<Viewport3D>
<Viewport3D.Camera>
<PerspectiveCamera Position="2,0,10" LookDirection="0.2,0.4,-1" FieldOfView="65" UpDirection="0,1,0" />
</Viewport3D.Camera>
<ModelVisual3D>
<ModelVisual3D.Content>
<Model3DGroup>
<AmbientLight Color="fff" />
<GeometryModel3D>
<GeometryModel3D.Geometry>
<MeshGeometry3D Positions="..."
Normals="..."
TriangleIndices="..." />
</GeometryModel3D.Geometry>
<GeometryModel3D.Material>
<DiffuseMaterial Brush="Red" />
</GeometryModel3D.Material>
</GeometryModel3D>
</Model3DGroup>
</ModelVisual3D.Content>
</ModelVisual3D>
</Viewport3D>