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improved mesh class

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This commit is contained in:
Orange
2025-11-29 16:28:06 +03:00
parent b98093b244
commit ba267cbcb8
10 changed files with 120 additions and 63 deletions
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40
include/omath/3d_primitives/mesh.hpp
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@@ -6,25 +6,44 @@
#include <omath/linear_algebra/mat.hpp>
#include <omath/linear_algebra/vector3.hpp>
#include <utility>
#include <variant>
#include <vector>
namespace omath::primitives
{
template<class Mat4X4, class RotationAngles, class MeshTypeTrait, class Type = float>
struct Vertex
{
using VectorType = Vector3<float>;
Vector3<float> position;
Vector3<float> normal;
Vector3<float> uv;
};
template<typename T> concept HasPosition = requires(T vertex) { vertex.position; };
template<typename T> concept HasNormal = requires(T vertex) { vertex.normal; };
template<typename T> concept HasUv = requires(T vertex) { vertex.uv; };
template<class Mat4X4, class RotationAngles, class MeshTypeTrait, class VertType = Vertex>
class Mesh final
{
public:
using NumericType = Type;
using NumericType = float;
using VertexType = Vertex;
private:
using Vbo = std::vector<Vector3<NumericType>>;
using Vbo = std::vector<VertexType>;
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,})
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(std::move(scale))
{
}
@@ -76,19 +95,20 @@ namespace omath::primitives
}
[[nodiscard]]
Vector3<float> vertex_to_world_space(const Vector3<float>& vertex) const
Vector3<float> vertex_to_world_space(const Vector3<float>& vertex_position) const
{
auto abs_vec = get_to_world_matrix() * mat_column_from_vector(vertex);
auto abs_vec = get_to_world_matrix() * mat_column_from_vector(vertex_position);
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
requires HasPosition<VertexType>
{
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))};
return {vertex_to_world_space(m_vertex_buffer.at(vao_iterator->x).position),
vertex_to_world_space(m_vertex_buffer.at(vao_iterator->y).position),
vertex_to_world_space(m_vertex_buffer.at(vao_iterator->z).position)};
}
private:

32
include/omath/collision/epa_algorithm.hpp
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@@ -24,13 +24,13 @@ namespace omath::collision
class Epa final
{
public:
using Vertex = typename ColliderType::VertexType;
static_assert(EpaVector<Vertex>, "VertexType must satisfy EpaVector concept");
using VectorType = typename ColliderType::VectorType;
static_assert(EpaVector<VectorType>, "VertexType must satisfy EpaVector concept");
struct Result final
{
Vertex normal{}; // outward normal (from B to A)
Vertex penetration_vector;
VectorType normal{}; // outward normal (from B to A)
VectorType penetration_vector;
float depth{0.0f};
int iterations{0};
int num_vertices{0};
@@ -45,11 +45,11 @@ namespace omath::collision
// Precondition: simplex.size()==4 and contains the origin.
[[nodiscard]]
static std::optional<Result> solve(const ColliderType& a, const ColliderType& b, const Simplex<Vertex>& simplex,
static std::optional<Result> solve(const ColliderType& a, const ColliderType& b, const Simplex<VectorType>& simplex,
const Params params = {})
{
// --- Build initial polytope from simplex (4 points) ---
std::vector<Vertex> vertexes;
std::vector<VectorType> vertexes;
vertexes.reserve(64);
for (std::size_t i = 0; i < simplex.size(); ++i)
vertexes.push_back(simplex[i]);
@@ -84,7 +84,7 @@ namespace omath::collision
const Face f = faces[fidx];
// Get farthest point in face normal direction
const Vertex p = support_point(a, b, f.n);
const VectorType p = support_point(a, b, f.n);
const float p_dist = f.n.dot(p);
// Converged if we can’t push the face closer than tolerance
@@ -172,7 +172,7 @@ namespace omath::collision
struct Face final
{
int i0, i1, i2;
Vertex n; // unit outward normal
VectorType n; // unit outward normal
float d; // n · v0 (>=0 ideally because origin is inside)
};
@@ -205,7 +205,7 @@ namespace omath::collision
}
[[nodiscard]]
static bool visible_from(const Face& f, const Vertex& p)
static bool visible_from(const Face& f, const VectorType& p)
{
// positive if p is in front of the face
return (f.n.dot(p) - f.d) > 1e-7f;
@@ -223,12 +223,12 @@ namespace omath::collision
}
[[nodiscard]]
static Face make_face(const std::vector<Vertex>& vertexes, int i0, int i1, int i2)
static Face make_face(const std::vector<VectorType>& vertexes, int i0, int i1, int i2)
{
const Vertex& a0 = vertexes[i0];
const Vertex& a1 = vertexes[i1];
const Vertex& a2 = vertexes[i2];
Vertex n = (a1 - a0).cross(a2 - a0);
const VectorType& a0 = vertexes[i0];
const VectorType& a1 = vertexes[i1];
const VectorType& a2 = vertexes[i2];
VectorType n = (a1 - a0).cross(a2 - a0);
if (n.dot(n) <= 1e-30f)
{
n = any_perp_vec(a1 - a0); // degenerate guard
@@ -246,9 +246,9 @@ namespace omath::collision
}
[[nodiscard]]
static Vertex support_point(const ColliderType& a, const ColliderType& b, const Vertex& dir)
static VectorType support_point(const ColliderType& a, const ColliderType& b, const VectorType& dir)
{
return a.find_abs_furthest_vertex(dir) - b.find_abs_furthest_vertex(-dir);
return a.find_abs_furthest_vertex(dir).position - b.find_abs_furthest_vertex(-dir).position;
}
template<class V>

