KE Attribute in MTL Files

Question

I have a .mtl file next to my .obj file which specifies the materials for the object. Im trying to create a parser but dont know what the "Ke" attribute means. e.g:

Ka 0.78 0.78 0.78 
Kd 0.78 0.78 0.78
Ks 0 0 0
Ke 17 12 4 # What does this line mean?

Thanks :)

Answer 1

Ke stands for emissive coeficient. It goes together with ambient, diffuse and specular and represents the amount of light emitted by the material. If you also have a defined emission color the material will irradiate light.