private void UpdateShadowModel()
{
if (_planarShadowMeshCreator == null)
{
return;
}
// PlanarShadowMeshCreator generates a MeshGeometry3D that represents a shadow that is flattened to the plane.
MeshGeometry3D shadowMesh;
if (_currentShadowLight == _shadowDirectionalLight)
{
shadowMesh = _planarShadowMeshCreator.ApplyShadowMatrix(_shadowDirectionalLight.Direction);
}
else
{
shadowMesh = _planarShadowMeshCreator.ApplyShadowMatrix(_shadowPointLight.Position);
}
if (_shadowModel3D == null)
{
var shadowMaterial = (TransparentShadowCheckBox.IsChecked ?? false) ? _transparentShadowMaterial : _solidShadowMaterial;
_shadowModel3D = new GeometryModel3D(shadowMesh, shadowMaterial);
if (_shadowVisual3D != null)
{
MainViewport.Children.Remove(_shadowVisual3D);
}
_shadowVisual3D = _shadowModel3D.CreateModelVisual3D();
_shadowVisual3D.Transform = new TranslateTransform3D(0, 0.05, 0); // Lift the shadow 3D model slightly above the ground
MainViewport.Children.Add(_shadowVisual3D);
}
else
{
_shadowModel3D.Geometry = shadowMesh;
}
}
