Just a note, seems like this might be broken in Defold 1.6.4 - Console comes up with hundreds of ‘tex1 cannot be empty’ for each of the game objects. Setting it to anything that exists (builtin/particle blob) does seem to work though, not sure of the side effects of doing so.
Maybe similar to the issue in Illumination — Ready-to-use forward shading lighting for 3D games - #27 by astrochili
Definitely a great example and many thanks for sharing!