@Override
public Vec3f getMin(Vec3f min) {
if (min == null) {
min = new Vec3f();
}
min.x = minX;
min.y = minY;
min.z = 0.0f;
return min;
}
@Override
public Vec3f getMax(Vec3f max) {
if (max == null) {
max = new Vec3f();
}
max.x = maxX;
max.y = maxY;
max.z = 0.0f;
return max;
}
public int generateBumpPixel(BufferedImage image, int x, int y, float a) {
Vec3f S = new Vec3f();
Vec3f T = new Vec3f();
Vec3f N = new Vec3f();
S.x = 1;
S.y = 0;
S.z = a * getHeight(image, x + 1, y) - a * getHeight(image, x - 1, y);
T.x = 0;
T.y = 1;
T.z = a * getHeight(image, x, y + 1) - a * getHeight(image, x, y - 1);
float den = (float) Math.sqrt(S.z * S.z + T.z * T.z + 1);
N.x = -S.z;
N.y = -T.z;
N.z = 1;
N.divideLocal(den);
return vectorToColor(N.x, N.y, N.z);
}
