Dv VEX function

Takes the derivative of the given value with respect to V.

Contexts: cop, displace, fog, light, photon, shadow, surface

  1. float Dv(float )

  2. vector Dv(vector )

  3. vector4 Dv(vector4 )

Takes the derivative of the given value with respect to V.

In shading contexts, this is the change in the variable over the area being shaded.

You can specify optional parameters to control the computation.