OBJExporter: Convert Linear vertex colors to sRGB

[gkjohnson]

Related issue: #23283

Description

Convert colors to sRGB before OBJ Export. It looks like OBJExporter was only including colors for points instead of triangles.

https://raw.githack.com/gkjohnson/three.js/obj-export-color/examples/misc_exporter_obj.html

Note that because colors are converted now it's possible that the final color value is formed from a long decimal value:

v 0 0 0 0.7353606352856507 0 0
v 100 0 0 0.7353606352856507 0 0
v 100 100 0 0 0.7353606352856507 0
v 0 100 0 0 0.7353606352856507 0

Is there a quick way to truncate that to 4 or 5 decimal places? I only know of parseFloat( color.r.toFixed( 4 ) ) which works but seems a bit roundabout. Or do we need to do that? It looks like the positions are not truncated in any way.

[mrdoob]

Is there a quick way to truncate that to 4 or 5 decimal places? I only know of parseFloat( color.r.toFixed( 4 ) ) which works but seems a bit roundabout. Or do we need to do that?

I don't think we need to truncate them no...

[mrdoob]

Thanks!