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split_on_materials.go
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/
split_on_materials.go
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package meshops
import (
"github.com/EliCDavis/polyform/modeling"
)
func SplitOnUniqueMaterials(m modeling.Mesh) []modeling.Mesh {
// No materials to split on, so nothing to do!
if len(m.Materials()) < 2 {
return []modeling.Mesh{m}
}
// Right now we only support triangle meshes
// (https://github.com/EliCDavis/polyform/issues/10)
err := RequireTopology(m, modeling.TriangleTopology)
if err != nil {
panic(err)
}
type workingMesh struct {
indices []int
material modeling.MeshMaterial
}
workingMeshes := make(map[*modeling.Material]*workingMesh)
orderInserted := make(map[*modeling.Material]int)
curMatIndex := 0
trisFromOtherMats := 0
originalMaterials := m.Materials()
workingMeshes[originalMaterials[curMatIndex].Material] = &workingMesh{
material: modeling.MeshMaterial{
PrimitiveCount: 0,
Material: originalMaterials[curMatIndex].Material,
},
indices: make([]int, 0),
}
orderInserted[originalMaterials[curMatIndex].Material] = 0
orinalIndices := m.Indices()
for triStart := 0; triStart < orinalIndices.Len(); triStart += 3 {
if originalMaterials[curMatIndex].PrimitiveCount+trisFromOtherMats <= triStart/3 {
trisFromOtherMats += originalMaterials[curMatIndex].PrimitiveCount
curMatIndex++
if _, ok := workingMeshes[originalMaterials[curMatIndex].Material]; !ok {
workingMeshes[originalMaterials[curMatIndex].Material] = &workingMesh{
material: modeling.MeshMaterial{
PrimitiveCount: 0,
Material: originalMaterials[curMatIndex].Material,
},
indices: make([]int, 0),
}
orderInserted[originalMaterials[curMatIndex].Material] = len(orderInserted)
}
}
mesh := workingMeshes[originalMaterials[curMatIndex].Material]
mesh.indices = append(
mesh.indices,
orinalIndices.At(triStart),
orinalIndices.At(triStart+1),
orinalIndices.At(triStart+2),
)
mesh.material.PrimitiveCount += 1
}
v4Data := readAllFloat4Data(m)
v3Data := readAllFloat3Data(m)
v2Data := readAllFloat2Data(m)
v1Data := readAllFloat1Data(m)
finalMeshes := make([]modeling.Mesh, len(workingMeshes))
for mat, workingMesh := range workingMeshes {
mesh := modeling.NewMesh(m.Topology(), workingMesh.indices).
SetFloat4Data(v4Data).
SetFloat3Data(v3Data).
SetFloat2Data(v2Data).
SetFloat1Data(v1Data).
SetMaterial(*mat)
finalMeshes[orderInserted[mat]] = RemovedUnreferencedVertices(mesh)
}
return finalMeshes
}