public static void Weld(Mesh mesh)
{
var aOldVert = mesh.vertices;
var aOldNorm = mesh.normals;
var aOldColor = mesh.colors;
var aOldBoneWeight = mesh.boneWeights;
var aOldBindPose = mesh.bindposes;
var aOldEmissionHash = new List <Vector4>();
var aOldMetallicSmoothness = new List <Vector2>();
mesh.GetUVs(EmissionHashUvIndex, aOldEmissionHash);
mesh.GetUVs(MetallicSmoothnessUvIndex, aOldMetallicSmoothness);
var aOldIndex = mesh.GetIndices(0);
var vertToIndexMap = new Dictionary <int, int>();
var indexToIndexMap = new int[aOldVert.Length];
for (int i = 0; i < aOldIndex.Length; ++i)
{
int index = aOldIndex[i];
int key = Codec.Hash(Quantize(aOldVert[index], 1e-6f));
key = Codec.HashConcat(key, Quantize(aOldNorm[index], 1e-3f));
int newIndex = -1;
if (!vertToIndexMap.TryGetValue(key, out newIndex))
{
newIndex = vertToIndexMap.Count;
vertToIndexMap.Add(key, newIndex);
// debugger-friendly duplicate code
indexToIndexMap[i] = newIndex;
}
else
{
// debugger-friendly duplicate code
indexToIndexMap[i] = newIndex;
}
}
int numUniqueVerts = vertToIndexMap.Count;
var aNewVert = new Vector3[numUniqueVerts];
var aNewNorm = new Vector3[numUniqueVerts];
var aNewColor = new Color[numUniqueVerts];
var aNewEmissionHash = new Vector4[numUniqueVerts];
var aNewMetallicSmoothness = new Vector2[numUniqueVerts];
var aNewBoneWeight = new BoneWeight[numUniqueVerts];
var aNewBindPose = aOldBindPose; // bind poses aren't changed
for (int oldIndex = 0; oldIndex < indexToIndexMap.Length; ++oldIndex)
{
int newIndex = indexToIndexMap[oldIndex];
aNewVert[newIndex] = aOldVert[oldIndex];
aNewNorm[newIndex] = aOldNorm[oldIndex];
aNewColor[newIndex] = aOldColor[oldIndex];
aNewEmissionHash[newIndex] = aOldEmissionHash[oldIndex];
aNewMetallicSmoothness[newIndex] = aOldMetallicSmoothness[oldIndex];
if (aOldBoneWeight != null && aOldBoneWeight.Length >= aOldVert.Length)
{
aNewBoneWeight[newIndex] = aOldBoneWeight[oldIndex];
}
}
var aNewIndex = new int[aOldIndex.Length];
for (int i = 0; i < aOldIndex.Length; ++i)
{
aNewIndex[i] = indexToIndexMap[aOldIndex[i]];
}
var topology = mesh.GetTopology(0);
mesh.Clear();
mesh.SetVertices(aNewVert);
mesh.SetNormals(aNewNorm);
mesh.SetColors(aNewColor);
mesh.boneWeights = aNewBoneWeight;
mesh.bindposes = aNewBindPose;
mesh.SetUVs(EmissionHashUvIndex, aNewEmissionHash);
mesh.SetUVs(MetallicSmoothnessUvIndex, aNewMetallicSmoothness);
mesh.SetIndices(aNewIndex, topology, 0);
}