ContactFilter ignores categories and maskbits
Opened this issue · 1 comments
GoogleCodeExporter commented
What steps will reproduce the problem?
1. Set the contact filter for 2 bodies so that they are in the same group, but
two different maskbits (should not collide)
2. b2ContactFilter has a hardcoded 'returns true' for should collide, exiting
the function before the category <--> maskbits comparison occurs.
What is the expected output? What do you see instead?
Setting the categorybits & maskbits of a body should behave as it does in
box2d/box2d-as3
What version of the product are you using? On what operating system?
2.1a -
Please provide any additional information below.
Original issue reported on code.google.com by onedayit...@gmail.com on 12 Sep 2011 at 2:28
GoogleCodeExporter commented
From section 6.2 in the box2D Manual
(http://www.box2d.org/manual.html#_Toc258082972), right below the last grey box
before section 6.3: "group filtering has higher precedence than category
filtering".
I interpret this so that members of a positive-number-group will always
collide, and members of a negative-number-group will never collide, regardless
of category and mask-bits.
Original comment by karl.ner...@googlemail.com on 1 Mar 2012 at 12:35