private int SortInMergedVertex(int posIndex, int normalIndex, int texCoordIndex, ref Face face)
{
var vertHash = Vertex.GetHashForIndices(posIndex, normalIndex, texCoordIndex);
if (VertexIndicesByHash.TryGetValue(vertHash, out var index))
{
return(index);
}
Vector3 tangent, bitangent;
MeshUtils.CalcTBNSpace(p0: Positions[face.V0],
uv0: TexCoords[face.V0t],
p1: Positions[face.V1],
uv1: TexCoords[face.V1t],
p2: Positions[face.V2],
uv2: TexCoords[face.V2t],
normal: Normals[normalIndex],
tangent: out tangent,
bitangent: out bitangent);
var newIndex = _distinctVertices.Count;
var vert = new Vertex(posIndex, normalIndex, texCoordIndex);
VertexIndicesByHash[vertHash] = newIndex;
VertexBinormals.Add(bitangent);
VertexTangents.Add(tangent);
_distinctVertices.Add(vert);
return(newIndex);
}
public int GetVertexIndex(int positionIndex, int normalIndex, int textureCoordsIndex)
{
var hash = Vertex.GetHashForIndices(positionIndex, normalIndex, textureCoordsIndex);
if (VertexIndicesByHash.TryGetValue(hash, out var index))
{
return(index);
}
return(-1);
}