Houdini 20.5 Nodes Geometry nodes

COP Preview Material geometry node

Applies a preview material to geometry.

This node applies a standard preview material to the incoming geometry. Most materials require uvs to be present for useful results.

Some material properties, like normal maps, require tangent information. If these are not present on the incoming geometry, Mikkt tangents will be computed. Note that Mikkt tangents are slow to build and should always be be built BEFORE deformations are applied to the geometry, so this node might be too late in the pipe.

The preview material’s parameters can be overridden by files or references to COP nodes.

Parameters

Group

The primitives to attach the material to.

Material

Base

Base Color Group

Source

How to source the base color: from file, COP, or a constant.

Color File

An RGB image file to use as the base color.

Base Color COP

An RGB COP layer to use as the base color.

Base Color

A constant base color.

Tint With Cd

Multiply the base color with the Cd attribute, allowing tinting with attributes.

Metalness Group

Source

How to source the metalness: from file, COP, or a constant.

Metalness File

A Mono image file to use as metalness.

Metalness COP

A Mono COP layer to use as metalness.

Metalness Scale

A global scale to the metalness.

Metalness

A constant metalness.

Specular

Specular Group

Source

How to source the specular amount: from file, COP, or a constant.

Specular File

A Mono image file to use as specular amount.

Specular COP

A Mono COP layer to use as specular amount.

Specular Amount

A constant specular amount.

Index of Refraction

The index of refraction to use for the material. Even if it is not transmissive, this affects the specular computation.

Spec Color Group

Source

How to source the specular color: from file, COP, or a constant.

Color File

An RGB image file to use as specular color.

Color COP

An RGB COP layer to use as specular color.

Specular Color

A constant specular color.

Specular Roughness Group

Source

How to source the specular roughenss: from file, COP, or a constant.

Roughness File

A Mono image file to use as specular roughness.

Roughness COP

A Mono COP layer to use as specular roughness.

Roughness Scale

A global scale on specular roughness.

Specular Roughness

A constant specular roughness.

Coat

Coat Group

Source

How to source the coat amount: from file, COP, or a constant.

Coat File

A Mono image file to use as coat amount.

Coat COP

A Mono COP layer to use as coat amount.

Coat Amount

A constant coat amount.

Coat Color Group

Source

How to source the coat color: from file, COP, or a constant.

Color File

An RGB image file to use as coat color.

Color COP

An RGB COP layer to use as coat color.

Coat Color

A constant coat color.

Coat Roughness Group

Source

How to source the coat roughness: from file, COP, or a constant.

Roughness File

A Mono image file to use as coat roughness.

Roughness COP

A Mono COP layer to use as coat roughness.

Roughness Scale

A global scale on the coat roughness.

Coat Roughness

A constant coat roughness.

Sheen

Sheen Group

Source

How to source the sheen amount: from file, COP, or a constant.

Sheen File

A Mono image file to use as sheen amount.

Sheen COP

A Mono COP layer to use as sheen amount.

Sheen Amount

A constant sheen amount.

Sheen Color Group

Source

How to source the sheen color: from file, COP, or a constant.

Color File

An RGB image file to use as sheen color.

Color COP

An RGB COP layer to use as sheen color.

Sheen Color

A constant sheen color.

Sheen Roughness Group

Source

How to source the sheen roughness: from file, COP, or a constant.

Roughness File

A Mono image file to use as sheen roughness.

Roughness COP

A Mono COP layer to use as sheen roughness.

Roughness Scale

A global scale on sheen roughness.

Sheen Roughness

A constant sheen roughness.

Emission

Emission Group

Source

How to source the emission: from file, COP, or a constant.

Emission File

A Mono image file to use as emission.

Emission COP

A Mono COP layer to use as emission.

Emission Scale

A global scale on emission amount.

Emission

A constant emission amount.

Emission Color Group

Source

How to source the emission color: from file, COP, or a constant.

Color File

An RGB image file to use as emission color.

Color COP

An RGB COP layer to use as emission color.

Emission Color

A constant emission color.

Height And Normals

Normals Group

Source

How to source the normals: from file, COP, or a constant.

Normals File

An RGB image file to use as normal map. These are in offset format.

Normals COP

An RGB COP layer to use as normal map. These are in offset format.

Normal Map Scale

A global scale for the normal maps.

Height Group

Source

How to source the displacement height: from file, or a COP.

Height File

A Mono image file to use as displacement height.

Height COP

A Mono COP layer to use as displacement height.

Height Scale

A global scale on the displacement height. This is required to convert often normalized map cooridinates into object space amounts.

Transmission ( Karma Only )

Transmission Group

Source

How to source the transmission: from file, COP, or a constant.

Transmission File

A Mono image file to use as transmission amount.

Transmission COP

A Mono COP layer to use as transmission amount.

Transmission

A constant transmission amount.

Transmission Color Group

Source

How to source the transmission color: from file, COP, or a constant.

Color File

An RGB image file to use as transmission color.

Color COP

An RGB COP layer to use as transmission color.

Transmission Color

A constant transmission color.

Subsurface Scattering ( Karma Only )

SSS Group

Source

How to source the subsurface scattering amount: from file, COP, or a constant.

Subsurface File

A Mono image file to use as subsurface scattering amount.

Subsurface COP

A Mono COP layer to use as subsurface scattering amount.

SSS Amount

A constant subsurface scattering amount.

SSS Color Group

Source

How to source the subsurface scattering color: from file, COP, or a constant.

Color File

An RGB image file to use as subsurface scattering color.

Color COP

An RGB COP layer to use as subsurface scattering color.

SSS Color

A constant subsurface scattering color.

SSS Radius Group

Source

How to source the subsurface scattering radius: from file, COP, or a constant.

Color File

An RGB image file to use as subsurface scattering radius.

Color COP

An RGB COP layer to use as subsurface scattering radius.

SSS Radius

A constant subsurface scattering radius.

Radius Scale

A global scale on the subsurface scattering radius.

Opacity

Opacity Group

Source

How to source the opacity: from file, COP, or a constant.

Opacity File

A Mono image file to use as opacity.

Opacity COP

A Mono COP layer to use as opacity.

Opacity Scale

A global scale on the opacity.

Opacity

A constant opacity value.

Defaults

If a COP or File is specified as a source, but the file is misisng or the COP is unwired, these defaults control what value is used instead.

Base Color Defaults

Default Color

The base color to use if unwired.

Metalness Defaults

Default Metalness

The metalness to use if unwired.

Specular Defaults

Default Specular

The specular to use if unwired.

Default Color

The specular color to use if unwired.

Default Roughness

The specular roughness to use if unwired.

Coat Deafults

Default Coat

The coat amount to use if unwired.

Default Color

The coat color to use if unwired.

Default Roughness

The coat roughness to use if unwired.

Sheen Defaults

Default Sheen

The sheen amount to use if unwired.

Default Color

The sheen color to use if unwired.

Default Roughness

The sheen roughness to use if unwired.

Emission Defaults

Default Emission

The emission to use if unwired.

Default Color

The emission color to use if unwired.

Transmission Defaults

Default Transmission

The transmission to use if unwired.

Default Color

The transmission color to use if unwired.

Subsurface Scattering Defaults

Default Subsurface

The subsurface scattering amount to use if unwired.

Default Color

The subsurface scattering color to use if unwired.

Default Radius

The subsurface scattering radius to use if unwired.

Opacity Defaults

Default Opacity

The opacity to use if unwired.

See also

Geometry nodes