Fix for Blender 2.81 API

[nrgsille76]

added texture paint slots for images
fixed materials (ambient to line color, reflection to metallic, alpha to diffuse alpha)
material index taken from polygons
fixed matrix multiplication
added view layer for selected objects

[raandoom]

Thanks, need to check it with Trackmania. Because Trackmania dont need materials or textures :) But if this request doesnt break export, why not - i can accept it. But need to check export before.

[nrgsille76]

It works for the 3ds importer of the light visualisation software MA3D. It was especially nessecary to export the object node tree, thats why the default 3ds exporter does not work. Your script has helped me a lot, so I wanted to say thanks by contributing some help to port it to blender 2.80^^

[VTXSRB]

merge??

[raandoom]

merge??

Are you using it for MA3D? Do you need it for 2.8 branch or for latest blender releases too?

[nrgsille76]

merge??

Are you using it for MA3D? Do you need it for 2.8 branch or for latest blender releases too?

You do not need to merge it, I already improved the original blender script to work with blender 3 and 4
It is available here: io_scene_3ds