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Add M2 collision mesh parsing and mesh-based wall/floor collision

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Parse bounding vertices, triangles, and normals from M2 files and use
them for proper triangle-level collision instead of AABB heuristics.
Spatial grid bucketing for efficient queries, closest-point wall push
with soft clamping, and ray-triangle floor detection alongside existing
AABB fallback.
This commit is contained in:
Kelsi 2026-02-08 19:56:17 -08:00
parent fc003a2aba
commit d7aabc0caa
4 changed files with 360 additions and 0 deletions
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25
include/rendering/m2_renderer.hpp
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@ -59,6 +59,30 @@ struct M2ModelGPU {
bool collisionNoBlock = false;
bool collisionStatue = false;
// Collision mesh with spatial grid (from M2 bounding geometry)
struct CollisionMesh {
std::vector<glm::vec3> vertices;
std::vector<uint16_t> indices;
uint32_t triCount = 0;
struct TriBounds { float minZ, maxZ; };
std::vector<TriBounds> triBounds;
static constexpr float CELL_SIZE = 4.0f;
glm::vec2 gridOrigin{0.0f};
int gridCellsX = 0, gridCellsY = 0;
std::vector<std::vector<uint32_t>> cellFloorTris;
std::vector<std::vector<uint32_t>> cellWallTris;
void build();
void getFloorTrisInRange(float minX, float minY, float maxX, float maxY,
std::vector<uint32_t>& out) const;
void getWallTrisInRange(float minX, float minY, float maxX, float maxY,
std::vector<uint32_t>& out) const;
bool valid() const { return triCount > 0; }
};
CollisionMesh collision;
std::string name;
// Skeletal animation data (kept from M2Model for bone computation)
@ -348,6 +372,7 @@ private:
std::unordered_map<uint32_t, size_t> instanceIndexById;
mutable std::vector<size_t> candidateScratch;
mutable std::unordered_set<uint32_t> candidateIdScratch;
mutable std::vector<uint32_t> collisionTriScratch_;
// Collision query profiling (per frame).
mutable double queryTimeMs = 0.0;