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Determine the original vertex index based on the position

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The Assimp library does not expose the FBX control point indices. This
change causes vertices that are close enough in their position to be
considered as coming from the same control point. This allows the mesh
optimizer to consider vertices with the same control point index (or
"original vertex index" as it is called in the code) for deduplication.

Signed-off-by: Chris Burel <burelc@amazon.com>
This commit is contained in:
Chris Burel
2021-06-24 10:32:04 -07:00
parent 6d563e2e19
commit e4e1946018
1 changed files with 21 additions and 3 deletions
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Gems/SceneProcessing/Code/Source/Generation/Components/MeshOptimizer/MeshOptimizerComponent.cpp
+21 -3
View File
@@ -107,7 +107,7 @@ namespace AZ::SceneGenerationComponents
auto* serializeContext = azrtti_cast<AZ::SerializeContext*>(context);
if (serializeContext)
{
serializeContext->Class<MeshOptimizerComponent, GenerationComponent>()->Version(2);
serializeContext->Class<MeshOptimizerComponent, GenerationComponent>()->Version(3);
}
}
@@ -434,6 +434,12 @@ namespace AZ::SceneGenerationComponents
const float weightThreshold = skinRule ? skinRule->GetWeightThreshold() : 0.001f;
meshBuilder.SetSkinningInfo(ExtractSkinningInfo(meshData, skinWeights, maxWeightsPerVertex, weightThreshold));
constexpr float positionTolerance = 0.0001f;
constexpr float positionToleranceReciprocal = 1.0f / positionTolerance;
AZStd::unordered_map<AZ::Vector3, AZ::u32> positionMap{};
AZ::u32 currentOriginalVertexIndex = 0;
// Add the vertex data to all the layers
const AZ::u32 faceCount = meshData->GetFaceCount();
for (AZ::u32 faceIndex = 0; faceIndex < faceCount; ++faceIndex)
@@ -441,8 +447,20 @@ namespace AZ::SceneGenerationComponents
meshBuilder.BeginPolygon(baseMesh->GetFaceMaterialId(faceIndex));
for (const AZ::u32 vertexIndex : meshData->GetFaceInfo(faceIndex).vertexIndex)
{
const int orgVertexNumber = meshData->GetUsedPointIndexForControlPoint(meshData->GetControlPointIndex(vertexIndex));
AZ_Assert(orgVertexNumber >= 0, "Invalid vertex number");
// Round the vertex position so that a float comparison can be made with entires in the positionMap
AZ::Vector3 position = meshData->GetPosition(vertexIndex);
position *= positionToleranceReciprocal;
position += AZ::Vector3(0.5f);
position = AZ::Vector3(AZ::Simd::Vec3::Floor(position.GetSimdValue()));
position *= positionTolerance;
const auto& [iter, didInsert] = positionMap.try_emplace(position, currentOriginalVertexIndex);
if (didInsert)
{
++currentOriginalVertexIndex;
}
const AZ::u32 orgVertexNumber = iter->second;
orgVtxLayer->SetCurrentVertexValue(orgVertexNumber);
posLayer->SetCurrentVertexValue(meshData->GetPosition(vertexIndex));