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When creating certain mechanisms that use killers I find annoying when it just destroys everything so here is my suggestion
On the collision group menu box there should be a check/uncheck box next to every collision group. This would help when you want an object to collide with groups A,B and C but you only want it to kill group C and leaves groups A and B unaffected. What do you think?

definitely an interesting proposal. I support.

You can just make it two objects. Make an object that collides with A and B, clone that and make the clone be a killer and collide with C. There. Problem solved.

RicH wrote:You can just make it two objects. Make an object that collides with A and B, clone that and make the clone be a killer and collide with C. There. Problem solved.

What he said.

RicH wrote:You can just make it two objects. Make an object that collides with A and B, clone that and make the clone be a killer and collide with C. There. Problem solved.

This. There is no need for a new feature, the current version can handle this just fine by simply choosing the appropriate collision groups...