nodiscard]] constexpr auto end() const noexcept
+        {
+            return m_points.begin() + m_size;
+        }
+
+        constexpr void clear() noexcept
+        {
+            m_size = 0;
+        }
+
+        // GJK step: updates simplex + next search direction.
+        // Returns true iff the origin lies inside the tetrahedron.
+        [[nodiscard]] constexpr bool handle(VectorType& direction) noexcept
+        {
+            switch (m_size)
+            {
+            case 0:
+                return false;
+            case 1:
+                return handle_point(direction);
+            case 2:
+                return handle_line(direction);
+            case 3:
+                return handle_triangle(direction);
+            case 4:
+                return handle_tetrahedron(direction);
+            default:
+                std::unreachable();
+            }
+        }
+
+    private:
+        [[nodiscard]] constexpr bool handle_point(VectorType& direction) noexcept
+        {
+            const auto& a = m_points[0];
+            direction = -a;
+            return false;
+        }
+
+        template<class V>
+        static constexpr bool near_zero(const V& v, const float eps = 1e-7f)
+        {
+            return v.dot(v) <= eps * eps;
+        }
+
+        template<class V>
+        static constexpr V any_perp(const V& v)
+        {
+            // try cross with axes until non-zero
+            V d = v.cross(V{1, 0, 0});
+            if (near_zero(d))
+                d = v.cross(V{0, 1, 0});
+            if (near_zero(d))
+                d = v.cross(V{0, 0, 1});
+            return d;
+        }
+
+        constexpr bool handle_line(VectorType& direction)
+        {
+            const auto& a = m_points[0];
+            const auto& b = m_points[1];
+
+            const auto ab = b - a;
+            const auto ao = -a;
+
+            if (ab.point_to_same_direction(ao))
+            {
+                // ReSharper disable once CppTooWideScopeInitStatement
+                auto n = ab.cross(ao); // Needed to valid handle collision if colliders placed at same origin pos
+                if (near_zero(n))
+                {
+                    // collinear: origin lies on ray AB (often on segment), pick any perp to escape
+                    direction = any_perp(ab);
+                }
+                else
+                {
+                    direction = n.cross(ab);
+                }
+            }
+            else
+            {
+                *this = {a};
+                direction = ao;
+            }
+            return false;
+        }
+
+        [[nodiscard]] constexpr bool handle_triangle(VectorType& direction) noexcept
+        {
+            const auto& a = m_points[0];
+            const auto& b = m_points[1];
+            const auto& c = m_points[2];
+
+            const auto ab = b - a;
+            const auto ac = c - a;
+            const auto ao = -a;
+
+            const auto abc = ab.cross(ac);
+
+            // Region AC
+            if (abc.cross(ac).point_to_same_direction(ao))
+            {
+                if (ac.point_to_same_direction(ao))
+                {
+                    *this = {a, c};
+                    direction = ac.cross(ao).cross(ac);
+                    return false;
+                }
+                *this = {a, b};
+                return handle_line(direction);
+            }
+
+            // Region AB
+            if (ab.cross(abc).point_to_same_direction(ao))
+            {
+                *this = {a, b};
+                return handle_line(direction);
+            }
+
+            // Above or below triangle
+            if (abc.point_to_same_direction(ao))
+            {
+                direction = abc;
+            }
+            else
+            {
+                *this = {a, c, b}; // flip winding
+                direction = -abc;
+            }
+            return false;
+        }
+
+        [[nodiscard]] constexpr bool handle_tetrahedron(VectorType& direction) noexcept
+        {
+            const auto& a = m_points[0];
+            const auto& b = m_points[1];
+            const auto& c = m_points[2];
+            const auto& d = m_points[3];
+
+            const auto ab = b - a;
+            const auto ac = c - a;
+            const auto ad = d - a;
+            const auto ao = -a;
+
+            const auto abc = ab.cross(ac);
+            const auto acd = ac.cross(ad);
+            const auto adb = ad.cross(ab);
+
+            if (abc.point_to_same_direction(ao))
+            {
+                *this = {a, b, c};
+                return handle_triangle(direction);
+            }
+            if (acd.point_to_same_direction(ao))
+            {
+                *this = {a, c, d};
+                return handle_triangle(direction);
+            }
+            if (adb.point_to_same_direction(ao))
+            {
+                *this = {a, d, b};
+                return handle_triangle(direction);
+            }
+            // Origin inside tetrahedron
+            return true;
+        }
+    };
+
+} // namespace omath::collision

