public RGB getAmbientColor(float ambience, Vector3D hitPoint) {
RGB original = getColor();
double reflectance = getReflectance();
if (texture != null) {
if (texture instanceof ImageTexture) {
float theta = (float) Math.acos((hitPoint.getZ() - this.origin.getZ()) / this.radius);
float phi =
(float)
Math.atan2(
hitPoint.getY() - this.origin.getY(), hitPoint.getX() - this.origin.getX());
if (phi < 0) {
phi += 2 * Math.PI;
}
float u = (float) (phi / (2 * Math.PI));
float v = (float) ((Math.PI - theta) / Math.PI);
original = texture.getValue(new Vector2D(u, v), hitPoint);
} else {
original = texture.getValue(null, hitPoint);
}
}
if (reflectance == 0) {
return original;
} else {
return new RGB(
(int) (original.getRed() * reflectance),
(int) (original.getGreen() * reflectance),
(int) (original.getBlue() * reflectance));
}
}
public RGB getLitColor(Light light, Vector3D point, float ambience) {
float nDotL = getNDotL(point, light.getLightVector());
if (ambience == 0) {
RGB multipliedLight = light.getColor().multiply(getAmbientColor(ambience, point));
return multipliedLight.multiplyByScalar(nDotL);
} else {
int color = (int) ((ambience + (getReflectance() * nDotL)) * 255);
return new RGB(color, color, color);
}
}
