LuxBlend tutorial:installing LuxBlend
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From LuxRender Wiki
LuxBlend is a script that runs within Blender. This tutorial shows all steps needed to make the script show in the Blender interface. After that, there are some instructions in case you want Blender to show up the LuxBlend window by default.
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download LuxBlend
If you haven't already done so, check the the download page for the link to the latest version of LuxBlend. Follow the link to that page and download the file. The file should be called something like LuxBlend_0.1.py.
The file you just downloaded is a Python script, which is the most common format for extensions to Blender. You could save it anywhere, open it in Blender's text editor window and run it by pressing alt-p, but there is a more elegant way to run it.
save the LuxBlend file in Blender's scripts folder
Whenever Blender starts, it checks a certain folder to see which Python scripts should be loaded. If we put the LuxBlend file in this folder, it will be recognised by Blender and show up in the export menu.
The exact location of the folder we are looking depends on your operating system. On Windows XP, it is most likely in Program Files\Blender Foundation\Blender\.blender\scripts, on Vista it may either be the same location as XP or otherwise C:\Users\[username]\AppData\Roaming\Blender Foundation\Blender\.blender\scripts. On Linux it should be /usr/lib/blender/scripts and on OS X /Applications/Blender/Blender.app/Contents/MacOS/.blender/scripts/. If for some reason the folder is not to be found, try using the search function for 3ds_export.py; this file should be located in the folder we're looking for.
Once you've found the right folder, move the LuxBlend file there and start Blender
run the exporter in Blender
If all went right, LuxBlend should show up in Blender's file menu under the Export section. Selecting it will turn one of Blender's windows into the LuxBlend panel.
The first time you run LuxRender, you may get a popup message asking to specify where to find the LuxRender program. After having located it once, the script should remember this information.
configure Blender's windows
For many operations, it is convenient to have the LuxBlend window and a 3d window side by side. By right-clicking on a window border, you can split an existing window into two. Change one of the windows back into a 3D view (using the window type button in the lower left corner) and drag the window border to give the windows the desired size.
In case you want to merge the windows into one again, right click on the border between the windows you want to merge and select "Join Areas".
save default settings
If you want to, you can save the current window configuration as Blender's default, so that the exporter panel will show automatically next time you start Blender. To do so, go to the File menu and select "Save Default Settings". Please make sure you only do this when the scene is still empty as any objects that are present at the time of saving defaults will appear any time you start Blender.