Box2D Shape test

[Outcast]

Do anyone know how to make a box2d object immune to a shape test? I want to check for shapes in an area and destroy all shapes in that area, but some objects should not be destroyed. I have created an example where i create an object that makes a shape test. I tried to make it immune to this by using a flag, but I guess the flag I use is checking the actual flag of the box2d extension and not the object?

How can I do this so the object is not destroyed by the shape test?

[Outcast]

bump.

[BigHatLogan]

That file require FlashFx.mfx so I assume it need flash exporter. Can you make example for PC runtime?

[Outcast]

That file require FlashFx.mfx so I assume it need flash exporter. Can you make example for PC runtime?

Oh crap, thanks for pointing that out! I have made an updated example here for regular runtime. I also added some red boxes. You press the left button to spawn a "bomb" (the blue object). It will detonate and destroy all boxes in an area. What I want is that the blue box should not be destroyed however. I want to make that object "immune" to the shape test.

[BigHatLogan]

Yeah, testing for flag this way is not going to work. But you can change collision type of the "bomb" and test for that in shape test event. Also if you want it to be a bit more precise than the shape test ( that is box shape) you can create actual new circular body as a sensor and test for collision with that. I upload both examples, so I hope one of them to be helpful.

[Outcast]

Wow thanks that is awesome!

[Outcast]

I actually seem to have stumbled on a bug with the flash version of box2d. I added an event to destroy the bomb when it detonates, but that does not work if you build it for flash.

[Outcast]

Ok I found a workaround by destroying the bomb by activating a group that works in Flash. But now I found another bug in the flash version :P If you use qualifiers instead for checking for shapes (which I do in the real app because there are different physics objects that should be destroyed) it does not work in the flash version.