/// <summary>
/// Called when the renderer is drawing the geometry of a <see cref="ModelMesh"/> instance.
/// </summary>
/// <param name="geometry">The <see cref="ModelMeshGeometry"/> which is being drawn.</param>
/// <param name="material">The <see cref="Material"/> with which to draw the geometry.</param>
protected virtual void OnDrawingModelMeshGeometry(ModelMeshGeometry geometry, Material material)
{
material.Effect.ConfigureForGeometry(geometry.GeometryStream);
material.Apply();
foreach (var pass in material.Effect.CurrentTechnique.Passes)
{
pass.Apply();
var gfx = geometry.GeometryStream.Ultraviolet.GetGraphics();
gfx.SetGeometryStream(geometry.GeometryStream);
if (geometry.GeometryStream.HasIndices)
{
gfx.DrawIndexedPrimitives(geometry.PrimitiveType, 0, geometry.PrimitiveCount);
}
else
{
gfx.DrawPrimitives(geometry.PrimitiveType, 0, geometry.PrimitiveCount);
}
}
}
/// <inheritdoc/>
public override unsafe Model Process(ContentManager manager, IContentProcessorMetadata metadata, StlModelDescription input)
{
var stlMetadata = metadata.As <StlModelProcessorMetadata>();
var vertexBuffer = VertexBuffer.Create <StlModelVertex>((input.Triangles?.Count ?? 0) * 3);
if (input.Triangles != null)
{
var facetOffset = 0;
var facetSizeInBytes = sizeof(StlModelVertex) * 3;
var vertices = stackalloc StlModelVertex[3];
for (var i = 0; i < input.Triangles.Count; i++)
{
var triangle = input.Triangles[i];
if (triangle == null)
{
throw new InvalidDataException(UltravioletStrings.MalformedContentFile);
}
if (stlMetadata.SwapWindingOrder)
{
vertices[0] = new StlModelVertex {
Position = triangle.Vertex3, Normal = triangle.Normal
};
vertices[1] = new StlModelVertex {
Position = triangle.Vertex2, Normal = triangle.Normal
};
vertices[2] = new StlModelVertex {
Position = triangle.Vertex1, Normal = triangle.Normal
};
}
else
{
vertices[0] = new StlModelVertex {
Position = triangle.Vertex1, Normal = triangle.Normal
};
vertices[1] = new StlModelVertex {
Position = triangle.Vertex2, Normal = triangle.Normal
};
vertices[2] = new StlModelVertex {
Position = triangle.Vertex3, Normal = triangle.Normal
};
}
vertexBuffer.SetRawData((IntPtr)vertices, 0, facetOffset, facetSizeInBytes, SetDataOptions.NoOverwrite);
facetOffset += facetSizeInBytes;
}
}
var geometryStream = GeometryStream.Create();
geometryStream.Attach(vertexBuffer);
var globalTransform = Matrix.Identity;
if (stlMetadata.RotationX != 0.0f || stlMetadata.RotationY != 0.0f || stlMetadata.RotationZ != 0.0f || stlMetadata.Scale != 1.0f)
{
Matrix.CreateRotationX(stlMetadata.RotationX, out var rotX);
Matrix.CreateRotationY(stlMetadata.RotationY, out var rotY);
Matrix.CreateRotationZ(stlMetadata.RotationZ, out var rotZ);
Matrix.CreateScale(stlMetadata.Scale, out var scale);
Matrix.Multiply(ref globalTransform, ref rotZ, out globalTransform);
Matrix.Multiply(ref globalTransform, ref rotX, out globalTransform);
Matrix.Multiply(ref globalTransform, ref rotY, out globalTransform);
Matrix.Multiply(ref globalTransform, ref scale, out globalTransform);
}
var modelMeshMaterial = stlMetadata.DefaultMaterial ?? new BasicMaterial()
{
DiffuseColor = Color.White
};
var modelMeshGeometry = new ModelMeshGeometry(PrimitiveType.TriangleList, geometryStream, vertexBuffer.VertexCount, 0, modelMeshMaterial);
var modelMesh = new ModelMesh(0, null, new[] { modelMeshGeometry });
var modelNode = new ModelNode(0, null, modelMesh, null, globalTransform);
var modelScene = new ModelScene(0, input.Name, new[] { modelNode });
var model = new Model(manager.Ultraviolet, new[] { modelScene });
return(model);
}
