public override void FindVisibleNodes(PCZCamera camera, ref List <PCZSceneNode> visibleNodeList, RenderQueue queue,
VisibleObjectsBoundsInfo visibleBounds, bool onlyShadowCasters,
bool displayNodes, bool showBoundingBoxes)
{
//return immediately if nothing is in the zone.
if (mHomeNodeList.Count == 0 && mVisitorNodeList.Count == 0 && mPortals.Count == 0)
{
return;
}
// Else, the zone is automatically assumed to be visible since either
// it is the camera the zone is in, or it was reached because
// a connecting portal was deemed visible to the camera.
// enable sky if called to do so for this zone
if (mHasSky)
{
// enable sky
mPCZSM.EnableSky(true);
}
// Recursively find visible nodes in the zone
WalkOctree(camera, ref visibleNodeList, queue, this.rootOctree, visibleBounds, false, onlyShadowCasters,
displayNodes,
showBoundingBoxes);
// find visible portals in the zone and recurse into them
bool vis;
foreach (Portal portal in mPortals)
{
// for portal, check visibility using world bounding sphere & direction
FrustumPlane pl = FrustumPlane.None;
vis = camera.IsObjectVisible(portal, out pl);
if (vis)
{
// portal is visible. Add the portal as extra culling planes to camera
int planes_added = camera.AddPortalCullingPlanes(portal);
// tell target zone it's visible this frame
portal.getTargetZone().LastVisibleFrame = mLastVisibleFrame;
portal.getTargetZone().LastVisibleFromCamera = camera;
// recurse into the connected zone
portal.getTargetZone().FindVisibleNodes(camera, ref visibleNodeList, queue, visibleBounds, onlyShadowCasters,
displayNodes, showBoundingBoxes);
if (planes_added > 0)
{
// Then remove the extra culling planes added before going to the next portal in this zone.
camera.RemovePortalCullingPlanes(portal);
}
}
}
}
private void WalkOctree(PCZCamera camera, ref List <PCZSceneNode> visibleNodeList, RenderQueue queue, Octree octant,
VisibleObjectsBoundsInfo visibleBounds, bool foundvisible, bool onlyShadowCasters,
bool displayNodes, bool showBoundingBoxes)
{
//return immediately if nothing is in the node.
if (octant.NunodeList == 0)
{
return;
}
Visibility v = Visibility.None;
if (foundvisible)
{
v = Visibility.Full;
}
else if (octant == this.rootOctree)
{
v = Visibility.Partial;
}
else
{
AxisAlignedBox box = octant.Box;
v = camera.GetVisibility(box);
}
// if the octant is visible, or if it's the root node...
if (v != Visibility.None)
{
//Add stuff to be rendered;
bool vis = true;
foreach (PCZSceneNode sn in octant.NodeList.Values)
{
// if the scene node is already visible, then we can skip it
if (sn.LastVisibleFrame != mLastVisibleFrame || sn.LastVisibleFromCamera != camera)
{
// if this octree is partially visible, manually cull all
// scene nodes attached directly to this level.
if (v == Visibility.Partial)
{
vis = camera.IsObjectVisible(sn.WorldAABB);
}
if (vis)
{
// add the node to the render queue
sn.AddToRenderQueue(camera, queue, onlyShadowCasters, visibleBounds);
// add it to the list of visible nodes
visibleNodeList.Add(sn);
// if we are displaying nodes, add the node renderable to the queue
if (displayNodes)
{
queue.AddRenderable(sn.GetDebugRenderable());
}
// if the scene manager or the node wants the bounding box shown, add it to the queue
if (sn.ShowBoundingBox || showBoundingBoxes)
{
sn.AddBoundingBoxToQueue(queue);
}
// flag the node as being visible this frame
sn.LastVisibleFrame = mLastVisibleFrame;
sn.LastVisibleFromCamera = camera;
}
}
}
Octree child;
bool childfoundvisible = (v == Visibility.Full);
if ((child = octant.Children[0, 0, 0]) != null)
{
WalkOctree(camera, ref visibleNodeList, queue, child, visibleBounds, childfoundvisible, onlyShadowCasters,
displayNodes, showBoundingBoxes);
}
if ((child = octant.Children[1, 0, 0]) != null)
{
WalkOctree(camera, ref visibleNodeList, queue, child, visibleBounds, childfoundvisible, onlyShadowCasters,
displayNodes, showBoundingBoxes);
}
if ((child = octant.Children[0, 1, 0]) != null)
{
WalkOctree(camera, ref visibleNodeList, queue, child, visibleBounds, childfoundvisible, onlyShadowCasters,
displayNodes, showBoundingBoxes);
}
if ((child = octant.Children[1, 1, 0]) != null)
{
WalkOctree(camera, ref visibleNodeList, queue, child, visibleBounds, childfoundvisible, onlyShadowCasters,
displayNodes, showBoundingBoxes);
}
if ((child = octant.Children[0, 0, 1]) != null)
{
WalkOctree(camera, ref visibleNodeList, queue, child, visibleBounds, childfoundvisible, onlyShadowCasters,
displayNodes, showBoundingBoxes);
}
if ((child = octant.Children[1, 0, 1]) != null)
{
WalkOctree(camera, ref visibleNodeList, queue, child, visibleBounds, childfoundvisible, onlyShadowCasters,
displayNodes, showBoundingBoxes);
}
if ((child = octant.Children[0, 1, 1]) != null)
{
WalkOctree(camera, ref visibleNodeList, queue, child, visibleBounds, childfoundvisible, onlyShadowCasters,
displayNodes, showBoundingBoxes);
}
if ((child = octant.Children[1, 1, 1]) != null)
{
WalkOctree(camera, ref visibleNodeList, queue, child, visibleBounds, childfoundvisible, onlyShadowCasters,
displayNodes, showBoundingBoxes);
}
}
}
