obj1 should NOT collide with obj2 but still trigger onBeginContact and collide with obj3

[valueerror]

is there a way to disable collisions for a certain object but still get the onBeginContact event when they collide? 

 

activating sensor is no option because i need the object to still collide with everything else..    using collision groups seems not to work either because if i configure obj1 to not collide with obj2 the onBeginContact event is not fired anymore.

 

 

for now i use a hacky workaround in the onPresolve Event to cancel the collsion response..  but i have the feeling that there is an easier way for that.

 

thx in advance

[valueerror]

well.. the knot in my head didn't get lose yet..

it seems this is not possible since noone could answer this question.

so i let them collide as usual but in the on presolve event i check if bodyA or bodyB are the specific bodies that should collider with everything but with each other only "report" the collision event without the collision response and i csncel the complete collision there...

sounds to complicated for me to be true.. i still think i just overlooked the obvious thin here.