Using the Preview buttons at the bottom left of the
RPM UI is a quick and easy way to preview single frames of your
Often though you do not need a full size or
full quality render, so to facilitate efficient use of your setup
time RPM allows you to turn off some features of the renderer and
also render a reduced size image for quicker feedback. The 'Preview'
tab in the RPM interface will display the Preview Overrides controls.
Within this rollout there are some general override
settings - such as image size - as well as renderer-specific controls
for the most common renderers, ie: 3dsmax Default Scanline, Mental
Ray. Brazil/Rio, Vray and FinalRender Stage-1. The rendering parameters
that you can disable or set to lower sampling rates depends on the
renderer, but it is features such as Antialiasing, GI, GI sampling,
DOF, DOF sampling, shadows, mapping, motion blur, etc.
Preview Overrides need to
be enabled in the Preview Setup rollout to affect the previews created
with RPM, there is a checkbutton at the top left of the rollout.
The on/off state of this is displayed in the name of the Preview
group at the bottom left of the RPM UI, the group title will read
either 'Preview: O'rides OFF' or 'Preview: O'rides ON' making it
easy to see before you preview if the overrides are enabled or not.
Movie demonstrating using preview overrides with Mental Ray.