Manifold

Frequency

The frequency at which the texture will repeat. A value of 1 indicates that the texture will not repeat.

 

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title Tech Notes
RIB float frequency Default 1.0

 

Transition Width

The filename of the texture for the Y axis. This parameter must be supplied if you chose to project 3 textures.

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title Tech Notes
RIB float transitionWidth Default 0.5

Pref

The name of the reference position primvar (Maya uses __Pref). The position reference may be used to keep the texture anchored to the surface while the object is deforming. If your deforming object is textured with PxrRoundCube, you need __Pref AND __Nref !

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title Tech Notes
RIB string pref Default ""

Nref

The name of the reference normal primvar (Maya uses __Nref). The normal reference may be used to keep the texture anchored to the surface while the object is deforming. If your deforming object is textured with PxrRoundCube, you need __Nref AND __Pref ! 

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title Tech Notes
RIB string nref Default ""

 

Coordinate System

Name of coordinate system transform (e.g. place3dtexture node in Maya). You can either use one of the predefined spaces ("world", "object", "current", etc) or the name of a coordinate system node in your scene. If empty, PxrRoundCube use "object" space.

 

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title Tech Notes
RIB string coordsys Default ""

 

Use Undisplaced Position

When an object is displaced using PxrRoundCube, textures used during shading by the bxdf will not line up correctly with regard to the displacement map. The reason is simple : the displacement shader has moved P and the patterns attached to the bxdf are using the displaced P instead of the original. To avoid this problem, enable useUndisplacedPosition and the pattern will use the undisplaced position (Po) instead of the current position (P). Note that, under the hood, PxrRoundCube also uses the original normal (Non) instead of the current normal (N) when this is enabled.

 

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title Tech Notes
RIB int useUndisplacedPosition Default 0

 

Randomize

Sometimes, it is useful to randomize some of the parameters to make things look more natural...

Random Source

For each object to get a different variation, you need to select something unique about them to create a unique seed. You have a choice between the object's id and the object's name. These attributes are created by the software outputing the RIB and depending on your host, one may work better than the other.

• 0: Object id (Attribute "identifier" "float id")
• 1: Object Name (Attribute "identifier" "string name")

int randomSource

0

Extra Seed

When set to zero, all PxrRoundCube patterns operating on the same node will compute the same random seed. If you want one of these patterns to compute a different variation, set the randomExtraSeed to a non-zero value.

float randomExtraSeed

0.0

Random Orientation

Set this parameter to 1 to randomly rotate the tri-planar projection. By default, the axes will be in object-space. This means that 3 spheres with the same PxrRoundCube pattern will look exactly the same. When you randomize the axes' orientation, they all look different, even though they might have the same transform. Typically, this is useful to control random variations of a lot of objects (think "rocks on the ground") from a single source.

int randomOrientation

0

Random Flip

This switch will randomly flip st coordinates of each axis of the tri-planar projection.

int randomFlip

0

Random Offset

This switch will randomly offset st coordinates of each axis of the tri-planar projection. You should probably make sure seams are not visible your texture is tiling.

int randomOffset

0

int enableX

1

float scaleSX

1.0

float scaleTX

1.0

float offsetSX

0.0

float offsetTX

0.0

float invertSX

0.0

float invertTX

0.0

float swapSTX

0.0

float pivotSX

0.0

float pivotTX

0.0