I don’t see any obvious issues in the first code snippet you posted.
I also tried adding in meshopt_generateShadowIndexBuffer() with a separate index buffer destination after meshopt_remapVertexBuffer(), but that yielded similar garbage results. Simplified.resize(meshopt_simplifySloppy(&simplified, indices.data(), index_count, (const float* _restrict)&vertices, vertices.size(), sizeof(vcg::Point3f), target_count)) Simplified.resize(meshopt_simplify(&simplified, indices.data(), index_count, (const float* _restrict)&vertices, vertices.size(), sizeof(vcg::Point3f), target_count, target_error)) Meshopt_remapVertexBuffer(&vertices, &unindexed_vertices, vertex_count_input, sizeof(vcg::Point3f), &remap) Meshopt_remapIndexBuffer(&indices, NULL, index_count, &remap) Size_t vertex_count = meshopt_generateVertexRemap(&remap, NULL, index_count, &unindexed_vertices, vertex_count_input, sizeof(vcg::Point3f)) Std::vector remap(index_count) // allocate temporary memory for the remap table Perhaps this is just the nature of decimation?Ĭonst size_t vertex_count_input = input.VN() Is this the correct approach? Am I doing something wrong? The result looks reasonable, but not entirely correct. I compute the offset/index from these pointers by subtracting the start of the vertex array (root). The VCG mesh has a vector of vertices, each represented by a Point3f type (the internal data of which is 3 floats - X, Y, and Z). Are the indexes here referring to triplets of offsets from Vertex_Ptr* + 0 which represent each face/triangle? I'm a little confused by the concept of "Index" in this mesh processing library. Simplified.resize(meshopt_simplifySloppy(&simplified, remap.data(), index_count, (const float* _restrict)&vertices, vertices.size(), sizeof(vcg::Point3f), target_count)) Simplified.resize(meshopt_simplify(&simplified, remap.data(), index_count, (const float* _restrict)&vertices, vertices.size(), sizeof(vcg::Point3f), target_count, target_error)) Size_t target_count = simplification_factor * index_count Remap.emplace_back(unsigned((MeshVert*)(f.cV(2)) - (MeshVert*)root)) Remap.emplace_back(unsigned((MeshVert*)(f.cV(1)) - (MeshVert*)root)) Remap.emplace_back(unsigned((MeshVert*)(f.cV(0)) - (MeshVert*)root))
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