PxrBump used to provide the secondary bump on displaced LMPlastic tiles.

Produces a bumped normal from a bump map (a scalar displacement map, so only the first channel is used for the displacement). Bumps are applied in object space. The change in scale between object space and current space is automatically applied by the node.

Texture atlas format files can be read in either UDIM (Mari) format or Mudbox format. This plugin also supports Rtx procedural texture plugins.

Input Parameters

Input Bump

If Input Bump is connected (and Filename is not specified), the pattern executes the upstream shader graph connected to Input Bump three times, once at the shading point and once at P+du and P+dv. Then it crosses the results to get the bump normal.

Note that if you have a fixed texture and UV, it is highly recommended to use "Filename" method below because it is 3 times faster!

If Filename is specified below, Input Bump is ignored.

RIB: float inputBump
Default: 0.0


The filename of the texture. If not provided, Input Bump is used instead.

If Filename is specified, the pattern has no upstream graph connected. Instead it reads the bump value from the texture file. The input file can be a color or monochrome file; if the file is RGB, only a single channel (as specified by the First Channel Offset parameter) is read. The bump pattern gets the derivatives from the texture AS it filters it, which provides a performance benefit over using Input Bump.

The PxrBump pattern currently does not allow modifying the manifold of the texture.

RIB: string filename
Default: ""

First Channel Offset

First channel offset to be looked up for Filename.

RIB: int firstChannel
Default: 0

Atlas Style

Specifies the style of texture atlas that is being used. If you specify an atlas style, the Filename parameter must contain a _MAPID_, which will be substituted automatically according to the surface parameterization and the style of atlas. Valid styles are:

  • 0: None
  • 1: MARI
  • 2: Mudbox
RIB: int atlasStyle
Default: 0

Invert T

Inverts the t texture coordinate for texture lookup.

RIB: int invertT
Default: 1


Specifies how much to blur the result from the texture.

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

Input Normal

An additional normal to be added to the bump normal.

RIB: normal inputN
Default: 1.0 0.0 0.0


The values around which the bump signal is centered.

RIB: float center
Default: 0.0


An object-space scale applied to the bump.

RIB: float scale
Default: 1.0

Reverse Normal

Reverse the resulting normal.

RIB: int reverse
Default: 0 (i.e. don't reverse the resulting normal)


Use the geometric normal (ignore the modified bump).

RIB: int disable
Default: 0

Output Parameters


The bumped normal.