private static VrmLib.BufferAccessor ToBufferAccessor <T>(T[] value, VrmLib.AccessorValueType valueType, VrmLib.AccessorVectorType vectorType) where T : struct { var span = SpanLike.CopyFrom(value); return(new VrmLib.BufferAccessor( span.Bytes, valueType, vectorType, value.Length )); }
/// <summary> /// https://github.com/vrm-c/UniVRM/issues/800 /// /// SubMesh 単位に分割する。 /// SubMesh を Gltf の Primitive に対応させる。 /// </summary> /// <param name="mesh"></param> /// <param name="materials"></param> /// <param name="storage"></param> /// <param name="gltfMesh"></param> /// <param name="option"></param> static IEnumerable <glTFPrimitives> ExportMeshDivided(this VrmLib.Mesh mesh, List <object> materials, Vrm10Storage storage, ExportArgs option) { var bufferIndex = 0; var usedIndices = new List <int>(); var meshIndices = SpanLike.CopyFrom(mesh.IndexBuffer.GetAsIntArray()); var positions = mesh.VertexBuffer.Positions.GetSpan <UnityEngine.Vector3>().ToArray(); var normals = mesh.VertexBuffer.Normals.GetSpan <UnityEngine.Vector3>().ToArray(); var uv = mesh.VertexBuffer.TexCoords.GetSpan <UnityEngine.Vector2>().ToArray(); var hasSkin = mesh.VertexBuffer.Weights != null; var weights = mesh.VertexBuffer.Weights?.GetSpan <UnityEngine.Vector4>().ToArray(); var joints = mesh.VertexBuffer.Joints?.GetSpan <SkinJoints>().ToArray(); Func <int, int> getJointIndex = default; if (hasSkin) { getJointIndex = i => { return(i); }; } foreach (var submesh in mesh.Submeshes) { var indices = meshIndices.Slice(submesh.Offset, submesh.DrawCount).ToArray(); var hash = new HashSet <int>(indices); // mesh // index の順に attributes を蓄える var buffer = new MeshExportUtil.VertexBuffer(indices.Length, getJointIndex); usedIndices.Clear(); for (int k = 0; k < positions.Length; ++k) { if (hash.Contains(k)) { // indices から参照される頂点だけを蓄える usedIndices.Add(k); buffer.Push(k, positions[k], normals[k], uv[k]); if (getJointIndex != null) { var j = joints[k]; var w = weights[k]; var boneWeight = new UnityEngine.BoneWeight { boneIndex0 = j.Joint0, boneIndex1 = j.Joint1, boneIndex2 = j.Joint2, boneIndex3 = j.Joint3, weight0 = w.x, weight1 = w.y, weight2 = w.z, weight3 = w.w, }; buffer.Push(boneWeight); } } } var materialIndex = submesh.Material; var gltfPrimitive = buffer.ToGltfPrimitive(storage.Gltf, bufferIndex, materialIndex, indices); // blendShape for (int j = 0; j < mesh.MorphTargets.Count; ++j) { var blendShape = new MeshExportUtil.BlendShapeBuffer(indices.Length); // index の順に attributes を蓄える var morph = mesh.MorphTargets[j]; var blendShapePositions = morph.VertexBuffer.Positions.GetSpan <UnityEngine.Vector3>(); SpanLike <UnityEngine.Vector3>?blendShapeNormals = default; if (morph.VertexBuffer.Normals != null) { blendShapeNormals = morph.VertexBuffer.Normals.GetSpan <UnityEngine.Vector3>(); } foreach (var k in usedIndices) { blendShape.Push( blendShapePositions[k], blendShapeNormals.HasValue ? blendShapeNormals.Value[k] : UnityEngine.Vector3.zero ); } gltfPrimitive.targets.Add(blendShape.ToGltf(storage.Gltf, bufferIndex, !option.removeMorphNormal)); } yield return(gltfPrimitive); } }