terrain - runtime created texture with mipmapping cause gray render errors

Hi

I'm creating a texture during runtime with mipmapping which is applied to terrain. In far distance it gives a weird grayish drawing error. Triangles here and there flickering at times.
Works fine if mipmapping is disabled.
Works fine if saving the texture to disk and reloading it using WWW.

Any ideas how fix it properly?

I'm using the latest Unity version.

Basic code that cause the error.

Code (csharp):

1. Texture2D splat_texture = new Texture2D(512, 512, TextureFormat.RGB24, true); // mipmap set to true cause gray flicker render error in distance
2.  
3. // ... setpixels here
4.  
5. SplatPrototype splat_prot = new SplatPrototype();
6. splat_prot.tileOffset = new Vector2(0, 0);
7. splat_prot.tileSize = new Vector2(256, 256);
8. splat_prot.texture = splat_texture;
9. // splat_prot.texture = Instantiate(splat_texture) as Texture2D; // same error
10.  
11. // ... update splatprototypes on terrain

 

bump