Exemplo n.º 1
0
  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;
  }
Exemplo n.º 2
0
 public static Intersection intersect(Ray ray, Model model) {
   Intersection result = new Intersection(false);
   int matchCount = 0;
   for (DrawedObject obj : model.getObjects()) {
     if (obj instanceof TriangleObject) {
       Intersection intersection = getIntersection(ray, (TriangleObject) obj, model);
       final boolean match = intersection.isMatch();
       if (match) {
         ++matchCount;
       }
       if (match && intersection.getDistance() < result.getDistance()) {
         result = intersection;
       }
     } else if (obj instanceof SphereObject) {
       Intersection intersection = getIntersection(ray, (SphereObject) obj, model);
       final boolean match = intersection.isMatch();
       if (match) {
         ++matchCount;
       }
       if (match && intersection.getDistance() < result.getDistance()) {
         result = intersection;
       }
     }
   }
   result.setIntersectionCount(matchCount);
   return result;
 }
Exemplo n.º 3
0
 private static int findColor(Intersection hit, Camera cam, Model model) {
   if (hit.isMatch()) {
     RealVector light = LightCalculations.computeLight(cam.getFrom3(), model, hit, 0);
     return toColour(light);
   }
   return 0;
 }
Exemplo n.º 4
0
 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;
 }
Exemplo n.º 5
0
 private static Intersection getIntersection(Ray ray, TriangleObject obj, Model model) {
   Vector3D p0 = VectorUtils.toVector3D(ray.getP0());
   Vector3D p1 = VectorUtils.toVector3D(ray.getP1());
   Vector3D a = obj.getA();
   Vector3D b = obj.getB();
   Vector3D c = obj.getC();
   Vector3D n = obj.getN();
   double den = p1.dotProduct(n);
   if (den != 0.0) {
     double t = (a.dotProduct(n) - p0.dotProduct(n)) / den;
     if (t < EPSILON) {
       return new Intersection(false);
     }
     Vector3D p = p0.add(p1.scalarMultiply(t));
     Vector3D pc = p.subtract(c);
     final Intersection intersection = getIntersection(obj, p, pc);
     if (intersection != null) {
       intersection.setDistance(t);
       return intersection;
     }
   }
   return new Intersection(false);
 }