Returns the volume of the microvoxel containing a variable such as P.
float volume(vector pos)
Note
This function relies on the fact that VEX “knows” that P has
derivatives (dPdu, dPdv, and dPdz).
Passing a literal vector instead of a special variables such as P
will return 0 since VEX will not be able to access the derivatives.
You can specify optional parameters
to control the computation. The optional parameter "extrapolate"
controls whether to do derivative extrapolation at the edges.
Examples
Return the volume of the current micro-voxel in camera space:
volume(P)
Returns 0, since the argument is not a variable VEX knows the derivatives for:
volume({0.1, 2.3, 4.5})