public final int toRGB() {
int ir = (int) (r * 255 + 0.5);
int ig = (int) (g * 255 + 0.5);
int ib = (int) (b * 255 + 0.5);
ir = MathUtils.clamp(ir, 0, 255);
ig = MathUtils.clamp(ig, 0, 255);
ib = MathUtils.clamp(ib, 0, 255);
return (ir << 16) | (ig << 8) | ib;
}
/**
* Quantize the specified colors to 8-bit RGB format. The returned array contains 3 bytes for each
* color in the original array.
*
* @param color array of colors to quantize
* @return array of quantized RGB values
*/
public static final byte[] quantizeRGB8(Color[] color) {
byte[] output = new byte[color.length * 3];
for (int i = 0, index = 0; i < color.length; i++, index += 3) {
float[] rgb = color[i].getRGB();
output[index + 0] = (byte) MathUtils.clamp((int) (rgb[0] * 255 + 0.5f), 0, 255);
output[index + 1] = (byte) MathUtils.clamp((int) (rgb[1] * 255 + 0.5f), 0, 255);
output[index + 2] = (byte) MathUtils.clamp((int) (rgb[2] * 255 + 0.5f), 0, 255);
}
return output;
}
public float getPrimitiveBound(int primID, int i) {
int quad = 4 * primID;
int a = 3 * quads[quad + 0];
int b = 3 * quads[quad + 1];
int c = 3 * quads[quad + 2];
int d = 3 * quads[quad + 3];
int axis = i >>> 1;
if ((i & 1) == 0)
return MathUtils.min(points[a + axis], points[b + axis], points[c + axis], points[d + axis]);
else
return MathUtils.max(points[a + axis], points[b + axis], points[c + axis], points[d + axis]);
}
public final int toRGBE() {
// encode the color into 32bits while preserving HDR using Ward's RGBE
// technique
float v = MathUtils.max(r, g, b);
if (v < 1e-32f) return 0;
// get mantissa and exponent
float m = v;
int e = 0;
if (v > 1.0f) {
while (m > 1.0f) {
m *= 0.5f;
e++;
}
} else if (v <= 0.5f) {
while (m <= 0.5f) {
m *= 2.0f;
e--;
}
}
v = (m * 255.0f) / v;
int c = (e + 128);
c |= ((int) (r * v) << 24);
c |= ((int) (g * v) << 16);
c |= ((int) (b * v) << 8);
return c;
}
public final Color constrainRGB() {
// clamp the RGB value to a representable value
float w = -MathUtils.min(0, r, g, b);
if (w > 0) {
r += w;
g += w;
b += w;
}
return this;
}
public void prepareShadingState(ShadingState state) {
state.init();
state.getRay().getPoint(state.getPoint());
Instance parent = state.getInstance();
Point3 p = parent.transformWorldToObject(state.getPoint());
float deriv = p.x * p.x + p.y * p.y + p.z * p.z - ri2 - ro2;
state.getNormal().set(p.x * deriv, p.y * deriv, p.z * deriv + 2 * ro2 * p.z);
state.getNormal().normalize();
double phi = Math.asin(MathUtils.clamp(p.z / ri, -1, 1));
double theta = Math.atan2(p.y, p.x);
if (theta < 0) theta += 2 * Math.PI;
state.getUV().x = (float) (theta / (2 * Math.PI));
state.getUV().y = (float) ((phi + Math.PI / 2) / Math.PI);
state.setShader(parent.getShader(0));
state.setModifier(parent.getModifier(0));
Vector3 worldNormal = parent.transformNormalObjectToWorld(state.getNormal());
state.getNormal().set(worldNormal);
state.getNormal().normalize();
state.getGeoNormal().set(state.getNormal());
state.setBasis(OrthoNormalBasis.makeFromW(state.getNormal()));
}
public final Color clamp(float min, float max) {
r = MathUtils.clamp(r, min, max);
g = MathUtils.clamp(r, min, max);
b = MathUtils.clamp(r, min, max);
return this;
}
public final float getMax() {
return MathUtils.max(r, g, b);
}
public final float getMin() {
return MathUtils.min(r, g, b);
}