@Override
public Vec3f getMax(Vec3f max) {
if (max == null) {
max = new Vec3f();
}
max.x = maxX;
max.y = maxY;
max.z = 0.0f;
return max;
}
@Override
public Vec3f getMin(Vec3f min) {
if (min == null) {
min = new Vec3f();
}
min.x = minX;
min.y = minY;
min.z = 0.0f;
return min;
}
protected void initParticles() {
pAndsBuff.clear();
velBuff.clear();
lifespanBuff.clear();
ageBuff.clear();
float[] velocity = dir.dot(speed);
for (int i = 0; i < particleCount; i++) {
pAndsBuff.put(
new float[] {
((float) Math.random() - 0.5f) * 50f, 50f, ((float) Math.random() - 0.5f) * 50f, 0.016f
});
velBuff.put(new float[] {velocity[0], velocity[1], velocity[2], 0f});
ageBuff.put(0f);
if (i < startCount) {
lifespanBuff.put(1f);
} else {
lifespanBuff.put(0f);
}
}
pAndsBuff.rewind();
velBuff.rewind();
lifespanBuff.rewind();
ageBuff.rewind();
newParticles = (int) (birthRate * timeBetweenAni);
}
/** A view matrix defined by an eye and target position (same as gluLookAt) */
public static Mat4f lookAt(
float eyeX,
float eyeY,
float eyeZ,
float centerX,
float centerY,
float centerZ,
float upX,
float upY,
float upZ) {
Vec3f f = new Vec3f(centerX - eyeX, centerY - eyeY, centerZ - eyeZ).normalize();
Vec3f up = new Vec3f(upX, upY, upZ).normalize();
Vec3f s = f.cross(up).normalize();
Vec3f u = s.cross(f).normalize();
Mat4f m1 =
new Mat4f(
new float[] {s.x, u.x, -f.x, 0, s.y, u.y, -f.y, 0, s.z, u.z, -f.z, 0, 0, 0, 0, 1});
Mat4f m2 = translation(-eyeX, -eyeY, -eyeZ);
return m1.times(m2);
}
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);
}
