Multicolor (by faces) model

[gilboonet]

Hello, i'm still working on improving my unflatten script, and the latest improvement I'm working on is a convenient way to specify separated spaces on a model. OBJ format can save a model with faces of different materials, so I adapt my Stl2Jscad nodejs script to obj. Here is an example using it :
https://github.com/gilboonet/auto_flattener/tree/master/testOBJ

To show the example into openjscad.org there's some work to do :

• copy the directory and open it,
• run node obj2jscad montage2 on the cli, that will create the file "modele_obj.jscad",
• open openjscad.org and drag "modele_obj.jscad" and "testOBJ.jscad"

You can then, easily modify the model colors (I do it with Wings 3D and what is important is not the colors but the materials), save the obj file, run obj2jscad on it again, and refresh jscad script.

I'm not certain that lots of people need multicolor models but I hope that that idea could be useful.

[gilboonet]

My code (obj2jscad) only reads a very simple OBJ file (only triangular without normals or textures) and take use of its facets materials groups. Materials are described into another file that I don't use but it could be done to read colors as materials simplest expression can be colors. True OBJ format is much more complex than that.

[z3dev]

@gilboonet Cool innovations!

Colors are becoming very important with the growing number of multiple head/filament printers. The slicing software requires different colors when deciding on the filament to use.

It would be nice to add the support for colors (materials?) into the OBJ import/export library. I'll chat with you later when revisiting the OBJ libraries.