CF_NO_CONTACT_RESPONSE not honored if setSplitIslands set false

What steps will reproduce the problem?
1. Create a dynamics world (I was using btDiscreteDynamicsWorld).
2. Call getSimulationIslandManager()->setSplitIslands(false) on the world.
3. Create some number of objects with the flag CF_NO_CONTACT_RESPONSE.
4. Note that collisions with said objects impart impulse.

What is the expected output? What do you see instead?
Objects with the CF_NO_CONTACT_RESPONSE flag should not impart or receive 
impulse from other objects.

What version of the product are you using? On what operating system?
2.82-rev2704

Please provide any additional information below.
The problem seems to lie with 
btSimulationIslandManager::buildAndProcessIslands. In the case that 
m_splitIslands is FALSE, the entire list of manifolds is sent to the 
processIsland function of the callback. I am attaching a patch that seems to 
fix the issue by using the m_islandmanifold array to hold a list of only those 
objects that pass the needsResponse check. That was already the process with 
the default setting for split islands.

Original issue reported on code.google.com by drei...@atariland.net on 21 Mar 2014 at 4:06

Attachments:

no_contact_response_2.82.patch

mettli / bullet

CF_NO_CONTACT_RESPONSE not honored if setSplitIslands set false #800