problem with GeRayCollider [Solved]
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On 17/06/2015 at 10:40, xxxxxxxx wrote:
Hi all,
I've problems getting the GeRayCollider work correctly in my scene:
As a simple test I create a sphere as target object and position the sphere in (0,0,0). First GeRayCollider gives me correct hits on this sphere. Its also working when I move my source object which is my starting point for the "Intersect" method: the collision coordinates are moving accordingly.
But when I move the target object I still get the collision hits on the place where the sphere was located before. Do I have to call anything after moving the target geometry in order to update GeRayCollider ?
regards,
Jens -
On 17/06/2015 at 12:52, xxxxxxxx wrote:
Hi Jens,
the GeRayCollider works in local space of the target object.
Transferring the start position to local space and the hitpoints back to global space should work.
Please give this script a try.
Hope this helps!
Best wishes
Martinimport c4d from c4d import utils ############################################################################ # sample implementation of GeRayCollider # # You´ll need a linear spline object with two points (called "LINE") # # and an object to test the script # ###########################-by-monkeytack-################################## ############################################# def Triangulate(op) : #convert and triangulate doc = op.GetDocument() if op.GetType() !=c4d.Opolygon: virtualop = utils.SendModelingCommand(command=c4d.MCOMMAND_CURRENTSTATETOOBJECT, list=[op.GetClone()], doc=doc) if not virtualop: return #it was not possible to convert the object else: virtualop = [op.GetClone()] obj = utils.SendModelingCommand(command=c4d.MCOMMAND_TRIANGULATE, list=[virtualop[0]], doc=doc) if not obj: return #it was not possible to triangulate the object return virtualop[0] ############################################# def Intersect_Rc(obj,p0,p1) : ray = utils.GeRayCollider() ray.Init(obj, True) matr = obj.GetMg() #transfer line points to local coordinates of the object #as the ray collider works in local space of the object pOlocal = p0 * ~matr p1local = p1 * ~matr ldir = p1local-pOlocal direction = ldir.GetNormalized() raylength = ldir.GetLength() CollisionState = ray.Intersect(pOlocal, direction, raylength) erg = [] count= ray.GetIntersectionCount() print count if count >0: for i in xrange(count) : result = ray.GetIntersection(i)["hitpos"] #transfer hitpoints back to global coordinates result = result * matr erg.append(result) return erg else: return def main() : #validate object to calculate if not op:return ##triangulate obj = Triangulate(op) if not obj:return if not obj.IsInstanceOf(c4d.Opolygon) :return #R16 else GetType() #-------------------------------------------- #validate line/ray to check LINE=doc.SearchObject("LINE") if not LINE: return p0l = LINE.GetPoint(0) p1l = LINE.GetPoint(1) Lmatr = LINE.GetMg() ##global points of the line p0 = p0l*Lmatr p1 = p1l*Lmatr #-------------------------------------------- #call intersection function erg = Intersect_Rc(obj,p0,p1) #-------------------------------------------- #insert test objects if collision appears if erg: for i in xrange(len(erg)) : sphere = c4d.BaseObject(c4d.Osphere) sphere[c4d.PRIM_SPHERE_RAD] = 10 doc.InsertObject(sphere) sphere.SetAbsPos(erg[i]) #-------------------------------------------- c4d.EventAdd() if __name__=='__main__': main() -
On 17/06/2015 at 15:58, xxxxxxxx wrote:
Hi Martin,
thanks a lot for the explanation and your very helpful code example !!
I should have read the manual a little more careful: **
parameters of "intersect" method:
** ray_p (Vector) – Start point of the ray in object coordinates
ray_dir (Vector) – Ray direction in object coordinates. ****best regards,
Jens