public void updateArea() {
Vector3 u = new Vector3(), v = new Vector3(), n = new Vector3();
u.set(
mesh.verts[3 * v1] - mesh.verts[3 * v0],
mesh.verts[3 * v1 + 1] - mesh.verts[3 * v0 + 1],
mesh.verts[3 * v1 + 2] - mesh.verts[3 * v0 + 2]);
v.set(
mesh.verts[3 * v2] - mesh.verts[3 * v0],
mesh.verts[3 * v2 + 1] - mesh.verts[3 * v0 + 1],
mesh.verts[3 * v2 + 2] - mesh.verts[3 * v0 + 2]);
n.cross(u, v);
area = 0.5 * n.length();
oneOverArea = 1. / area;
}
/**
* Calculate the BRDF value for this material at the intersection described in record. Returns the
* BRDF color in outColor.
*
* @param outColor Space for the output color
* @param scene The scene
* @param lights The lights
* @param toEye Vector pointing towards the eye
* @param record The intersection record, which hold the location, normal, etc.
* @param depth The depth of recursive calls. You can ignore this parameter.
* @param contribution The contribution of the current ray. You can ignore this parameter.
* @param internal You can ignore this parameter.
*/
public void shade(
Color outColor,
Scene scene,
ArrayList<Light> lights,
Vector3 toEye,
IntersectionRecord record,
int depth,
double contribution,
boolean internal) {
for (Light light : lights) {
if (!isShadowed(scene, light, record)) {
L.sub(light.position, record.location);
L.normalize();
double dot = L.dot(record.normal);
if (dot > 0) {
outColor.r += dot * light.intensity.r * diffuseColor.r;
outColor.g += dot * light.intensity.g * diffuseColor.g;
outColor.b += dot * light.intensity.b * diffuseColor.b;
}
H.set(L);
H.add(toEye);
H.normalize();
dot = H.dot(record.normal);
if (dot > 0) {
dot = Math.pow(dot, exponent);
outColor.r += dot * light.intensity.r * specularColor.r;
outColor.g += dot * light.intensity.g * specularColor.g;
outColor.b += dot * light.intensity.b * specularColor.b;
}
}
}
}