---
title: "PxrThinFilm"
canonical: "https://rmanwiki-25.pixar.com/space/REN25/20415860/PxrThinFilm"
format: markdown
---
Computes a thin-film interference effect on six spectral bands.

### Input Parameters

#### Input Color

The color that will be perturbed by the interference effect.

#### Eta

The index of refraction of the thin film. We assume the exterior medium is air.

#### Spread

The index of refraction's amount of variation across the color spectrum.

#### Thickness

The thickness of the thin film in nanometers.

#### Thickness Scale

Connect a pattern here to modulate the thickness. This will multiply the *thickness* value.

#### Front Only

Compute only interference on front-facing points. By default, both sides are computed.

### Output Parameters

#### resultRGB

The color result.

#### resultR

The R channel from the resultRGB output.

#### resultG

The G channel from the resultRGB output.

#### resultB

The B channel from the resultRGB output.