static void Vec3MinMax(Memory <byte> bytes, VrmProtobuf.Accessor accessor) { var positions = MemoryMarshal.Cast <byte, Vector3>(bytes.Span); var min = new Vector3(float.PositiveInfinity, float.PositiveInfinity, float.PositiveInfinity); var max = new Vector3(float.NegativeInfinity, float.NegativeInfinity, float.NegativeInfinity); foreach (var p in positions) { min = Vector3.Min(min, p); max = Vector3.Max(max, p); } accessor.Min.Add(min.X); accessor.Min.Add(min.Y); accessor.Min.Add(min.Z); accessor.Max.Add(max.X); accessor.Max.Add(max.Y); accessor.Max.Add(max.Z); }
public static int GetStride(this VrmProtobuf.Accessor accessor) { return(accessor.Type.TypeCount() * ((VrmLib.AccessorValueType)accessor.ComponentType).ByteSize()); }
public static int AddAccessorTo(this BufferAccessor self, Vrm10Storage storage, int bufferIndex, // GltfBufferTargetType targetType, bool useSparse, Action <Memory <byte>, VrmProtobuf.Accessor> minMax = null, int offset = 0, int count = 0) { if (self.ComponentType == AccessorValueType.FLOAT && self.AccessorType == AccessorVectorType.VEC3 ) { var values = self.GetSpan <Vector3>(); // 巨大ポリゴンのモデル対策にValueTupleの型をushort -> uint へ var sparseValuesWithIndex = new List <ValueTuple <int, Vector3> >(); for (int i = 0; i < values.Length; ++i) { var v = values[i]; if (v != Vector3.Zero) { sparseValuesWithIndex.Add((i, v)); } } //var status = $"{sparseIndices.Count * 14}/{values.Length * 12}"; if (useSparse && sparseValuesWithIndex.Count > 0 && // avoid empty sparse sparseValuesWithIndex.Count * 16 < values.Length * 12) { // use sparse var sparseIndexBin = new byte[sparseValuesWithIndex.Count * 4].AsMemory(); var sparseIndexSpan = MemoryMarshal.Cast <byte, int>(sparseIndexBin.Span); var sparseValueBin = new byte[sparseValuesWithIndex.Count * 12].AsMemory(); var sparseValueSpan = MemoryMarshal.Cast <byte, Vector3>(sparseValueBin.Span); for (int i = 0; i < sparseValuesWithIndex.Count; ++i) { var(index, value) = sparseValuesWithIndex[i]; sparseIndexSpan[i] = index; sparseValueSpan[i] = value; } var sparseIndexView = storage.AppendToBuffer(bufferIndex, sparseIndexBin, 4); var sparseValueView = storage.AppendToBuffer(bufferIndex, sparseValueBin, 12); var accessorIndex = storage.Gltf.Accessors.Count; var accessor = new VrmProtobuf.Accessor { ComponentType = (int)self.ComponentType, Type = EnumUtil.Cast <VrmProtobuf.Accessor.Types.accessorType>(self.AccessorType), Count = self.Count, Sparse = new VrmProtobuf.AccessorSparse { Count = sparseValuesWithIndex.Count, Indices = new VrmProtobuf.AccessorSparseIndices { ComponentType = (int)AccessorValueType.UNSIGNED_INT, BufferView = sparseIndexView, }, Values = new VrmProtobuf.AccessorSparseValues { BufferView = sparseValueView, }, } }; if (minMax != null) { minMax(sparseValueBin, accessor); } storage.Gltf.Accessors.Add(accessor); return(accessorIndex); } } var viewIndex = self.AddViewTo(storage, bufferIndex, offset, count); return(self.AddAccessorTo(storage, viewIndex, minMax, 0, count)); }