Rigid body notification when Hitting Controller (Question?)

[Eshku]

More of a question due to my lack of understanding.

I have a controller for a player (probably will have more for creatures), I am using PxUserControllerHitReportImpl to allow player to push rigid bodies, this part works perfectly fine, since it works when player is moving, but there is another side to controller collision detection - I also need to know when controller is getting "hit" by a rigid body - be to random box falling from top or a projectile of some sort.

I tried setting up PxSimulationEventCallbackImpl, which detects when rigid bodies collide with each other, but it does not detect collisions with controllers, meaning they do not send any notifications (and also just passing through).

I also tried to make custom filter shader (while also having no idea what I am doing) and it seems like...we cannot do that - is that correct or is it me, messing it up?

So like...how can I get notification when rigid body "hits" controller?

I could use rigid body and control it instead of controller, but I'd prefer to stick with kinematic controller.
I could also use trigger shape and get notified this way - that doesn't seem that bad for performance...but doesn't seem right...

Am I missing something?

[fabmax]

Hmm honestly not sure. So far I also only used the PxUserControllerHitReportImpl (and the PxControllerBehaviorCallbackImpl but I don't think that will help in your case). The way the character controllers work in PhysX is a bit weird because they are not really part of the simulation. Best thing I can recommend you is the PhysX documentation which is quite extensive for character controllers: https://nvidia-omniverse.github.io/PhysX/physx/5.6.0/docs/CharacterControllers.html

[Eshku]

I also tried to make custom filter shader (while also having no idea what I am doing) and it seems like...we cannot do that - is that correct or is it me, messing it up?

I'm guessing we cannot make custom filter shader through JavaScript? Wanted to mess around with it, to see what possibilities it could open. If it is doable - could you show like most simple example (or same thing as default), I'll go from there, need something working to start with.

p.s. found another solution - more straight forward, without additional shapes on controller (no triggers), - by doing overlap tests directly on controllers, which is probably what I'd prefer, if it wasn't so bad on performance.

[fabmax]

I'm guessing we cannot make custom filter shader through JavaScript? Wanted to mess around with it, to see what possibilities it could open. If it is doable - could you show like most simple example (or same thing as default), I'll go from there, need something working to start with.

It should be possible. I have a test / example for the Java version of the library here: PassThroughFilterShaderTest.java. It should work the same way in js. Implement PassThroughFilterShaderImpl.filterShader and register it via PxTopLevelFunctions.setupPassThroughFilterShader(). It's not particularly cheap though. The filter shader can be called a lot of times and calling js callbacks from wasm comes with some overhead and then the js shader is of course also slower than the native/wasm code.

[Eshku]

Welp, hard way it is then.

Trying to implement my own overlap checks to force objects out of a controller I'm...struggling with lots of issues.
Some of them worked around, main one isn't - how do I access "PxGeometryQuery" ? I can see it is part of
[Prefix="physx::"] interface PxGeometryQuery

But PhysX.PxGeometryQuery , PhysX.PxGeometryQuery.overlap doesn't seem to work?
Tried also PhysX._emscripten_bind_PxGeometryQuery_overlap_4, which leads to my favorite RuntimeError: memory access out of bounds

[fabmax]

Typically you do queries on your scene. Something like that:

const queryResult = new PhysX.PxOverlapResult();
const queryShape = new PhysX.PxBoxGeometry(1, 2, 3);

// set this to the position you want your query shape to be:
const queryPose = new PhysX.PxTransform(PhysX.PxIDENTITYEnum.PxIdentity);

// do the actual overlap query
scene.overlap(queryShape, queryPose, queryResult);

console.log('Query hits: ' + queryResult.getNbAnyHits());

[Eshku]

That could potentially work, need to test if it works with kinematic controller shape or if it needs an actual geometry.
My research on scene queries makes me think PxGeometryQuery could be more performant and more universal tool, can we expose it too?

[fabmax]

From looking at it I would say it should be relatively straight forward to expose it. I'm relatively busy at the moment though, not sure when I will be able to do it.

[Eshku]

Not in a hurry, take your time, thanks for help.
I could've helped if I knew anything about it :D

[may-yyy]

Could you share how to use PxSimulationEventCallbackImpl to receive collision notifications between rigid bodies? I have implemented the method, but I am not receiving any collision feedback at all.