Provides access to per-face texture (ptex) files. Unlike other texture nodes, this texture always operates over the default parameterization on the surface. There is no manifold to be provided, instead a special primitive variable called __faceindex is used.

Input Parameters


The filename of the texture. This parameter must be supplied.

RIB: string filename
Default: ""

First Channel Offset

Offsets the first channel to be looked up.

RIB: int firstChannel
Default: 0

Face Index Offset

If you have put more than one set of data into a ptex file, you can offset the index by the known amount.

RIB: int faceIndexOffset
Default: 0


Selects different reconstruction filters that can be used during texture lookup. The filters available for PxrPtexture are:

  • 0: Nearest
  • 1: Box
  • 2: Bilinear
  • 3: Bspline
  • 4: Mitchell
  • 5: Catmullrom
  • 6: Gaussian
  • 7: Lagrangian
RIB: int filter
Default: 1


Specifies how much to blur the image retrieved from the ptex file.

RIB: float blur
Default: 0.0

Mip Interpolate

Selects whether to interpolate between adjacent resolutions in the multi-resolution texture, resulting in smoother transitions between levels.

RIB: int lerp
Default: 1

Missing Color

If there is an error opening the texture, use this color.

RIB: color missingColor
Default: 1.0 0.0 1.0

Missing Alpha

If there is an error opening the texture, use this alpha.

RIB: float missingAlpha
Default: 1.0


Apply the reverse sRGB transform your texture. If you are painting textures in sRGB space (default for most paint packages) but viewing your data in data linear space, your textures will look washed out. This will apply the sRGB transform to your texture, which should make it appear visually linear again.

RIB: int linearize
Default: 0

Output Parameters


The filtered color result. Note all results are looked up starting at the startChannel offset.


The R channel result


The G channel result


The B channel result


If alpha is present and resultRGB is connected it returns the channel after RGB. If RGB is not connected it returns the first channel.