include/omath/engines/frostbite_engine/mesh.hpp

@@ -0,0 +1,12 @@
+//
+// Created by Vladislav on 09.11.2025.
+//
+#pragma once
+#include "constants.hpp"
+#include "omath/3d_primitives/mesh.hpp"
+#include "traits/mesh_trait.hpp"
+
+namespace omath::frostbite_engine
+{
+    using Mesh = primitives::Mesh<Mat4X4, ViewAngles, MeshTrait, float>;
+}

include/omath/engines/frostbite_engine/traits/mesh_trait.hpp

@@ -0,0 +1,19 @@
+//
+// Created by Vladislav on 09.11.2025.
+//
+#pragma once
+#include <omath/engines/frostbite_engine/constants.hpp>
+#include <omath/engines/frostbite_engine/formulas.hpp>
+
+namespace omath::frostbite_engine
+{
+    class MeshTrait final
+    {
+    public:
+        [[nodiscard]]
+        static Mat4X4 rotation_matrix(const ViewAngles& rotation)
+        {
+            return frostbite_engine::rotation_matrix(rotation);
+        }
+    };
+} // namespace omath::frostbite_engine

include/omath/engines/iw_engine/mesh.hpp

@@ -0,0 +1,12 @@
+//
+// Created by Vladislav on 09.11.2025.
+//
+#pragma once
+#include "constants.hpp"
+#include "omath/3d_primitives/mesh.hpp"
+#include "traits/mesh_trait.hpp"
+
+namespace omath::iw_engine
+{
+    using Mesh = primitives::Mesh<Mat4X4, ViewAngles, MeshTrait, float>;
+}

include/omath/engines/iw_engine/traits/mesh_trait.hpp

@@ -0,0 +1,19 @@
+//
+// Created by Vladislav on 09.11.2025.
+//
+#pragma once
+#include <omath/engines/iw_engine/constants.hpp>
+#include <omath/engines/iw_engine/formulas.hpp>
+
+namespace omath::iw_engine
+{
+    class MeshTrait final
+    {
+    public:
+        [[nodiscard]]
+        static Mat4X4 rotation_matrix(const ViewAngles& rotation)
+        {
+            return iw_engine::rotation_matrix(rotation);
+        }
+    };
+} // namespace omath::iw_engine

include/omath/engines/opengl_engine/mesh.hpp

@@ -0,0 +1,12 @@
+//
+// Created by Vladislav on 09.11.2025.
+//
+#pragma once
+#include "constants.hpp"
+#include "omath/3d_primitives/mesh.hpp"
+#include "traits/mesh_trait.hpp"
+
+namespace omath::opengl_engine
+{
+    using Mesh = primitives::Mesh<Mat4X4, ViewAngles, MeshTrait, float>;
+}

include/omath/engines/opengl_engine/traits/mesh_trait.hpp

@@ -0,0 +1,19 @@
+//
+// Created by Vladislav on 09.11.2025.
+//
+#pragma once
+#include <omath/engines/opengl_engine/constants.hpp>
+#include <omath/engines/opengl_engine/formulas.hpp>
+
+namespace omath::opengl_engine
+{
+    class MeshTrait final
+    {
+    public:
+        [[nodiscard]]
+        static Mat4X4 rotation_matrix(const ViewAngles& rotation)
+        {
+            return opengl_engine::rotation_matrix(rotation);
+        }
+    };
+} // namespace omath::opengl_engine

