volumesamplep

vector4  volumesamplep(<geometry>geometry, int primnum, vector pos)

vector4  volumesamplep(<geometry>geometry, string volumename, vector pos)

<geometry>

When running in the context of a node (such as a wrangle SOP), this argument can be an integer representing the input number (starting at 0) to read the geometry from.

Alternatively, the argument can be a string specifying a geometry file (for example, a .bgeo) to read from. When running inside Houdini, this can be an op:/path/to/sop reference.

Returns

The volume primitive’s sampled value at the given position. Values between voxels will be trilinearly interpolated.

For scalar volumes and vdbs, if Cd is the volumename, the function will try to evaluate Cd.x, Cd.y, Cd.z, and Cd.w and report the joined values. (rgba can also be used as extensions)

Returns 0 if primnum or inputnum is out of range, the geometry is invalid, or the given primitive is not a vdb or volume primitive.