Raytrace Motion Blur 

This attribute enables or disables motion blur for traced rays. For example, a moving object as seen in a mirror will only show motion blur if this option is enabled.

Raytrace Displacements

When this attribute is checked, it enables ray tracing of true geometric displacements. The default is to ray-trace displacements as bump maps (a displaced surface appears bump mapped in a mirror reflection). Enabling this feature makes ray tracing slower and forces 3delight to use more memory so this option should be used with care.

Raytrace Bias

Specifies a bias for rays starting point to avoid potentially erroneous intersec- tions with emitting surface. The default value is ‘0.01’.

Trace subset

This attribute is used to select one or several Maya object sets that is used to narrow down what objects are visible to ray traced rays. This feature can be useful when a scene is using referenced objects that already have their "Trans- mission" attribute correctly set, but only part of these objects are needed to be visible to ray traced rays in this specific scene. The "Trace subset" option menu has the following values available:

‘All Objects’

ll objects whose "Transmission" and "Visible To Reflections" at- tributes have been properly set will be visible to ray traced rays. This is the default.

‘Objects in selected sets’

Only objects in the selected Maya sets and whose "Transmission" and "Visible To Reflections" attributes have been properly set will be visible to ray traced rays. The "Select Sets" button can be used to select the desired Maya sets to include.

‘Objects not in selected sets’

Only objects that are not in the selected Maya sets and whose "Transmission" and "Visible To Reflections" attributes have been properly set will be visible to ray traced rays. The "Select Sets" button can be used to select the desired Maya sets to exclude.