include/omath/engines/source_engine/collider.hpp

@@ -0,0 +1,13 @@
+//
+// Created by Vladislav on 09.11.2025.
+//
+
+#pragma once
+#include "mesh.hpp"
+#include "omath/3d_primitives/mesh.hpp"
+#include "omath/collision/mesh_collider.hpp"
+
+namespace omath::source_engine
+{
+    using MeshCollider = collision::MeshCollider<Mesh>;
+}

include/omath/engines/source_engine/mesh.hpp

@@ -0,0 +1,12 @@
+//
+// Created by Vladislav on 09.11.2025.
+//
+#pragma once
+#include "constants.hpp"
+#include "omath/3d_primitives/mesh.hpp"
+#include "traits/mesh_trait.hpp"
+
+namespace omath::source_engine
+{
+    using Mesh = primitives::Mesh<Mat4X4, ViewAngles, MeshTrait, float>;
+}

include/omath/engines/source_engine/traits/mesh_trait.hpp

@@ -0,0 +1,19 @@
+//
+// Created by Vladislav on 09.11.2025.
+//
+#pragma once
+#include <omath/engines/source_engine/constants.hpp>
+#include <omath/engines/source_engine/formulas.hpp>
+
+namespace omath::source_engine
+{
+    class MeshTrait final
+    {
+    public:
+        [[nodiscard]]
+        static Mat4X4 rotation_matrix(const ViewAngles& rotation)
+        {
+            return source_engine::rotation_matrix(rotation);
+        }
+    };
+} // namespace omath::source_engine

include/omath/engines/unity_engine/mesh.hpp

@@ -0,0 +1,12 @@
+//
+// Created by Vladislav on 09.11.2025.
+//
+#pragma once
+#include "constants.hpp"
+#include "omath/3d_primitives/mesh.hpp"
+#include "traits/mesh_trait.hpp"
+
+namespace omath::unity_engine
+{
+    using Mesh = primitives::Mesh<Mat4X4, ViewAngles, MeshTrait, float>;
+}

include/omath/engines/unity_engine/traits/mesh_trait.hpp

@@ -0,0 +1,19 @@
+//
+// Created by Vladislav on 09.11.2025.
+//
+#pragma once
+#include <omath/engines/unity_engine/constants.hpp>
+#include <omath/engines/unity_engine/formulas.hpp>
+
+namespace omath::unity_engine
+{
+    class MeshTrait final
+    {
+    public:
+        [[nodiscard]]
+        static Mat4X4 rotation_matrix(const ViewAngles& rotation)
+        {
+            return unity_engine::rotation_matrix(rotation);
+        }
+    };
+} // namespace omath::unity_engine

include/omath/engines/unreal_engine/mesh.hpp

@@ -0,0 +1,12 @@
+//
+// Created by Vladislav on 09.11.2025.
+//
+#pragma once
+#include "constants.hpp"
+#include "omath/3d_primitives/mesh.hpp"
+#include "traits/mesh_trait.hpp"
+
+namespace omath::unreal_engine
+{
+    using Mesh = primitives::Mesh<Mat4X4, ViewAngles, MeshTrait, float>;
+}

include/omath/engines/unreal_engine/traits/mesh_trait.hpp

@@ -0,0 +1,19 @@
+//
+// Created by Vladislav on 09.11.2025.
+//
+#pragma once
+#include <omath/engines/unreal_engine/constants.hpp>
+#include <omath/engines/unreal_engine/formulas.hpp>
+
+namespace omath::unreal_engine
+{
+    class MeshTrait final
+    {
+    public:
+        [[nodiscard]]
+        static Mat4X4 rotation_matrix(const ViewAngles& rotation)
+        {
+            return unreal_engine::rotation_matrix(rotation);
+        }
+    };
+} // namespace omath::unreal_engine

include/omath/linear_algebra/mat.hpp

@@ -586,6 +586,17 @@ namespace omath
                 {0, 0, 0, 1},
         };
     }
+    template<class Type = float, MatStoreType St = MatStoreType::ROW_MAJOR>
+    [[nodiscard]]
+    constexpr Mat<4, 4, Type, St> mat_scale(const Vector3<Type>& scale) noexcept
+    {
+        return {
+                {scale.x, 0, 0, 0},
+                {0, scale.y, 0, 0},
+                {0, 0, scale.z, 0},
+                {0, 0, 0, 1},
+        };
+    }
 
     template<class Type = float, MatStoreType St = MatStoreType::ROW_MAJOR, class Angle>
     [[nodiscard]]

include/omath/linear_algebra/vector3.hpp

@@ -216,6 +216,11 @@ namespace omath
             return sum_2d() + z;
         }
 
