/**
* Prepare the light for rendering.
*
* @param width the output image width
* @param height the output image height
*/
public void prepare(int width, int height) {
float lx = (float) (Math.cos(azimuth) * Math.cos(elevation));
float ly = (float) (Math.sin(azimuth) * Math.cos(elevation));
float lz = (float) Math.sin(elevation);
direction = new Vector3f(lx, ly, lz);
direction.normalize();
if (type != DISTANT) {
lx *= distance;
ly *= distance;
lz *= distance;
lx += width * centreX;
ly += height * centreY;
}
position = new Vector3f(lx, ly, lz);
realColor.set(new Color(color));
realColor.scale(intensity);
cosConeAngle = (float) Math.cos(coneAngle);
}
/**
* Specifies the angle of the effect.
*
* @param angle the angle of the effect.
* @angle
* @see #getAngle
*/
public void setAngle(float angle) {
this.angle = angle;
float cos = (float) Math.cos(angle);
float sin = (float) Math.sin(angle);
m00 = cos;
m01 = sin;
m10 = -sin;
m11 = cos;
}
private int getEnvironmentMap(Vector3f normal, int[] inPixels, int width, int height) {
if (environmentMap != null) {
float angle = (float) Math.acos(-normal.y);
float x, y;
y = angle / ImageMath.PI;
if (y == 0.0f || y == 1.0f) x = 0.0f;
else {
float f = normal.x / (float) Math.sin(angle);
if (f > 1.0f) f = 1.0f;
else if (f < -1.0f) f = -1.0f;
x = (float) Math.acos(f) / ImageMath.PI;
}
// A bit of empirical scaling....
x = ImageMath.clamp(x * envWidth, 0, envWidth - 1);
y = ImageMath.clamp(y * envHeight, 0, envHeight - 1);
int ix = (int) x;
int iy = (int) y;
float xWeight = x - ix;
float yWeight = y - iy;
int i = envWidth * iy + ix;
int dx = ix == envWidth - 1 ? 0 : 1;
int dy = iy == envHeight - 1 ? 0 : envWidth;
return ImageMath.bilinearInterpolate(
xWeight,
yWeight,
envPixels[i],
envPixels[i + dx],
envPixels[i + dy],
envPixels[i + dx + dy]);
}
return 0;
}