The information in this article applies to:
When I attempt to start a Ray Trace rendering or when a few Ray Trace passes have already completed, I receive the following message:
"Unable to Perform Photon Mapping."
What is causing this to occur?
Photon Mapping is an Advanced Ray Trace setting that accurately calculates bounced lighting in a scene. If Photon Mapping is turned on, it may be unable to be performed due to one or more of the following reasons:
A large terrain perimeter that contains a varying amount of elevation data will prevent Photon Mapping from being utilized in many cases. Lessen the length and width of the terrain perimeter, rebuild the terrain by navigating to Terrain> Build Terrain , and attempt to start a Ray Trace once again.
A rogue object may also cause this error to occur. If creating a Perspective Full Overview causes your structure to appear small on screen, or the view generated appears to be blank, there is a likely chance that a rogue, stray object is present in the plan. To resolve this issue, please see the Troubleshooting Small or Blank Camera Overviews article located in the Related Articles section below. Once the rogue object is gone, start a Ray Trace rendering.
If you're unable to resolve this error, please use the Backup Entire Plan tool to create a backup of the .plan file and all the associated files. More information on creating a complete backup of your file and all of its contents can be found by accessing the Knowledge Base Article 00987 - Using the Backup Entire Plan Tool.
After a complete backup of the plan is created, please send this to the Technical Support Department using the Online Support Center. More information on the Online Support Center can be found by accessing the Knowledge Base Article 00717 - Using the Online Support Center.