# Tabulated phase function (irregular angular grid) (tabphase_irregular)#

Parameter

Type

Description

Flags

values

string

A comma-separated list of phase function values parameterized by the cosine of the scattering angle. Must have the same length as nodes.

P, , D

nodes

string

A comma-separated list of $$\cos \theta$$ specifying the grid on which values are defined. Bounds must be [-1, 1] and values must be strictly increasing. Must have the same length as values.

P, , D

This plugin implements a generic phase function model for isotropic media parametrized by a lookup table giving values of the phase function as a function of the cosine of the scattering angle.

This plugin is a variant of the tabphase plugin and behaves similarly but uses an irregular distribution internally. Consequently, tabphase performs better for evaluation and sampling.