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With 3Delight you have the option to choose between two rendering engines: Path Tracing and REYES. This is done though the simple Render Mode menu option in the Render Engine group of attributes of the Render Settings. Note that using REYES does not preclude from using ray tracing, which will still be used on top of REYES for any secondary rays.

Here is a brief discussion of the advantages and disadvantages of each options.

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titleNOTE

It is important to outline the fact that in 3Delight the very same RSL shading framework can be used for both Path Tracing and REYES. 

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As of version 7.0.13 of 3Delight for Maya (and 3Delight Studio Pro v.11), Path Tracing is the default rendering engine.

Info
titleNOTE

It is important to outline the fact that in 3Delight the very same RSL shading framework can be used for both Path Tracing and REYES. 

Path Tracing

Pros:

  • Efficient at rendering densely tessellated geometry and dense scenes (forests, crowds, etc).
  • Massive instancing allows for memory efficient rendering of trees/crowds and other redundant scene elements.
  • Shading is usually "sharper" because shading is performed at each sub-sample (and not per pixel as in REYES). Although it is possible to obtain similar result with REYES by increasing the Shading Rate, it is usually avoided as it affects performance. One example of this benefit is in higher quality Layers Outlining. 
  • Scales better than REYES with increased number of cores.
  • Supports Multi-Light output.
  • Supports geometrical camera projections.

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