Hi there,
thanks for your replies. Unfortunately I was very busy the last weeks.
I'll try to describe my problem a little bit more precisely.

I importet ad .3ds Model into the MED. There were no diffuse,ambient or emissive colors (all set to 0,0,0). Just specular colors (125,125,125). When I do the engiene preview the model appears like I expect it to and like it does in 3DSmax.

When I create a new project in WED and insert just the model it looks exactly like in the engine preview of MED. - like I expect it to. (the background is blue) I don't set any ambient or sun light nor do I have any light source in my world.

Now I add an empty script. When I compile and run the project the screen is black. This doesn't change when I add ambient or sun light in the Map properties. Even if I add a light object this doesn't change.
The screen is black because there are no blocks or anything that reflect the ligth. But my model should do this.

As soon as I remove the script the background is blue again and the model has the right colors.

Are there any default settings for lights and the refelction of lights that a model does, that are overridden as soon as I attach a script to the project?

Or are there any settings I do have to change for my importetd model entity?

Thanks in advance