Kinematic Body Triggers

[jamesm6162]

Hi

This topic has been discussed before, but unfortunately I have one run into a problem with using Kinematic bodies as triggers. I need to move a kinematic body around and detect collisions with dynamic bodies as well as static bodies.

Right now the dgBroadPhase::TestOverlaping function does not allow kinematic bodies to collide with bodies with no mass (tier5 and tier6 conditions).

What can I do to get these contacts? I don't want the dynamic bodies to react to the kinematic trigger body.

[Julio Jerez]

this is by design. if I allowed kinematic bodies collision with dynamics static bodies that cause singularities for the solver, as it will try to solve collision between two static bodies.

why would you want contact form kinematic body and a static dynamics body?

[jamesm6162]

Well I use the kinematic body to test for overlap. It's just sensors that should detect whether you are are close to any walls or other objects, like for example in a tunnel. The physical bodies are not touching yet, but I need to know whether these 'ghost' sensors are.
I don't want to use raycasts as there are too many different directions.

[Julio Jerez]

I do no remember by I believe that kinematic body with mass, do collide.
In the advance player controller demo there are triggers that detent the player which is a kinematic body with mass. Try that see if it works

The other thing you could do if the above does no work, is that you can use a dynamics body,
and assign a material that in the call back reject all contacts but the signal you first.
That how trigger where made before 3.00

[Bird]

I need to move a kinematic body around and detect collisions with dynamic bodies as well as static bodies.

I do that in my project by using

NewtonWorldForEachBodyInAABBDo() to get a list of bodies whose AABB intersect the trigger and then use NewtonCollisionIntersectionTest() in the NewtonWorldForEachBodyInAABBDo callback to determine if the bodies actually intersect or not.

-Bird

[jamesm6162]

Thanks for the suggestions. I will see which works best for me.