shaders are applied to an object to improve his rendering effect.
For example shaders are used to fix flashing tarmac.

nkasphalt and tangent are the shaders usually used.
nkasphalt is nice, but also tough on fps. tangent is easier on performance.

As a basic rule:
give all flat objects nkasphalt shader. So asphalt, grass, sand, kerbs
give all vertical objects tangent shader. So walls, some small objects around the track.

no shader on trees and big objects like boxes.



To apply a shader select an object and select the correct shader from the combo box

If you want to use the Tangent shader you always have to specify even the related bump texture.
You can do that clicking on vars 2, as showed below.




If you will not specify the bump texture, you will get the following problem. In this case nKengine will get the default bump mapping.