WARNING: Couldn't find image for shader textures/atcs/skybox_s

[illwieckz]

This material is defined in scripts/atcs.shader:

textures/atcs/skybox_s
{
	qer_editorimage textures/atcs/mars
	surfaceparm noimpact
	surfaceparm nolightmap
	surfaceparm sky
	q3map_lightimage textures/atcs/skylight
//	q3map_sun 0.95 0.95 1.0 150 120 25		//lilacisles
//	q3map_sun 1.00 1.00 0.965 75 90 30		//siege
//	q3map_sun 1.00 0.90 0.80 110 180 35		//orangecream
//	q3map_sun 1.00 0.80 0.70 100 0 20		//cottoncandy
//	q3map_sun 0.934 0.835 1.00 75 230 35	//desertsky
//	q3map_sun 1.00 1.00 1.00 50 90 90		//comablack
//	q3map_sun 4 3 3 150 135 50				//mars
//	q3map_sun 1.00 0.949 0.977 100 200 45	//desert
	q3map_sun 1.00 0.949 0.977 150 135 45
	q3map_skylight 250 3
	q3map_globaltexture
	skyparms env/atcs/mars - -
}

The light image is missing. It looks like it was missing in Tremulous to begin with.

Bringing it (if we find it) may break lighting of maps making use of it since such maps relied on the image being missing to achieve the expected light color.

So we may just remove or comment out this line to silent the warning and make sure the image isn't used if one day it surfaces:

	q3map_lightimage textures/atcs/skylight