+        [[nodiscard]]
+        bool point_to_same_direction(const Vector3& other) const
+        {
+            return dot(other) > static_cast<Type>(0);
+        }
         [[nodiscard]] std::expected<Angle<float, 0.f, 180.f, AngleFlags::Clamped>, Vector3Error>
         angle_between(const Vector3& other) const noexcept
         {

include/omath/projection/camera.hpp

@@ -7,13 +7,17 @@
 #include "omath/linear_algebra/mat.hpp"
 #include "omath/linear_algebra/vector3.hpp"
 #include "omath/projection/error_codes.hpp"
-#include <omath/trigonometry/angle.hpp>
 #include <expected>
+#include <omath/trigonometry/angle.hpp>
 #include <type_traits>
 
 #ifdef OMATH_BUILD_TESTS
-// ReSharper disable once CppInconsistentNaming
+// ReSharper disable CppInconsistentNaming
 class UnitTestProjection_Projection_Test;
+class UnitTestProjection_ScreenToNdcTopLeft_Test;
+class UnitTestProjection_ScreenToNdcBottomLeft_Test;
+// ReSharper restore CppInconsistentNaming
+
 #endif
 
 namespace omath::projection
@@ -52,6 +56,8 @@ namespace omath::projection
     {
 #ifdef OMATH_BUILD_TESTS
         friend UnitTestProjection_Projection_Test;
+        friend UnitTestProjection_ScreenToNdcTopLeft_Test;
+        friend UnitTestProjection_ScreenToNdcBottomLeft_Test;
 #endif
     public:
         enum class ScreenStart
@@ -152,7 +158,6 @@ namespace omath::projection
             return m_origin;
         }
 
-
         template<ScreenStart screen_start = ScreenStart::TOP_LEFT_CORNER>
         [[nodiscard]] std::expected<Vector3<float>, Error>
         world_to_screen(const Vector3<float>& world_position) const noexcept
@@ -206,17 +211,19 @@ namespace omath::projection
                                   inverted_projection.at(2, 0)};
         }
 
+        template<ScreenStart screen_start = ScreenStart::TOP_LEFT_CORNER>
         [[nodiscard]]
         std::expected<Vector3<float>, Error> screen_to_world(const Vector3<float>& screen_pos) const noexcept
         {
-            return view_port_to_screen(screen_to_ndc(screen_pos));
+            return view_port_to_screen(screen_to_ndc<screen_start>(screen_pos));
         }
 
+        template<ScreenStart screen_start = ScreenStart::TOP_LEFT_CORNER>
         [[nodiscard]]
         std::expected<Vector3<float>, Error> screen_to_world(const Vector2<float>& screen_pos) const noexcept
         {
             const auto& [x, y] = screen_pos;
-            return screen_to_world({x, y, 1.f});
+            return screen_to_world<screen_start>({x, y, 1.f});
         }
 
     protected:
@@ -286,10 +293,17 @@ namespace omath::projection
             return {(ndc.x + 1.f) / 2.f * m_view_port.m_width, (ndc.y / 2.f + 0.5f) * m_view_port.m_height, ndc.z};
         }
 
