[Seeadler]

Originally Posted by sober

I can get rid of the banding completely by deleting the gradiant but it deletes the sun as well .

based on the posted shader function above, set the interpolate value in the lerp() function to a constant value. That ought to repeal the individual gradients but does not affect the pixel color for the sun.

change from:

 // 1. base gradient, from top to bottom    
 float heightRatio = pow(In.eyeDir.w / 992.0, g_skyBottomColor.w);    
 color = lerp(g_skyBottomColor.rgb, g_skyTopColor.rgb, heightRatio);

to:

// 1. base gradient, from top to bottom    
// float heightRatio = pow(In.eyeDir.w / 992.0, g_skyBottomColor.w);    
color = lerp(g_skyBottomColor.rgb, g_skyTopColor.rgb, 1 /*heightRatio*/);

I can not say if it work and/or how it will look in the game, I have SH5 not installed on my PC.