PxRigidDynamic with Skeleton

[rossetti73]

Hi ,
Is possible something similar Skeleton on object PxRigidDynamic?

i check many example but all create many object PxRigidDynamic and after modify setKinematicTarget but i want only one mesh with many target to simulate skeleton .

is possible thanks ?

[preist-nvidia]

Hi @rossetti73,

If I understand you correctly, you want to animate a triangle mesh that then collides with the environment? We only support this on CPU and only for static colliders at the moment, see: https://github.com/NVIDIA-Omniverse/PhysX/blob/main/physx/snippets/snippetdeformablemesh/SnippetDeformableMesh.cpp

For dynamics we have a GPU-accelerated feature planned, but it is not released yet.

Philipp

[preist-nvidia]

I am sorry, I am mistaken, the feature is already released. The kinematic softbody snippet does exactly what you need: https://github.com/NVIDIA-Omniverse/PhysX/tree/main/physx/snippets/snippetkinematicsoftbody

But yes, this feature is GPU only and will remain so.

[rossetti73]

thanks for replay So no way to use RigidDynamic? because use softbody not possible use all mesh need prepare and modify to made softbody

i try update RigidDynamic like SnippetDeformableMesh.cpp update position in render but collision with cloth not update !!
Only way i find to update RigidDynamic is complete remove and remade with new position in this way work but is very slow!!!
not way to update position of RigidDynamic in GPU?

thanks for any help

[preist-nvidia]

Why is creating a softbody an issue? That's your best option to make this work with cloth.

Yes, the deformable mesh feature is only for rigid statics, and will also not work with GPU features like particle cloth.

[rossetti73]

About Create soft body i have this manikin with also animation

This is many mesh not connected .
So when i cook mesh for softbody not work i need before simplify mesh also connect.
If in blender connect my manikin and simplify still many position and to cook it many time !!

About collision with RigidDynamic work in GPU and very easy to cook and faster !!

i cook with
params.buildGPUData = true; //rigid body collide in GPU

but my problem i can't update position, if try update lost collision, because i think not update position in gpu.

but if delete actor in scene, and cook mesh in new position, and put again in scene actor, work but for animation is very slow!!

for this reason i ask is possible update position of RigidDynamic in GPU . (GPUDATA)

If now no, do you think in the future add it ?

In flex is possible i do it :)

Thanks .

[preist-nvidia]

Yes, reinserting into the scene will be very slow - that's why the best option is the softbody approach.

An alternative is to approximate the collision shape of the skeleton with primitive shapes, or convex hulls of the mesh components, and then drive the visual mesh from the skeleton. But that will be more work than fusing the mesh for kinematic softbody I think.