+        template<ScreenStart screen_start = ScreenStart::TOP_LEFT_CORNER>
         [[nodiscard]] Vector3<float> screen_to_ndc(const Vector3<float>& screen_pos) const noexcept
         {
-            return {screen_pos.x / m_view_port.m_width * 2.f - 1.f, 1.f - screen_pos.y / m_view_port.m_height * 2.f,
+            if constexpr (screen_start == ScreenStart::TOP_LEFT_CORNER)
-                    screen_pos.z};
+                return {screen_pos.x / m_view_port.m_width * 2.f - 1.f, 1.f - screen_pos.y / m_view_port.m_height * 2.f,
+                        screen_pos.z};
+            else if (screen_start == ScreenStart::BOTTOM_LEFT_CORNER)
+                return {screen_pos.x / m_view_port.m_width * 2.f - 1.f,
+                        (screen_pos.y / m_view_port.m_height - 0.5f) * 2.f, screen_pos.z};
+            else
+                std::unreachable();
         }
     };
 } // namespace omath::projection

include/omath/rev_eng/internal_rev_object.hpp

@@ -23,27 +23,26 @@ namespace omath::rev_eng
             return *reinterpret_cast<Type*>(reinterpret_cast<std::uintptr_t>(this) + offset);
         }
 
-        template<std::size_t id, class ReturnType, class... Args>
+        template<std::size_t id, class ReturnType>
-        ReturnType call_virtual_method(Args&&... arg_list)
+        ReturnType call_virtual_method(auto... arg_list)
         {
 #ifdef _MSC_VER
             using VirtualMethodType = ReturnType(__thiscall*)(void*, decltype(arg_list)...);
 #else
             using VirtualMethodType = ReturnType (*)(void*, decltype(arg_list)...);
 #endif
-            return (*reinterpret_cast<VirtualMethodType**>(this))[id](this, std::forward<Args>(arg_list)...);
+            return (*reinterpret_cast<VirtualMethodType**>(this))[id](this, arg_list...);
         }
-        template<std::size_t id, class ReturnType, class... Args>
+        template<std::size_t id, class ReturnType>
-        ReturnType call_virtual_method(Args&&... arg_list) const
+        ReturnType call_virtual_method(auto... arg_list) const
         {
-            using This = std::remove_cv_t<std::remove_pointer_t<decltype(this)>>;
 #ifdef _MSC_VER
-            using VirtualMethodType = ReturnType(__thiscall*)(const void*, decltype(arg_list)...);
+            using VirtualMethodType = ReturnType(__thiscall*)(void*, decltype(arg_list)...);
 #else
             using VirtualMethodType = ReturnType (*)(void*, decltype(arg_list)...);
 #endif
-            return (*reinterpret_cast<VirtualMethodType**>(const_cast<This*>(this)))[id](
+            return (*static_cast<VirtualMethodType**>((void*)(this)))[id](
-                    const_cast<void*>(static_cast<const void*>(this)), std::forward<Args>(arg_list)...);
+                    const_cast<void*>(static_cast<const void*>(this)), arg_list...);
         }
     };
 } // namespace omath::rev_eng

include/omath/utility/color.hpp

@@ -9,7 +9,7 @@
 
 namespace omath
 {
-    struct Hsv
+    struct Hsv final
     {
         float hue{};
         float saturation{};

tests/general/unit_test_colider.cpp

@@ -0,0 +1,28 @@
+//
+// Created by Vlad on 11/9/2025.
+//
+#include "omath/engines/source_engine/collider.hpp"
+#include <gtest/gtest.h>
+#include <omath/collision/mesh_collider.hpp>
+
+TEST(UnitTestColider, CheckToWorld)
+{
+    omath::source_engine::Mesh mesh = {std::vector<omath::Vector3<float>>{{1.f, 1.f, 1.f}, {-1.f, -1.f, -1.f}}, {}};
+    mesh.set_origin({0, 2, 0});
+    const omath::source_engine::MeshCollider collider(mesh);
+
+    const auto vertex = collider.find_abs_furthest_vertex({1.f, 0.f, 0.f});
+
+    EXPECT_EQ(vertex, omath::Vector3<float>(1.f, 3.f, 1.f));
+}
+
+TEST(UnitTestColider, FindFurthestVertex)
+{
+    const omath::source_engine::Mesh mesh = {{{1.f, 1.f, 1.f}, {-1.f, -1.f, -1.f}}, {}};
+    const omath::source_engine::MeshCollider collider(mesh);
+    const auto vertex = collider.find_furthest_vertex({1.f, 0.f, 0.f});
+    EXPECT_EQ(vertex, omath::Vector3<float>(1.f, 1.f, 1.f));
+}
+
+
+

