Mapdev:lightemission

Light Emission Texture

Adds colour to a fragment (pixel). The colour added is the RGB colour of the emission texture, while the alpha of the emission texture determines the amount of the original colour that remains.

Can be used for accentuation. For example, metal spots in shadowed regions

Example

FIXME: needs image file	FIXME: needs image file
Without Light Emission Texture	With Light Emission Texture

Specification

mapinfo.lua

The relevant sections of the mapinfo.lua

local mapinfo = {
   ...
   resources = {
      ...
      lightEmissionTex = "light_emission.png",
      ...
   },
   ...
}

Image File

File Location	./maps/
File Format	PNG, TGA
Colour Depth	8bpp
Channels	RGBA
Resolution	Any, recommended powers of two, will be stretched over the terrain. Should be the same size as the Mapdev:specular image

FIXME: needs cleaning.

Modifies the fragment color as follows
 
fragmentColor.rgb = fragmentColor.rgb * (1 - lightEmissionTex.a) + lightEmissionTex.rgb