GPU in blender
From LuxRender Wiki
Summary of what you have exactly to set to use LuxRender, in GPU mode, in Blender.
This instructions are helpful also for non-GPU users, just disable option to use GPUs and you are free to choose any Render Mode not just SLG Path OpenCL.
Using OpenCL GPU rendering from Blender.
Start by installing LuxRender in Blender (in blender enable LuxBlend plugin, after unpacking the files as described elsewhere e.g. LuxBlend_2.5_installation_instructions).
In Blender, on top change mode/renderer to LuxRender (if option is not there, then you didn't enabled the plugin).
Go to Renderer button.
- Set Export Type to External and Render using to LuxConsole (or you could prefer other options there too).
- Set Rendering Mode to SLG Path OpenCL.
- Enable Use GPUs.
Updates speed (blank/black screen?)
Screen of renderer might stay blank (checker) or black for some time. This is due to:
- LuxRender is rendering continuously forever (with no end condition)
- go to Render button and set Halt SPP to e.g. 500 (100-5000 make sense, it's number of samples per pixel) or other halt conditions.
- LuxRender is updating image slowly (e.g. in Blender)
- Go to Camera button, LuxRender film - options like update interval (lower them for faster updates at cost of overall throughput in some cases)
- This needs to be applied to all/active cameras
- If you use LuxGUI then in it's window you can change the update time (e.g. from default 10 seconds). Each time this window re-opens it resets/takes the settings from Blender camera settings.