Changes

* [[http://www.turbosquid.com/ TurboSquid]] 3D modelling community* [[https://sketchfab.com/ Sketchfab]] 3D modelling community* [[https://www.blender.org/ Blender]], a free and open source 3D modelling program* [[http://opengameart.org/art-search-advanced?keys=&field_art_type_tid%5B%5D=10 OpenGameArt]] has a trove of mixed-quality 3D models free for use.* [[https://nasa3d.arc.nasa.govmodels/ NASA's 3D Resources]] gallery has a number of public domain, space-themed 3D models. The files are in a few different formats, including .FBX, .3DS, .OBJ, and the less familiar .STL (stereolithography), but converters are easily found across the web.

* [[http://wiki.polycount.com/wiki/Normal_Map_Technical_Details Normal Map Technical Details]] at the Polycount Wiki* [[https://www.reddit.com/r/learnVRdev/comments/4of3kj/texture_maps_explained_an_introduction_to_pbr/ Texture Maps Explained: Physically-Based Rendering Workflow]]