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.
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 inputBumpDefault: 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 filenameDefault: ""
First Channel Offset
First channel offset to be looked up for Filename.RIB: int firstChannelDefault: 0
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: MudboxRIB: int atlasStyleDefault: 0
Inverts the t texture coordinate for texture lookup.RIB: int invertTDefault: 1
Specifies how much to blur the result from the texture.RIB: float blurDefault: 0.0
Selects whether to interpolate between adjacent resolutions in the multi-resolution texture, resulting in smoother transitions between levels.RIB: int lerpDefault: 1
An additional normal to be added to the bump normal.RIB: normal inputNDefault: 1.0 0.0 0.0
The values around which the bump signal is centered.RIB: float centerDefault: 0.0
An object-space scale applied to the bump.RIB: float scaleDefault: 1.0
Reverse the resulting normal.RIB: int reverseDefault: 0 (i.e. don't reverse the resulting normal)
Use the geometric normal (ignore the modified bump).RIB: int disableDefault: 0
The bumped normal.