@Override
public boolean intersectsSphere(final BoundingSphere bs) {
if (!Vector3.isValid(_center) || !Vector3.isValid(bs._center)) {
return false;
}
final Vector3 diff = _compVect1.set(getCenter()).subtractLocal(bs.getCenter());
final double rsum = getRadius() + bs.getRadius();
return (diff.dot(diff) <= rsum * rsum);
}
@Override
public boolean intersectsBoundingBox(final BoundingBox bb) {
if (!Vector3.isValid(_center) || !Vector3.isValid(bb._center)) {
return false;
}
if (Math.abs(bb._center.getX() - getCenter().getX()) < getRadius() + bb.getXExtent()
&& Math.abs(bb._center.getY() - getCenter().getY()) < getRadius() + bb.getYExtent()
&& Math.abs(bb._center.getZ() - getCenter().getZ()) < getRadius() + bb.getZExtent()) {
return true;
}
return false;
}
/**
* Calculates the distance from a spatial to the camera. Distance is a squared distance.
*
* @param spat Spatial to check distance.
* @return Distance from Spatial to current context's camera.
*/
protected double distanceToCam(final Spatial spat) {
if (spat._queueDistance != Double.NEGATIVE_INFINITY) {
return spat._queueDistance;
}
final Camera cam = Camera.getCurrentCamera();
if (spat.getWorldBound() != null && Vector3.isValid(spat.getWorldBound().getCenter())) {
spat._queueDistance = spat.getWorldBound().distanceToEdge(cam.getLocation());
} else {
final ReadOnlyVector3 spatPosition = spat.getWorldTranslation();
if (!Vector3.isValid(spatPosition)) {
spat._queueDistance = Double.POSITIVE_INFINITY;
} else {
spat._queueDistance = cam.getLocation().distance(spatPosition);
}
}
return spat._queueDistance;
}
@Override
public boolean intersects(final ReadOnlyRay3 ray) {
if (!Vector3.isValid(_center)) {
return false;
}
final Vector3 diff = ray.getOrigin().subtract(getCenter(), _compVect1);
final double radiusSquared = getRadius() * getRadius();
final double a = diff.dot(diff) - radiusSquared;
if (a <= 0.0) {
// in sphere
return true;
}
// outside sphere
final Vector3 dir = _compVect2.set(ray.getDirection());
final double b = dir.dot(diff);
if (b >= 0.0) {
return false;
}
return b * b >= a;
}