tests/general/unit_test_gjk.cpp

@@ -0,0 +1,58 @@
+//
+// Created by Vlad on 11/9/2025.
+//
+#include "omath/engines/source_engine/collider.hpp"
+#include <gtest/gtest.h>
+#include <omath/collision/gjk_algorithm.hpp>
+#include <omath/engines/source_engine/mesh.hpp>
+namespace
+{
+    const omath::source_engine::Mesh mesh = {
+            {{-1.f, -1.f, -1.f},
+             {-1.f, -1.f, 1.f},
+             {-1.f, 1.f, -1.f},
+             {-1.f, 1.f, 1.f},
+             {1.f, 1.f, 1.f},
+             {1.f, 1.f, -1.f},
+             {1.f, -1.f, 1.f},
+             {1.f, -1.f, -1.f}},
+            {}};
+}
+TEST(UnitTestGjk, TestCollisionTrue)
+{
+    const omath::source_engine::MeshCollider collider_a(mesh);
+
+    auto mesh_b = mesh;
+    mesh_b.set_origin({0.f, 0.5f, 0.f});
+
+    const omath::source_engine::MeshCollider collider_b(mesh_b);
+
+    using GjkAlgorithm = omath::collision::GjkAlgorithm<omath::source_engine::MeshCollider>;
+
+    const auto result = GjkAlgorithm::is_collide(collider_a, collider_b);
+
+    EXPECT_TRUE(result);
+}
+TEST(UnitTestGjk, TestCollisionFalse)
+{
+    const omath::source_engine::MeshCollider collider_a(mesh);
+    auto mesh_b = mesh;
+    mesh_b.set_origin({0.f, 2.1f, 0.f});
+    const omath::source_engine::MeshCollider collider_b(mesh_b);
+
+    const auto result =
+            omath::collision::GjkAlgorithm<omath::source_engine::MeshCollider>::is_collide(collider_a, collider_b);
+
+    EXPECT_FALSE(result);
+}
+
+TEST(UnitTestGjk, TestCollisionEqualOrigin)
+{
+    const omath::source_engine::MeshCollider collider_a(mesh);
+    const omath::source_engine::MeshCollider collider_b(mesh);
+
+    const auto result =
+            omath::collision::GjkAlgorithm<omath::source_engine::MeshCollider>::is_collide(collider_a, collider_b);
+
+    EXPECT_TRUE(result);
+}

tests/general/unit_test_projection.cpp

@@ -1,11 +1,13 @@
 //
 // Created by Vlad on 27.08.2024.
 //
+#include "omath/engines/unity_engine/camera.hpp"
 #include <complex>
 #include <gtest/gtest.h>
 #include <omath/engines/source_engine/camera.hpp>
 #include <omath/projection/camera.hpp>
 #include <print>
+#include <random>
 
