private static Intersection getIntersection(Ray ray, SphereObject obj, Model model) {
RealMatrix transform = obj.getTransform();
final RealMatrix transformInverse = obj.getTransformInverse();
ray = ray.transform(transformInverse);
Vector3D c = VectorUtils.toVector3D(obj.getCenter());
Vector3D p0 = VectorUtils.toVector3D(ray.getP0());
Vector3D p1 = VectorUtils.toVector3D(ray.getP1());
float a = (float) p1.dotProduct(p1);
Vector3D p0c = p0.subtract(c);
float b = (float) p1.dotProduct(p0c) * 2.0f;
float cc = (float) (p0c.dotProduct(p0c)) - obj.getSize() * obj.getSize();
Double t = quadraticEquationRoot1(a, b, cc);
if (t == null || t < EPSILON) {
return new Intersection(false);
}
Intersection result = new Intersection(true);
result.setObject(obj);
final Vector3D p = p0.add(p1.scalarMultiply(t));
RealVector pv = VectorUtils.toRealVector(p);
pv.setEntry(3, 1.0);
RealVector pt = transform.preMultiply(pv);
result.setP(VectorUtils.toVector3D(pt));
RealVector nv = pv.subtract(obj.getCenter());
final RealVector nvt = transformInverse.transpose().preMultiply(nv);
result.setN(VectorUtils.toVector3D(nvt).normalize());
result.setDistance(t);
return result;
}
private static int toColour(RealVector ambient) {
final double r = ambient.getEntry(0);
final double g = ambient.getEntry(1);
final double b = ambient.getEntry(2);
int rc = 256 * 256 * (int) (255. * r);
int rg = 256 * (int) (255. * g);
int rb = (int) (255. * b);
return rc + rg + rb;
}
private static Intersection getIntersection(
TriangleObject obj, DecompositionSolver solver, Vector3D p, Vector3D pc, double[] params) {
RealVector constants = new ArrayRealVector(params, false);
RealVector solution = solver.solve(constants);
double alpfa = solution.getEntry(0);
double beta = solution.getEntry(1);
boolean match = false;
if (alpfa >= 0 && beta >= 0 && alpfa + beta <= 1.0) {
match = true;
} else {
match = false;
}
final Intersection intersection = new Intersection(match);
intersection.setObject(obj);
intersection.setP(p);
return intersection;
}