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

Filename

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

Blur

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

Center

The values around which the bump signal is centered.

RIB: float center

Default: 0.0

Scale

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)

Disabled

Use the geometric normal (ignore the modified bump).

RIB: int disable

Default: 0

Output Parameters

resultN

The bumped normal.