GeRayCollider.GetIntersection ()["points"] ???



  • On 29/08/2013 at 08:29, xxxxxxxx wrote:

    From Python SDK:

    Retrieves the intersection, found by GeRayCollider.Intersect(), by index:

    intersection = rc.GetIntersection(id)

    intersect["face_id"] # The polygon index, int
    intersect["tri_face_id"] # If first half of quad or triangle face_id + 1, else -(face_id + 1), int
    intersect["hitpos"] # Position of the intersection, c4d.Vector
    intersect["distance"] # Distance to the intersection, float
    intersect["f_normal"] # Face normal. (Not normalized.), c4d.Vector
    intersect["barrycoords"] #Barrycentric coordinates of the intersection. (x = u, y = v, z = d), c4d.Vector
    intersect["backface"] # True if the intersected face's normal points away from the camera, otherwise False, bool

    the intersection to points, is it possible?



  • On 29/08/2013 at 09:59, xxxxxxxx wrote:

    Originally posted by xxxxxxxx

    the intersection to points, is it possible?

    Please clarify your question, nobody knows what you are talking about. An intersection is
    a point in 3D space, if this is what you mean.



  • On 29/08/2013 at 10:49, xxxxxxxx wrote:

    Hi NiklasR.
    I would like to move an object and the object must target one of the point of another object

    example:

    obj = doc.GetActviveObject()

    obj_target= doc.GetFirstObject()

    I would like to move, with GeRayCollider, obj to obj_target.

    My intersection  would be a point of obj_target points.



  • On 29/08/2013 at 11:49, xxxxxxxx wrote:

    Hi Runner,

    The quote you posted tells you:  intersect["hitpos"] # Position of the intersection, c4d.Vector

    After you have successfully initialized the GeRayCollider and sent a ray through time and space,
    you can use GeRayCollider.GetIntersectionId() to retrieve information about one of the
    intersections the collider figured. The returned value is a dictionary and contains the hit position
    as the documentation states.
        
        import c4d
        
        def main() :
            target = doc.GetFirstObject()
            if not op or not target:
                return
            if not isinstance(target, c4d.PolygonObject) :
                return c4d.gui.MessageDialog("First object must be a polygon object.")
        
            collider = c4d.utils.GeRayCollider()
            if not collider.Init(target) :
                return c4d.gui.MessageDialog("GeRayCollider failed to initialize.")
        
            bd = doc.GetActiveBaseDraw()
            cam = bd.GetSceneCamera(doc)
            cam_mg = cam.GetMg()
        
            ray_p = cam_mg.off
            ray_d = cam_mg.v3
            length = 1000000000
        
            does_intersect = collider.Intersect(ray_p, ray_d, length)
            if not does_intersect:
                return c4d.gui.MessageDialog("No Intersection found.")
        
            inter = collider.GetNearestIntersection()
            mg = op.GetMg()
            mg.off = inter["hitpos"]
            doc.AddUndo(c4d.UNDOTYPE_CHANGE_SMALL, op)
            op.SetMg(mg)
            c4d.EventAdd()
        
        main()

    Usage: Make the first object in the scene editable. Select another object and place the camera
    so that the center directly points on a polygon on the surface of the first object.

    Please note that the documentation (R14.041) is wrong here: The "goal" parameter does not
    only need to be a BaseObject, it even needs to be a PolygonObject. You can convert any object
    to a polygon object, there's plenty information here in the fourm.

    Cheers,
    -Niklas



  • On 29/08/2013 at 13:50, xxxxxxxx wrote:

    Thanks NiklasR :)

    but i have have successfully initialized the GeRayCollider, with intersect["hitpos"]...

    but my object is positioned of polygon surface...

    I want the new op.SetMg(mg) is only points of first object... no surface....  You can only get points from ["hitpos"] library?  
    How?... :)



  • On 08/09/2013 at 16:12, xxxxxxxx wrote:

    Hi Runner,

    I am sorry, but I can not understand what you are saying. Do you want to calculate "intersections"
    with points rather than a polygon surface?

    Best regards,
    -Niklas


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