if (ortho) {
shadowCam.setFrustum(-1, 1, -1, 1, 1, -1);
}
// create transform to rotate points to viewspace
Matrix4f viewProjMatrix = shadowCam.getViewProjectionMatrix();
BoundingBox splitBB = computeBoundForPoints(points, viewProjMatrix);
TempVars vars = TempVars.get();
BoundingBox casterBB = new BoundingBox();
BoundingBox receiverBB = new BoundingBox();
int casterCount = 0, receiverCount = 0;
for (int i = 0; i < receivers.size(); i++) {
// convert bounding box to light's viewproj space
Geometry receiver = receivers.get(i);
BoundingVolume bv = receiver.getWorldBound();
BoundingVolume recvBox = bv.transform(viewProjMatrix, vars.bbox);
if (splitBB.intersects(recvBox)) {
//Nehon : prevent NaN and infinity values to screw the final bounding box
if (!Float.isNaN(recvBox.getCenter().x) && !Float.isInfinite(recvBox.getCenter().x)) {
receiverBB.mergeLocal(recvBox);
receiverCount++;
}
}
}
for (int i = 0; i < occluders.size(); i++) {
// convert bounding box to light's viewproj space
Geometry occluder = occluders.get(i);
BoundingVolume bv = occluder.getWorldBound();
BoundingVolume occBox = bv.transform(viewProjMatrix, vars.bbox);
boolean intersects = splitBB.intersects(occBox);
if (!intersects && occBox instanceof BoundingBox) {
BoundingBox occBB = (BoundingBox) occBox;
//Kirill 01/10/2011
// Extend the occluder further into the frustum
// This fixes shadow dissapearing issues when
// the caster itself is not in the view camera
// but its shadow is in the camera
// The number is in world units
occBB.setZExtent(occBB.getZExtent() + 50);
occBB.setCenter(occBB.getCenter().addLocal(0, 0, 25));
if (splitBB.intersects(occBB)) {
//Nehon : prevent NaN and infinity values to screw the final bounding box
if (!Float.isNaN(occBox.getCenter().x) && !Float.isInfinite(occBox.getCenter().x)) {
// To prevent extending the depth range too much
// We return the bound to its former shape
// Before adding it
occBB.setZExtent(occBB.getZExtent() - 50);
occBB.setCenter(occBB.getCenter().subtractLocal(0, 0, 25));
casterBB.mergeLocal(occBox);
casterCount++;
}
if (splitOccluders != null) {
splitOccluders.add(occluder);
}
}
} else if (intersects) {
casterBB.mergeLocal(occBox);
casterCount++;
if (splitOccluders != null) {
splitOccluders.add(occluder);
}
}
}
//Nehon 08/18/2010 this is to avoid shadow bleeding when the ground is set to only receive shadows
if (casterCount != receiverCount) {
casterBB.setXExtent(casterBB.getXExtent() + 2.0f);
casterBB.setYExtent(casterBB.getYExtent() + 2.0f);
casterBB.setZExtent(casterBB.getZExtent() + 2.0f);
}
Vector3f casterMin = casterBB.getMin(vars.vect1);
Vector3f casterMax = casterBB.getMax(vars.vect2);
Vector3f receiverMin = receiverBB.getMin(vars.vect3);
Vector3f receiverMax = receiverBB.getMax(vars.vect4);
Vector3f splitMin = splitBB.getMin(vars.vect5);
Vector3f splitMax = splitBB.getMax(vars.vect6);
splitMin.z = 0;
// if (!ortho) {
// shadowCam.setFrustumPerspective(45, 1, 1, splitMax.z);
// }
Matrix4f projMatrix = shadowCam.getProjectionMatrix();
Vector3f cropMin = vars.vect7;
Vector3f cropMax = vars.vect8;
// IMPORTANT: Special handling for Z values
cropMin.x = max(max(casterMin.x, receiverMin.x), splitMin.x);
cropMax.x = min(min(casterMax.x, receiverMax.x), splitMax.x);
cropMin.y = max(max(casterMin.y, receiverMin.y), splitMin.y);
cropMax.y = min(min(casterMax.y, receiverMax.y), splitMax.y);
cropMin.z = min(casterMin.z, splitMin.z);
cropMax.z = min(receiverMax.z, splitMax.z);
// Create the crop matrix.
float scaleX, scaleY, scaleZ;
float offsetX, offsetY, offsetZ;
scaleX = (2.0f) / (cropMax.x - cropMin.x);
scaleY = (2.0f) / (cropMax.y - cropMin.y);
//Shadow map stabilization approximation from shaderX 7
//from Practical Cascaded Shadow maps adapted to PSSM
//scale stabilization
float halfTextureSize = shadowMapSize * 0.5f;
if (halfTextureSize != 0 && scaleX >0 && scaleY>0) {
float scaleQuantizer = 0.1f;
scaleX = 1.0f / FastMath.ceil(1.0f / scaleX * scaleQuantizer) * scaleQuantizer;
scaleY = 1.0f / FastMath.ceil(1.0f / scaleY * scaleQuantizer) * scaleQuantizer;
}
offsetX = -0.5f * (cropMax.x + cropMin.x) * scaleX;
offsetY = -0.5f * (cropMax.y + cropMin.y) * scaleY;
//Shadow map stabilization approximation from shaderX 7
//from Practical Cascaded Shadow maps adapted to PSSM
//offset stabilization
if (halfTextureSize != 0 && scaleX >0 && scaleY>0) {
offsetX = FastMath.ceil(offsetX * halfTextureSize) / halfTextureSize;
offsetY = FastMath.ceil(offsetY * halfTextureSize) / halfTextureSize;
}
scaleZ = 1.0f / (cropMax.z - cropMin.z);
offsetZ = -cropMin.z * scaleZ;
Matrix4f cropMatrix = vars.tempMat4;
cropMatrix.set(scaleX, 0f, 0f, offsetX,
0f, scaleY, 0f, offsetY,
0f, 0f, scaleZ, offsetZ,
0f, 0f, 0f, 1f);
Matrix4f result = new Matrix4f();
result.set(cropMatrix);
result.multLocal(projMatrix);
vars.release();
shadowCam.setProjectionMatrix(result);
}