User guide

Control (UI) Default Value Function

disp_height 1 Sets the displacement scale. If disp_height is set without setting

disp_padding, there could be clipping of the resulting displaced

mesh.

autobump Off Autobump puts the high frequencies of a displacement map

into a bump attribute, so fewer subdivision iteration values are

needed.

With autobump set to On, the renderer makes a copy of all

vertices in the mesh prior to displacement Before shading a

point on the displaced surface, the equivalent Pref for that

point on the original surface is found, and the displacement

shader evaluated there.

omitDisplacement Off This is a Katana specific attribute, which blocks displacement

shader creation, and connection to geometry when enabled.

zero_value 0 Sets the shift to the displacement amount, and varies

depending on how the displacement map is generated. A value

of 0 means displacement is always outwards. A value of 0.5

means that displacement values from 0.0 to 0.5 will push

surface points inwards, and values greater than 0.5 will push

outwards.

Ray Flags

opaque On Sets whether the object is opaque or not.

trace_sets None A string of objects for which the geometry assigned in the

node’s CEL attribute won’t evaluate, for selected types of rays.

For this to work, the shader has to recognize, and use, an array

of objects tagged trace_sets.

Ray Flags > sidedness

AI_RAY_CAMERA On Enable or disable double-sided visibility for camera rays.

AI_RAY_SHADOW On Enable or disable double-sided visibility for shadow rays.

AI_RAY_REFLECTED On Enable or disable double-sided visibility for reflections.

AI_RAY_REFRACTED On Enable or disable double-sided visibility for refractions.

2 NODES A-C | ARNOLDOBJECTSETTINGS