/// <summary>
/// Static helper used by ModelVisual3D and Viewport3DVisual to hit test
/// against their children collections.
/// </summary>
internal static HitTestResultBehavior HitTestChildren(
HitTestFilterCallback filterCallback,
RayHitTestParameters rayParams,
IVisual3DContainer container)
{
if (container != null)
{
int childrenCount = container.GetChildrenCount();
for (int i = childrenCount - 1; i >= 0; i--)
{
Visual3D child = container.GetChild(i);
// Visuall3D.RayHitTest does not apply the Visual3D's Transform. We need to
// transform into the content's space before hit testing.
Transform3D transform = child.Transform;
rayParams.PushVisualTransform(transform);
// Perform the hit-test against the child.
HitTestResultBehavior result = child.RayHitTest(filterCallback, rayParams);
rayParams.PopTransform(transform);
if (result == HitTestResultBehavior.Stop)
{
return HitTestResultBehavior.Stop;
}
}
}
return HitTestResultBehavior.Continue;
}
//------------------------------------------------------
//
// Constructors
//
//------------------------------------------------------
#region Constructors
internal Visual3DCollection(IVisual3DContainer owner)
{
_owner = owner;
}
