private bool SetDracoGeometryInfo(Mesh rhinoMesh)
{
var dracoComp = DracoCompression.Compress(
rhinoMesh,
new DracoCompressionOptions()
{
VertexColorFormat = DracoColorFormat.RGBA,
CompressionLevel = options.DracoCompressionLevel,
IncludeNormals = ExportNormals(rhinoMesh),
IncludeTextureCoordinates = ExportTextureCoordinates(rhinoMesh),
IncludeVertexColors = ExportVertexColors(rhinoMesh),
PositionQuantizationBits = options.DracoQuantizationBitsPosition,
NormalQuantizationBits = options.DracoQuantizationBitsNormal,
TextureCoordintateQuantizationBits = options.DracoQuantizationBitsTexture
}
);
currentGeometryInfo = AddDracoGeometry(dracoComp);
return(currentGeometryInfo.Success);
}
private void AddRhinoObjectDraco(ObjectExportData data)
{
var materialIndex = GetMaterial(data.RenderMaterial, data.Object);
var primitives = new List <MeshPrimitive>();
// For each rhino mesh, create gl-buffers, gl-meshes, etc.
foreach (var rhinoMesh in data.Meshes)
{
if (options.MapRhinoZToGltfY)
{
rhinoMesh.Transform(ZtoYUp);
}
rhinoMesh.TextureCoordinates.ReverseTextureCoordinates(1);
var dracoComp = DracoCompression.Compress(
rhinoMesh,
new DracoCompressionOptions()
{
CompressionLevel = options.DracoCompressionLevel,
IncludeNormals = true,
IncludeTextureCoordinates = true,
IncludeVertexColors = false,
PositionQuantizationBits = options.DracoQuantizationBitsPosition,
NormalQuantizationBits = options.DracoQuantizationBitsNormal,
TextureCoordintateQuantizationBits = options.DracoQuantizationBitsTexture
}
);
DracoGeometryInfo dracoGeoInfo = AddDracoGeometry(dracoComp);
var compMeshBufferView = new BufferView()
{
Buffer = dracoGeoInfo.bufferIndex,
ByteOffset = dracoGeoInfo.byteOffset,
ByteLength = dracoGeoInfo.byteLength,
};
int compMeshBufferViewIdx = dummy.BufferViews.AddAndReturnIndex(compMeshBufferView);
var vtxAccessor = new Accessor
{
Type = Accessor.TypeEnum.VEC3,
ComponentType = Accessor.ComponentTypeEnum.FLOAT,
Count = dracoGeoInfo.verticesNum,
Min = dracoGeoInfo.verticesMin,
Max = dracoGeoInfo.verticesMax,
ByteOffset = 0,
};
int vtxAccessorIdx = dummy.Accessors.AddAndReturnIndex(vtxAccessor);
// // Accessor Triangles Vertex IDs
var idsAccessor = new Accessor
{
Type = Accessor.TypeEnum.SCALAR,
ComponentType = Accessor.ComponentTypeEnum.UNSIGNED_INT,
Count = dracoGeoInfo.trianglesNum,
Min = new float[] { dracoGeoInfo.trianglesMin },
Max = new float[] { dracoGeoInfo.trianglesMax },
ByteOffset = 0,
};
int idsAccessorIdx = dummy.Accessors.AddAndReturnIndex(idsAccessor);
// Accessor Normals
var normalsAccessor = new Accessor
{
Type = Accessor.TypeEnum.VEC3,
ComponentType = Accessor.ComponentTypeEnum.FLOAT,
Count = dracoGeoInfo.normalsNum,
Min = dracoGeoInfo.normalsMin,
Max = dracoGeoInfo.normalsMax,
ByteOffset = 0,
};
int normalsAccessorIdx = dummy.Accessors.AddAndReturnIndex(normalsAccessor);
var primitive = new MeshPrimitive()
{
Attributes = new Dictionary <string, int>()
{
{ Constants.PositionAttributeTag, vtxAccessorIdx },
{ Constants.NormalAttributeTag, normalsAccessorIdx },
},
Indices = idsAccessorIdx,
Material = materialIndex,
};
if (dracoGeoInfo.texCoordsNum > 0)
{
// Accessor TexCoords
var texCoordsAccessor = new Accessor
{
Type = Accessor.TypeEnum.VEC2,
ComponentType = Accessor.ComponentTypeEnum.FLOAT,
Count = dracoGeoInfo.texCoordsNum,
Min = dracoGeoInfo.texCoordsMin,
Max = dracoGeoInfo.texCoordsMax,
ByteOffset = 0,
};
int texCoordsAccessorIdx = dummy.Accessors.AddAndReturnIndex(texCoordsAccessor);
primitive.Attributes.Add(Constants.TexCoord0AttributeTag, texCoordsAccessorIdx);
primitive.Extensions = new Dictionary <string, object>()
{
{
Constants.DracoMeshCompressionExtensionTag,
new
{
bufferView = compMeshBufferViewIdx,
attributes = new
{
POSITION = 0,
NORMAL = 1,
TEXCOORD_0 = 2
}
}
}
};
}
else
{
primitive.Extensions = new Dictionary <string, object>()
{
{
Constants.DracoMeshCompressionExtensionTag,
new
{
bufferView = compMeshBufferViewIdx,
attributes = new
{
POSITION = 0,
NORMAL = 1,
}
}
}
};
}
// Create mesh
primitives.Add(primitive);
}
var mesh = new glTFLoader.Schema.Mesh()
{
Primitives = primitives.ToArray(),
};
int meshIndex = dummy.Meshes.AddAndReturnIndex(mesh);
var node = new Node()
{
Mesh = meshIndex,
};
int nodeIndex = dummy.Nodes.AddAndReturnIndex(node);
dummy.Scenes[dummy.Scene].Nodes.Add(nodeIndex);
}