static gltfMorphTarget ExportMorphTarget(glTF gltf, int bufferIndex, Mesh mesh, int j, bool useSparseAccessorForMorphTarget, bool exportOnlyBlendShapePosition) { var blendShapeVertices = mesh.vertices; var usePosition = blendShapeVertices != null && blendShapeVertices.Length > 0; var blendShapeNormals = mesh.normals; var useNormal = usePosition && blendShapeNormals != null && blendShapeNormals.Length == blendShapeVertices.Length; // var useNormal = usePosition && blendShapeNormals != null && blendShapeNormals.Length == blendShapeVertices.Length && !exportOnlyBlendShapePosition; var blendShapeTangents = mesh.tangents.Select(y => (Vector3)y).ToArray(); //var useTangent = usePosition && blendShapeTangents != null && blendShapeTangents.Length == blendShapeVertices.Length; var useTangent = false; var frameCount = mesh.GetBlendShapeFrameCount(j); mesh.GetBlendShapeFrameVertices(j, frameCount - 1, blendShapeVertices, blendShapeNormals, null); var blendShapePositionAccessorIndex = -1; var blendShapeNormalAccessorIndex = -1; var blendShapeTangentAccessorIndex = -1; if (useSparseAccessorForMorphTarget) { var accessorCount = blendShapeVertices.Length; var sparseIndices = Enumerable.Range(0, blendShapeVertices.Length) .Where(x => UseSparse( usePosition, blendShapeVertices[x], useNormal, blendShapeNormals[x], useTangent, blendShapeTangents[x])) .ToArray() ; if (sparseIndices.Length == 0) { usePosition = false; useNormal = false; useTangent = false; } else { Debug.LogFormat("Sparse {0}/{1}", sparseIndices.Length, mesh.vertexCount); } /* * var vertexSize = 12; * if (useNormal) vertexSize += 12; * if (useTangent) vertexSize += 24; * var sparseBytes = (4 + vertexSize) * sparseIndices.Length; * var fullBytes = (vertexSize) * blendShapeVertices.Length; * Debug.LogFormat("Export sparse: {0}/{1}bytes({2}%)", * sparseBytes, fullBytes, (int)((float)sparseBytes / fullBytes) * ); */ var sparseIndicesViewIndex = -1; if (usePosition) { sparseIndicesViewIndex = gltf.ExtendBufferAndGetViewIndex(bufferIndex, sparseIndices); blendShapeVertices = sparseIndices.Select(x => blendShapeVertices[x].ReverseZ()).ToArray(); blendShapePositionAccessorIndex = gltf.ExtendSparseBufferAndGetAccessorIndex(bufferIndex, accessorCount, blendShapeVertices, sparseIndices, sparseIndicesViewIndex, glBufferTarget.NONE); } if (useNormal) { blendShapeNormals = sparseIndices.Select(x => blendShapeNormals[x].ReverseZ()).ToArray(); blendShapeNormalAccessorIndex = gltf.ExtendSparseBufferAndGetAccessorIndex(bufferIndex, accessorCount, blendShapeNormals, sparseIndices, sparseIndicesViewIndex, glBufferTarget.NONE); } if (useTangent) { blendShapeTangents = sparseIndices.Select(x => blendShapeTangents[x].ReverseZ()).ToArray(); blendShapeTangentAccessorIndex = gltf.ExtendSparseBufferAndGetAccessorIndex(bufferIndex, accessorCount, blendShapeTangents, sparseIndices, sparseIndicesViewIndex, glBufferTarget.NONE); } } else { for (int i = 0; i < blendShapeVertices.Length; ++i) { blendShapeVertices[i] = blendShapeVertices[i].ReverseZ(); } if (usePosition) { blendShapePositionAccessorIndex = gltf.ExtendBufferAndGetAccessorIndex(bufferIndex, blendShapeVertices, glBufferTarget.ARRAY_BUFFER); } if (useNormal) { for (int i = 0; i < blendShapeNormals.Length; ++i) { blendShapeNormals[i] = blendShapeNormals[i].ReverseZ(); } blendShapeNormalAccessorIndex = gltf.ExtendBufferAndGetAccessorIndex(bufferIndex, blendShapeNormals, glBufferTarget.ARRAY_BUFFER); } if (useTangent) { for (int i = 0; i < blendShapeTangents.Length; ++i) { blendShapeTangents[i] = blendShapeTangents[i].ReverseZ(); } blendShapeTangentAccessorIndex = gltf.ExtendBufferAndGetAccessorIndex(bufferIndex, blendShapeTangents, glBufferTarget.ARRAY_BUFFER); } } if (blendShapePositionAccessorIndex != -1) { gltf.accessors[blendShapePositionAccessorIndex].min = blendShapeVertices.Aggregate(blendShapeVertices[0], (a, b) => new Vector3(Mathf.Min(a.x, b.x), Math.Min(a.y, b.y), Mathf.Min(a.z, b.z))).ToArray(); gltf.accessors[blendShapePositionAccessorIndex].max = blendShapeVertices.Aggregate(blendShapeVertices[0], (a, b) => new Vector3(Mathf.Max(a.x, b.x), Math.Max(a.y, b.y), Mathf.Max(a.z, b.z))).ToArray(); } return(new gltfMorphTarget { POSITION = blendShapePositionAccessorIndex, NORMAL = blendShapeNormalAccessorIndex, TANGENT = blendShapeTangentAccessorIndex, }); }