public void BuildPortalViewTree()
{
if (rootNode == null)
{
rootNode = PortalNode.QueryNode(null, -1);
}
//currentLayer = 0;
rootNode.Recycle();
BuildPortalViewTree(rootNode, 0);
}
private void BuildPortalViewTree(PortalNode p, int lastDepth)
{
if (lastDepth >= maxLayer)
{
return;
}
lastDepth++;
Camera currentCam = p.thisPortal == null ? rootCamera : p.thisPortal.portalCamera;
if (p.thisPortal != null)
{
currentCam.transform.position = p.position;
currentCam.transform.rotation = p.rotation;
currentCam.projectionMatrix = p.projMat;
currentCam.targetTexture = p.rt;
}
ScreenPoatalArea portalRect = p.thisPortal == null ?
new ScreenPoatalArea()
{
scrrenRect = new Rect(0, 0, 1, 1), minDeep = 0, maxDeep = currentCam.nearClipPlane
}
: p.thisPortal.otherPortal.GetPortalRect(currentCam);
foreach (var pair in PortalPair.portalPairs)
{
if (pair.portalA != null && pair.portalA.ShouldCameraRender(currentCam, portalRect))
{
p.nextPairs.Add(PortalNode.QueryNode(pair.portalA, lastDepth - 1));
}
if (pair.portalB != null && pair.portalB.ShouldCameraRender(currentCam, portalRect))
{
p.nextPairs.Add(PortalNode.QueryNode(pair.portalB, lastDepth - 1));
}
}
foreach (var node in p.nextPairs)
{
if (p.thisPortal != null)
{
currentCam.transform.position = p.position;
currentCam.transform.rotation = p.rotation;
currentCam.projectionMatrix = p.projMat;
currentCam.targetTexture = p.rt;
}
Transform Source = node.thisPortal.portalPlaneTransform;
Transform Destination = node.thisPortal.otherPortal.portalPlaneTransform;
Camera portalCamera = node.thisPortal.portalCamera;
// Rotate Source 180 degrees so PortalCamera is mirror image of MainCamera
Matrix4x4 destinationFlipRotation = Matrix4x4.TRS(ZeroV3, Quaternion.AngleAxis(180.0f, Vector3.up), OneV3);
Matrix4x4 sourceInvMat = destinationFlipRotation * Source.worldToLocalMatrix;
// Calculate translation and rotation of MainCamera in Source space
Vector3 cameraPositionInSourceSpace = ToV3(sourceInvMat * PosToV4(currentCam.transform.position));
Quaternion cameraRotationInSourceSpace = Quaternion.AngleAxis(180, Vector3.up) * Quaternion.Inverse(Source.rotation) * currentCam.transform.rotation;
// Transform Portal Camera to World Space relative to Destination transform,
// matching the Main Camera position/orientation
portalCamera.transform.position = Destination.TransformPoint(cameraPositionInSourceSpace);
portalCamera.transform.rotation = Destination.rotation * cameraRotationInSourceSpace;
node.position = Destination.TransformPoint(cameraPositionInSourceSpace);
node.rotation = Destination.rotation * cameraRotationInSourceSpace;
// Calculate clip plane for portal (for culling of objects inbetween destination camera and portal)
Vector4 clipPlaneWorldSpace = new Vector4(node.thisPortal.otherPortal.portalForward.x, node.thisPortal.otherPortal.portalForward.y,
node.thisPortal.otherPortal.portalForward.z, Vector3.Dot(Destination.position, -node.thisPortal.otherPortal.portalForward));
Vector4 clipPlaneCameraSpace = Matrix4x4.Transpose(Matrix4x4.Inverse(portalCamera.worldToCameraMatrix)) * clipPlaneWorldSpace;
// Update projection based on new clip plane
// Note: http://aras-p.info/texts/obliqueortho.html and http://www.terathon.com/lengyel/Lengyel-Oblique.pdf
//portalCamera.projectionMatrix = rootCamera.CalculateObliqueMatrix(clipPlaneCameraSpace);
node.projMat = rootCamera.CalculateObliqueMatrix(clipPlaneCameraSpace);
BuildPortalViewTree(node, lastDepth);
}
}