16
include/omath/collision/gjk_algorithm.hpp
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@@ -17,14 +17,14 @@ namespace omath::collision
template<class ColliderType>
class GjkAlgorithm final
{
using VertexType = typename ColliderType::VertexType;
using VertexType = ColliderType::VertexType;
using VectorType = VertexType::VectorType;
public:
[[nodiscard]]
static VertexType find_support_vertex(const ColliderType& collider_a, const ColliderType& collider_b,
const VertexType& direction)
static VectorType find_support_vertex(const ColliderType& collider_a, const ColliderType& collider_b,
const VectorType& direction)
{
return collider_a.find_abs_furthest_vertex(direction) - collider_b.find_abs_furthest_vertex(-direction);
return collider_a.find_abs_furthest_vertex(direction).position - collider_b.find_abs_furthest_vertex(-direction).position;
}
[[nodiscard]]
@@ -34,12 +34,12 @@ namespace omath::collision
}
[[nodiscard]]
static GjkHitInfo<VertexType> is_collide_with_simplex_info(const ColliderType& collider_a,
static GjkHitInfo<VectorType> is_collide_with_simplex_info(const ColliderType& collider_a,
const ColliderType& collider_b)
{
auto support = find_support_vertex(collider_a, collider_b, {1, 0, 0});
auto support = find_support_vertex(collider_a, collider_b, VectorType{1, 0, 0});
Simplex<VertexType> simplex;
Simplex<VectorType> simplex;
simplex.push_front(support);
auto direction = -support;

22
include/omath/collision/mesh_collider.hpp
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@@ -11,31 +11,37 @@ namespace omath::collision
class MeshCollider
{
public:
using NumericType = typename MeshType::NumericType;
using NumericType = MeshType::NumericType;
using VertexType = Vector3<NumericType>;
using VertexType = MeshType::VertexType;
using VectorType = VertexType::VectorType;
explicit MeshCollider(MeshType mesh): m_mesh(std::move(mesh))
{
}
[[nodiscard]]
const VertexType& find_furthest_vertex(const VertexType& direction) const
const VertexType& find_furthest_vertex(const VectorType& 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); });
return *std::ranges::max_element(
m_mesh.m_vertex_buffer, [&direction](const auto& first, const auto& second)
{ return first.position.dot(direction) < second.position.dot(direction); });
}
[[nodiscard]]
VertexType find_abs_furthest_vertex(const VertexType& direction) const
VertexType find_abs_furthest_vertex(const VectorType& direction) const
{
return m_mesh.vertex_to_world_space(find_furthest_vertex(direction));
const auto& vertex = find_furthest_vertex(direction);
auto new_vertex = vertex;
new_vertex.position = m_mesh.vertex_to_world_space(find_furthest_vertex(direction).position);
return new_vertex;
}
[[nodiscard]]
const VertexType& get_origin() const
const VectorType& get_origin() const
{
return m_mesh.get_origin();
}
private:
MeshType m_mesh;
};

2
include/omath/engines/source_engine/mesh.hpp
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@@ -8,5 +8,5 @@
namespace omath::source_engine
{
using Mesh = primitives::Mesh<Mat4X4, ViewAngles, MeshTrait, float>;
using Mesh = primitives::Mesh<Mat4X4, ViewAngles, MeshTrait>;
}