Houdini 16.5 Nodes VOP nodes

Anti-Aliased Noise VOP node

Generates anti-aliased noise by using the derivative information of the incoming position to compute band-limited noise.

This operator generates anti-aliased (fractional brownian motion) noise by using the derivative information of the incoming position to compute band-limited noise. This type of noise is ideal for shading.

The roughness parameter determines the coarseness of the noise. The maxoctaves parameter limits the noise to a fixed number of iterations.

The amplitude parameter is a scale factor on the resulting noise. The default output range of noise is -0.5 to 0.5.

Make sure at least the Position (pos) input is connected in order to notice any noise. The easiest way to accomplish this is to pipe the global variable P into the pos input. However, the global variable is in camera space, so noise will move through the surface.

To fix this use the Rest Position VOP (for deforming geometry) or simply transform the position to object space using the Transform VOP.

Connect the noise output to the Color Mix bias or to Displace Along Normal to obtain interesting results. The options are boundless.

See also

VOP nodes