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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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26
src/pipeline/m2_loader.cpp
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@ -730,6 +730,32 @@ M2Model M2Loader::load(const std::vector<uint8_t>& m2Data) {
core::Logger::getInstance().debug(" Particle emitters: ", model.particleEmitters.size());
}
// Read collision mesh (bounding triangles/vertices/normals)
if (header.nBoundingVertices > 0 && header.ofsBoundingVertices > 0) {
struct Vec3Disk { float x, y, z; };
auto diskVerts = readArray<Vec3Disk>(m2Data, header.ofsBoundingVertices, header.nBoundingVertices);
model.collisionVertices.reserve(diskVerts.size());
for (const auto& v : diskVerts) {
model.collisionVertices.emplace_back(v.x, v.y, v.z);
}
}
if (header.nBoundingTriangles > 0 && header.ofsBoundingTriangles > 0) {
model.collisionIndices = readArray<uint16_t>(m2Data, header.ofsBoundingTriangles, header.nBoundingTriangles);
}
if (header.nBoundingNormals > 0 && header.ofsBoundingNormals > 0) {
struct Vec4Disk { float x, y, z, w; };
auto diskNormals = readArray<Vec4Disk>(m2Data, header.ofsBoundingNormals, header.nBoundingNormals);
model.collisionNormals.reserve(diskNormals.size());
for (const auto& n : diskNormals) {
model.collisionNormals.emplace_back(n.x, n.y, n.z, n.w);
}
}
if (!model.collisionVertices.empty()) {
core::Logger::getInstance().debug(" Collision mesh: ", model.collisionVertices.size(),
" verts, ", model.collisionIndices.size() / 3, " tris, ",
model.collisionNormals.size(), " normals");
}
static int m2LoadLogBudget = 200;
if (m2LoadLogBudget-- > 0) {
core::Logger::getInstance().debug("M2 model loaded: ", model.name);