bool Manipulator::canManipulate(Ray3f ray,Box3f box,Mat4f* T)
{
//nothing to do
if (!box.isValid())
return false;
Vec3f size=box.size();
Mat4f Direct=(*T) * getTransformationToBox(box);
Mat4f Inverse=Direct.invert();
// the ray is in world coordinate
Vec3f P1=Inverse * (ray.origin );
Vec3f P2=Inverse * (ray.origin+ray.dir);
// should be the unit bounding ball not the bounding box, but seems good enough (probably better)
// is objects does not overlap too much!
float epsilon=1e-4f;
Box3f unit_box(
Vec3f(
size[0]?-1:-epsilon,
size[1]?-1:-epsilon,
size[2]?-1:-epsilon),
Vec3f(
size[0]?+1:+epsilon,
size[1]?+1:+epsilon,
size[2]?+1:+epsilon));
float tmin,tmax;
return (Ray3f(P1,P2-P1).intersectBox(tmin,tmax,unit_box) && tmin>0);
}
void Manipulator::setObject(Box3f box,Mat4f* T)
{
this->T=T;
this->box=box;
this->ref=INVALID;
this->bRunning=false;
if (box.isValid())
this->T_to_box=getTransformationToBox(box);
}