Subscribe to download
Transparent Masking Void Map

This is a map that helps create transparent renders by making every model entirely white with a black background to create an alpha mask.
See the above video for a quick tutorial on using this map with the Alpha Mask Paint.NET plugin[forums.getpaint.net] to create a transparent render.
You must disable bloom on your scene's camera and disable any post-processing such as motion blur, depth-of-field, and anti-aliasing in order to export a clean image.
Sadly, particles are not supported.
If you go into game mode, you can walk forward to disable the white overlay. Doing so will turn this map into a giant black void, and you can re-enable the white by walking backwards in game mode.
Feel free to credit me, but do not use outside of the context of the Steam Workshop and the Steam Subscriber Agreement. No further restrictions apply.

Includes:
transparent_masking_void.bsp