/// <summary>
/// Tests pointer against model intersections to
/// resolve actual model intersection at face level.
/// </summary>
private void PointerModelIntersectionsTest()
{
// Nothing to do if no intersections
if (pointerNodeIntersections.Count == 0)
{
return;
}
// Sort intersections by distance
pointerNodeIntersections.Sort();
// Iterate intersections
float?intersection = null;
float?closestIntersection = null;
Intersection.NodeIntersection closestModelIntersection = null;
foreach (var ni in pointerNodeIntersections)
{
// Ensure node is a ModelNode
if (false == (ni.Node is ModelNode))
{
continue;
}
// Get model
ModelNode node = (ModelNode)ni.Node;
ModelManager.ModelData model = node.Model;
// Test model
bool insideBoundingSphere;
int subMeshResult, planeResult;
intersection = Intersection.RayIntersectsDFMesh(
pointerRay,
node.Matrix,
ref model,
out insideBoundingSphere,
out subMeshResult,
out planeResult);
if (intersection != null)
{
if (closestIntersection == null || intersection < closestIntersection)
{
closestIntersection = intersection;
closestModelIntersection = ni;
}
}
}
// Store closest intersection
if (closestModelIntersection != null)
{
pointerOverModelNode = (ModelNode)closestModelIntersection.Node;
}
else
{
pointerOverModelNode = null;
}
}
/// <summary>
/// Recursively walks scene and batches visible submeshes.
/// </summary>
/// <param name="node">Start node.</param>
/// <param name="pointerIntersects">True if pointer intersects.</param>
protected void BatchNode(SceneNode node, bool pointerIntersects)
{
// Do nothing if not visible
if (!node.Visible)
{
return;
}
// Test node bounds against camera frustum
if (!camera.BoundingFrustum.Intersects(node.TransformedBounds))
{
return;
}
// Test if pointer still intersects at this level
float?intersectDistance = null;
if (pointerIntersects)
{
intersectDistance = pointerRay.Intersects(node.TransformedBounds);
if (intersectDistance == null)
{
pointerIntersects = false;
}
}
// Batch children of this node
foreach (SceneNode child in node.Children)
{
BatchNode(child, pointerIntersects);
}
// Batch node
if (node is ModelNode)
{
BatchModelNode((ModelNode)node);
if (pointerIntersects)
{
Intersection.NodeIntersection ni =
new Intersection.NodeIntersection(intersectDistance, node);
pointerNodeIntersections.Add(ni);
}
}
else if (node is GroundPlaneNode)
{
BatchGroundPlaneNode((GroundPlaneNode)node);
}
else if (node is BillboardNode)
{
BatchBillboardNode((BillboardNode)node);
}
else if (node is PointLightNode)
{
BatchPointLightNode((PointLightNode)node);
}
}
