/// <summary>
/// Applies the cutting planes to the model.
/// </summary>
/// <param name="model">
/// The model to be modified (it is also the key to be searched for in the dictionaries).
/// </param>
/// <param name="transform">
/// The transform.
/// </param>
private void ApplyCuttingPlanesToModel(GeometryModel3D model, Transform3D transform)
{
if (model.Geometry == null)
{
return;
}
bool updateRequired = this.forceUpdate;
if (!this.IsEnabled)
{
updateRequired = true;
}
Geometry3D cutGeometry;
if (this.CutGeometries.TryGetValue(model, out cutGeometry))
{
if (cutGeometry != model.Geometry)
{
updateRequired = true;
}
}
Geometry3D originalGeometry;
if (!this.OriginalGeometries.TryGetValue(model, out originalGeometry))
{
originalGeometry = model.Geometry;
updateRequired = true;
}
this.TempOriginalGeometries.Add(model, originalGeometry);
if (!updateRequired)
{
return;
}
var g = originalGeometry as MeshGeometry3D;
if (this.IsEnabled)
{
XbimMeshLayer<WpfMeshGeometry3D, WpfMaterial> layer = model.GetValue(FrameworkElement.TagProperty) as XbimMeshLayer<WpfMeshGeometry3D, WpfMaterial>;
// todo: bonghi: in the click mechanism the default is to use
// var frag = layer.Visible.Meshes.Find(hit.VertexIndex1);
// but there are cases when the new indices created below are not successfully returned from that query
// data must be added in this stage somehow to add ways to identify the fragment.
//
var inverseTransform = transform.Inverse;
foreach (var cp in this.CuttingPlanes)
{
var p = inverseTransform.Transform(cp.Position);
var p2 = inverseTransform.Transform(cp.Position + cp.Normal);
var n = p2 - p;
// var p = transform.Transform(cp.Position);
// var n = transform.Transform(cp.Normal);
g = XbimMeshHelper.Cut(g, p, n);
}
}
model.Geometry = g;
this.TempCutGeometries.Add(model, g);
}
