/**
* Intersect the given Ray with this shape. Tests for every triangle of the shape. Speed depends
* hence on the complexity of the shape.
*
* @param Ray ray The Ray to be intersected
* @param Matrix4f transformation The transformation of the Shape into its actual position
* @return a RayShapeIntersection with the coordinates of the HitPoint if any.
*/
public RayShapeIntersection intersect(Ray ray, Matrix4f transformation) {
RayShapeIntersection intersection = new RayShapeIntersection();
List<RayShapeIntersection> hitTriangles = new ArrayList<RayShapeIntersection>();
// get all triangles
Iterator<Triangle> it = getTriangles().iterator();
Triangle triangle;
// calculate intersection of ray and triangle
while (it.hasNext()) {
triangle = it.next();
triangle.transform(transformation);
intersection = calculateIntersection(ray, triangle);
if (intersection.hit) {
hitTriangles.add(intersection);
}
}
Vector3f distance = new Vector3f();
float shortestDist = Float.MAX_VALUE;
for (RayShapeIntersection in : hitTriangles) {
distance.sub(ray.getOrigin(), in.hitPoint);
if (distance.length() < shortestDist) {
intersection = in;
shortestDist = distance.length();
}
}
// return the intersected point if any
return intersection;
}