 TEST(UnitTestProjection, Projection)
 {
@@ -22,4 +24,76 @@ TEST(UnitTestProjection, Projection)
     EXPECT_NEAR(projected->x, 960.f, 0.001f);
     EXPECT_NEAR(projected->y, 504.f, 0.001f);
     EXPECT_NEAR(projected->z, 1.f, 0.001f);
+}
+TEST(UnitTestProjection, ScreenToNdcTopLeft)
+{
+    constexpr auto fov = omath::Angle<float, 0.f, 180.f, omath::AngleFlags::Clamped>::from_degrees(90.f);
+    const auto cam = omath::source_engine::Camera({0, 0, 0}, omath::source_engine::ViewAngles{}, {1920.f, 1080.f}, fov,
+                                                  0.01f, 1000.f);
+    using ScreenStart = omath::source_engine::Camera::ScreenStart;
+
+    const auto ndc_top_left = cam.screen_to_ndc<ScreenStart::TOP_LEFT_CORNER>({1500, 300, 1.f});
+    EXPECT_NEAR(ndc_top_left.x, 0.5625f, 0.0001f);
+    EXPECT_NEAR(ndc_top_left.y, 0.4444f, 0.0001f);
+}
+
+TEST(UnitTestProjection, ScreenToNdcBottomLeft)
+{
+    constexpr auto fov = omath::projection::FieldOfView::from_degrees(60.f);
+
+    const auto cam = omath::unity_engine::Camera({0, 0, 0}, {}, {1280.f, 720.f}, fov, 0.03f, 1000.f);
+    using ScreenStart = omath::unity_engine::Camera::ScreenStart;
+
+    const auto ndc_bottom_left =
+            cam.screen_to_ndc<ScreenStart::BOTTOM_LEFT_CORNER>({1263.53833f, 547.061523f, 0.99405992f});
+    EXPECT_NEAR(ndc_bottom_left.x, 0.974278628f, 0.0001f);
+    EXPECT_NEAR(ndc_bottom_left.y, 0.519615293f, 0.0001f);
+}
+
+TEST(UnitTestProjection, ScreenToWorldTopLeftCorner)
+{
+    std::mt19937 gen(std::random_device{}()); // Seed with a non-deterministic source
+
+    std::uniform_real_distribution dist_x(1.f, 1900.f);
+    std::uniform_real_distribution dist_y(1.f, 1070.f);
+
+    constexpr auto fov = omath::Angle<float, 0.f, 180.f, omath::AngleFlags::Clamped>::from_degrees(90.f);
+    const auto cam = omath::source_engine::Camera({0, 0, 0}, omath::source_engine::ViewAngles{}, {1920.f, 1080.f}, fov,
+                                                  0.01f, 1000.f);
+    using ScreenStart = omath::source_engine::Camera::ScreenStart;
+
+    for (int i = 0; i < 100; i++)
+    {
+        const auto initial_screen_cords = omath::Vector2{dist_x(gen), dist_y(gen)};
+
+        const auto world_cords = cam.screen_to_world<ScreenStart::TOP_LEFT_CORNER>(initial_screen_cords);
+        const auto screen_cords = cam.world_to_screen<ScreenStart::TOP_LEFT_CORNER>(world_cords.value());
+
+        EXPECT_NEAR(screen_cords->x, initial_screen_cords.x, 0.001f);
+        EXPECT_NEAR(screen_cords->y, initial_screen_cords.y, 0.001f);
+    }
+}
+
+TEST(UnitTestProjection, ScreenToWorldBottomLeftCorner)
+{
+    std::mt19937 gen(std::random_device{}()); // Seed with a non-deterministic source
+
+    std::uniform_real_distribution dist_x(1.f, 1900.f);
+    std::uniform_real_distribution dist_y(1.f, 1070.f);
+
+    constexpr auto fov = omath::Angle<float, 0.f, 180.f, omath::AngleFlags::Clamped>::from_degrees(90.f);
+    const auto cam = omath::source_engine::Camera({0, 0, 0}, omath::source_engine::ViewAngles{}, {1920.f, 1080.f}, fov,
+                                                  0.01f, 1000.f);
+    using ScreenStart = omath::source_engine::Camera::ScreenStart;
+
+    for (int i = 0; i < 100; i++)
+    {
+        const auto initial_screen_cords = omath::Vector2{dist_x(gen), dist_y(gen)};
+
+        const auto world_cords = cam.screen_to_world<ScreenStart::BOTTOM_LEFT_CORNER>(initial_screen_cords);
+        const auto screen_cords = cam.world_to_screen<ScreenStart::BOTTOM_LEFT_CORNER>(world_cords.value());
+
+        EXPECT_NEAR(screen_cords->x, initial_screen_cords.x, 0.001f);
+        EXPECT_NEAR(screen_cords->y, initial_screen_cords.y, 0.001f);
+    }
 }