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[BUG] XPBD Integrator zero gradients in examples
Bug Description
Target variable has no gradient in cloth_throw and softbody_properties examples when using XPBDIntegrator, so the optimization has no effect. SemiImplicitEuler integrator produces proper gradients. What is the cause of this issue here? Thanks!
System Information
Warp version: 1.7.1, python 3.11