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Merge pull request #139 from orange-cpp/feature/mesh_line_tracer

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Feature/mesh line tracer
This commit is contained in:
Orange++
2026-01-27 01:42:41 +03:00
committed by GitHub
parent 8bccbdb620 bd1d437d7d
commit d5233dd00b
4 changed files with 37 additions and 8 deletions
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8
include/omath/3d_primitives/mesh.hpp
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@@ -101,7 +101,6 @@ namespace omath::primitives
[[nodiscard]]
VectorType vertex_position_to_world_space(const Vector3<float>& vertex_position) const
requires HasPosition<VertexType>
{
auto abs_vec = get_to_world_matrix()
* mat_column_from_vector<typename Mat4X4::ContainedType, Mat4X4::get_store_ordering()>(
@@ -112,12 +111,17 @@ namespace omath::primitives
[[nodiscard]]
Triangle<VectorType> make_face_in_world_space(const Ebo::const_iterator vao_iterator) const
requires HasPosition<VertexType>
{
if constexpr (HasPosition<VertexType>)
{
return {vertex_position_to_world_space(m_vertex_buffer.at(vao_iterator->x).position),
vertex_position_to_world_space(m_vertex_buffer.at(vao_iterator->y).position),
vertex_position_to_world_space(m_vertex_buffer.at(vao_iterator->z).position)};
}
return {vertex_position_to_world_space(m_vertex_buffer.at(vao_iterator->x)),
vertex_position_to_world_space(m_vertex_buffer.at(vao_iterator->y)),
vertex_position_to_world_space(m_vertex_buffer.at(vao_iterator->z))};
}
private:
VectorType m_origin;

20
include/omath/collision/line_tracer.hpp
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@@ -33,5 +33,25 @@ namespace omath::collision
// https://en.wikipedia.org/wiki/M%C3%B6ller%E2%80%93Trumbore_intersection_algorithm
[[nodiscard]]
static Vector3<float> get_ray_hit_point(const Ray& ray, const Triangle<Vector3<float>>& triangle) noexcept;
template<class MeshType>
[[nodiscard]]
static Vector3<float> get_ray_hit_point(const Ray& ray, const MeshType& mesh) noexcept
{
Vector3<float> mesh_hit = ray.end;
auto begin = mesh.m_element_buffer_object.cbegin();
auto end = mesh.m_element_buffer_object.cend();
for (auto current = begin; current < end; current = std::next(current))
{
auto face = mesh.make_face_in_world_space(current);
auto ray_stop_point = get_ray_hit_point(ray, face);
if (ray_stop_point.distance_to(ray.start) < mesh_hit.distance_to(ray.start))
mesh_hit = ray_stop_point;
}
return mesh_hit;
}
};
} // namespace omath::collision

8
tests/general/unit_test_primitive_box.cpp
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@@ -2,11 +2,15 @@
// Created by Vladislav on 11.01.2026.
//
#include "omath/3d_primitives/box.hpp"
#include "omath/collision/line_tracer.hpp"
#include "omath/engines/opengl_engine/primitives.hpp"
#include <gtest/gtest.h>
TEST(test, test)
{
auto result = omath::primitives::create_box<omath::opengl_engine::BoxMesh>({0.f, 30.f, 0.f}, {}, omath::opengl_engine::k_abs_forward,
omath::opengl_engine::k_abs_right);
auto result = omath::primitives::create_box<omath::opengl_engine::BoxMesh>(
{0.f, 30.f, 0.f}, {}, omath::opengl_engine::k_abs_forward, omath::opengl_engine::k_abs_right);
omath::collision::Ray ray{.start = {0, 0, 0}, .end = {-100, 0, 0}};
std::ignore = omath::collision::LineTracer::get_ray_hit_point(ray, result);
}

3
tests/main.cpp
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@@ -1,6 +1,7 @@
#include <gtest/gtest.h>
int main(int argc, char** argv) {
int main(int argc, char** argv)
{
testing::InitGoogleTest(&argc, argv);
return RUN_ALL_TESTS();