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Optimized SubMesh to hold only used vertices #84

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Bogdan Nagirniak merged 3 commits from BLEN-474 into hydra-render 2023-08-02 16:45:15 +02:00
Conversation 0 Commits 3 Files Changed 2 +40 -15
2 changed files with 40 additions and 15 deletions
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45
source/blender/io/usd/hydra/mesh.cc
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@ -82,9 +82,6 @@ void MeshData::update()
pxr::VtValue MeshData::get_data(pxr::TfToken const &key) const
{
if (key == pxr::HdTokens->points) {
return pxr::VtValue(vertices_);
}
return pxr::VtValue();
}
@ -93,9 +90,13 @@ pxr::VtValue MeshData::get_data(pxr::SdfPath const &id, pxr::TfToken const &key)
if (key == pxr::HdTokens->normals) {
return pxr::VtValue(submesh(id).normals);
}
else if (key == pxr::tokens_->st) {
if (key == pxr::tokens_->st) {
return pxr::VtValue(submesh(id).uvs);
}
if (key == pxr::HdTokens->points) {
return pxr::VtValue(submesh(id).vertices);
}
return get_data(key);
}
@ -131,10 +132,8 @@ pxr::HdPrimvarDescriptorVector MeshData::primvar_descriptors(
{
pxr::HdPrimvarDescriptorVector primvars;
if (interpolation == pxr::HdInterpolationVertex) {
if (!vertices_.empty()) {
primvars.emplace_back(pxr::HdTokens->points, interpolation, pxr::HdPrimvarRoleTokens->point);
}
}
else if (interpolation == pxr::HdInterpolationFaceVarying) {
if (!submeshes_[0].normals.empty()) {
primvars.emplace_back(
@ -214,7 +213,6 @@ const MeshData::SubMesh &MeshData::submesh(pxr::SdfPath const &id) const
void MeshData::write_submeshes(Mesh *mesh)
{
submeshes_.clear();
vertices_.clear();
/* Insert base submeshes */
int mat_count = BKE_object_material_count_eval((Object *)id);
@ -267,12 +265,39 @@ void MeshData::write_submeshes(Mesh *mesh)
}
}
if (!submeshes_.empty()) {
if (submeshes_.empty()) {
return;
}
/* vertices */
vertices_.reserve(mesh->totvert);
blender::Span<blender::float3> verts = mesh->vert_positions();
pxr::VtVec3fArray vertices(mesh->totvert);
int i = 0;
for (blender::float3 v : verts) {
vertices_.push_back(pxr::GfVec3f(v.x, v.y, v.z));
vertices[i++] = pxr::GfVec3f(v.x, v.y, v.z);
}
if (submeshes_.size() == 1) {
submeshes_[0].vertices = std::move(vertices);
}
else {
/* Optimizing submeshes: getting only used vertices, rearranged indices */
for (SubMesh &sm : submeshes_) {
Map<int, int> index_map;
Brecht Van Lommel commented 2023-08-02 13:20:09 +02:00
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I would guess something like this is more efficient, instead of multiple loops and hash maps.

Vector<int> index_map(vertices.size(), 0);
for (int& face_vertex_index : sm.face_vertex_indices) {
  const int v = face_vertex_index;
  if (index_map[v] == 0) {
    sm.vertices.append(vertices[v]);
    index_map[v] = sm.vertices.size();
  }
  face_vertex_index = index_map[v] - 1;
}
I would guess something like this is more efficient, instead of multiple loops and hash maps. ``` Vector<int> index_map(vertices.size(), 0); for (int& face_vertex_index : sm.face_vertex_indices) { const int v = face_vertex_index; if (index_map[v] == 0) { sm.vertices.append(vertices[v]); index_map[v] = sm.vertices.size(); } face_vertex_index = index_map[v] - 1; } ```
Bogdan Nagirniak commented 2023-08-02 14:18:46 +02:00
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You are right, your algorithm is more efficient and faster, thank you.

You are right, your algorithm is more efficient and faster, thank you.
for (int i : sm.face_vertex_indices) {
index_map.add(i, 0);
}
i = 0;
for (int &v : index_map.values()) {
v = i++;
}
sm.vertices.resize(index_map.size());
for (auto it : index_map.items()) {
sm.vertices[it.value] = vertices[it.key];
}
for (int &v : sm.face_vertex_indices) {
v = index_map.lookup(v);
}
}
}
}

2
source/blender/io/usd/hydra/mesh.h
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@ -17,6 +17,7 @@ namespace blender::io::hydra {
class MeshData : public ObjectData {
struct SubMesh {
pxr::VtVec3fArray vertices;
pxr::VtIntArray face_vertex_counts;
pxr::VtIntArray face_vertex_indices;
pxr::VtVec3fArray normals;
@ -26,7 +27,6 @@ class MeshData : public ObjectData {
};
private:
pxr::VtVec3fArray vertices_;
std::vector<SubMesh> submeshes_;
int submeshes_count_ = 0;