warp.volume_sample_grad_f

warp.volume_sample_grad_f(

id: uint64,

uvw: vec3f,

sampling_mode: int32,

grad: vec3f,

) → float

Kernel

Python

Differentiable

Sample the warp.float32 volume given by id and its gradient at the index-space point uvw.

grad receives the gradient of the sampled value with respect to the index-space coordinates uvw (a warp.vec3, zero for warp.Volume.CLOSEST). In kernels, equivalent to volume_sample_grad() with dtype=float.

See volume_sample_grad() for a usage example.