private void UpdateVisibleBoxes()
{
if (!(CullingCheckBox.IsChecked ?? false) || _frustumStatuses == null)
{
return;
}
//
// IMPORTANT TIP:
//
// When you have many 3D objects, do not check each object if it is visible or not.
// Instead group the objects into lower number of groups (into ModelVisual3D, Model3DGroup or some other group).
// Then calculate the bounding box of each group.
// Finally check each group if it is visible or not and remove the hidden groups from visible objects.
// Get camera's viewProjection matrix
System.Windows.Media.Media3D.Matrix3D view, projection;
Camera1.GetCameraMatrixes(out view, out projection);
var viewProjection = view * projection;
// Create BoundingFrustum from camera view-projection matrix (we need to convert the matrix from WPF to SharpDX format)
var boundingFrustum = new SharpDX.BoundingFrustum(viewProjection.ToMatrix());
// We could also get the ViewProjection from DXScene (but when we are called from CameraChanged we may get an older version)
//if (MainDXViewportView.DXScene == null)
// return;
//SharpDX.Matrix worldViewProjectionMatrix = MainDXViewportView.DXScene.Camera.GetViewProjection();
//var boundingFrustum = new SharpDX.BoundingFrustum(worldViewProjectionMatrix);
bool hasChanged = false;
for (var i = 0; i < _frustumStatuses.Length; i++) // Use for instead of foreach to avoid creating enumerator object on each call of the method (on every frame)
{
var newVisibility = boundingFrustum.Contains(_frustumStatuses[i].Bounds);
if (newVisibility != _frustumStatuses[i].Visibility)
{
Material newMaterial;
switch (newVisibility)
{
case ContainmentType.Disjoint:
newMaterial = _hiddenMaterial;
break;
case ContainmentType.Contains:
newMaterial = _fullyVisibleMaterial;
break;
case ContainmentType.Intersects:
newMaterial = _partiallyVisibleMaterial;
break;
default:
newMaterial = null;
break;
}
_frustumStatuses[i].BoxVisual3D.Material = newMaterial;
FrustumVisibilityStatus.SetVisibility(ref _frustumStatuses[i], newVisibility);
hasChanged = true;
}
}
if (hasChanged)
{
UpdateStatistics();
}
}
public BoundingFrustum(Matrix viewProj)
{
this.sbf = new SharpDX.BoundingFrustum(viewProj);
}
public BoundingFrustum(SharpDX.BoundingFrustum bf)
{
this.sbf = bf;
}
public BoundingFrustum(SharpDX.BoundingFrustum bf)
{
this.sbf = bf;
}