...
This option is only available when using the 'Path Tracer' Render Engine. When this toggle is turned on, the rendering rapidly shows a coarse image and refines it progressively until completed. This option is effective only for images outputted directly to a window on screen (i.e. to the Maya Render View or to 3Delight i-Display). During batch rendering (i.e. when using Maya Batch) this option is ignored. Note that this is not required when rendering in Maya IPR, which is progressive by nature and support dynamic edits of materials, lights and cameras.
| Warning |
|---|
Progressive Refinement produces images containing more noise / fireflies, it should not be used for final renderings. Make sure to deactivate progressive refinement when rendering final frames. |
| Warning |
|---|
When using Progressive Refinement, the Filter Type and Filter Width attributes (specified in the Quality group of rendering attributes) are ignored. A Box filter with a width of 1 is used instead. Because of this, your image rendered with this option may differ slightly from your final render using Maya Batch. |
...