Houdini 11 VEX VEX functions

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

  1. float Du(float )

  2. vector Du(vector )

  3. vector4 Du(vector4 )

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

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

You can specify optional parameters to control the computation.

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