Volume VOP Parameter via Primitive Attribute

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Hi there,

is it possible that the Volume VOP cannot import parameters via the parameter node on a primitive or point basis?

If I do f.e. the following:

- create a volume, initial value 1
- attribCreate, let's say rand($PR) or a static value 0.3 -> my_var
(details view clearly shows the attribute)
- add a volume vop (let's ignore the warning and let it bind density)
- add a parameter node inside the volume vop, name it my_var
- create some turbulent noise and multiply it by my parameter, pipe it back out to density

-> result: piped-in parameter gets ignored. no matter if it's a vertex, point, primitive or detail attribute. Only the parameter default value in the Volume VOP is used.

if I do something similar with a box, some attribCreated-point values and a VOP SOP with “Displace Normals”, it works just fine.

Is this some basic limitation of volumes? it lists a primitive, but there is actually not really one, because it's a 3D-field?
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