private double[][] getShadowSmoothKernel(int radius) {
double res[][] = shadowSmoothKernelMap.get(Integer.valueOf(radius));
if (res == null) {
FilterKernel shadowSmoothKernel = new GaussianFilterKernel();
double shadowKernelScale = 1.0;
double shadowScaledInvRadius =
1.0 / shadowSmoothRadius * shadowKernelScale * shadowSmoothKernel.getSpatialSupport();
int size = 2 * radius + 1;
res = new double[size][size];
for (int k = -radius; k <= radius; k++) {
int x = radius + k;
double k_square = MathLib.sqr(k * shadowScaledInvRadius);
for (int l = -radius; l <= radius; l++) {
int y = radius + l;
double r = MathLib.sqrt(k_square + MathLib.sqr(l * shadowScaledInvRadius));
res[x][y] = shadowSmoothKernel.getFilterCoeff(r);
}
}
synchronized (shadowSmoothKernelMap) {
shadowSmoothKernelMap.put(Integer.valueOf(radius), res);
}
}
return res;
}
