runtime normal map created.

Hey Guys~
I wanna create runtime normal map texture.
But I couldn't set normal map option on created texture2d.
anyonw knows about this?

 

The generation of normal maps is a function of the Texture importer and is not available at run-time.
You have to calculate is yourself or use some kind of script or Substance material.
There is a cheep asset at the asset-store that does this kind on run time too. (Not tested)
http://forum.unity3d.com/threads/normal-map-maker.254310/#post-1797451

This might be interesting too:
http://forum.unity3d.com/threads/normal-map-from-height-map-on-runtime.259273/

 

There is no switch when scripting like when in Editor mode. You need to do the process manually.

You convert the texture's red and blue colour channel values to the green and the alpha channel value to the red. See the code we use (edited to be more generic) below.

Code (CSharp):

1. // Process normal map
2. Texture2D normalTexture = new Texture2D(512, 512, TextureFormat.RGBA32, true);
3. normalTexture.filterMode = FilterMode.Trilinear;
4. normalTexture.wrapMode = TextureWrapMode.Clamp;
5. Color[] pixels = yourTexture.GetPixels(0, 0, width, height);
6. float r, g, b, a;
7. for (int i = pixels.Length - 1; i >= 0; i--) {
8.     Color c = pixels[i];
9.     r = g = b = c.g;
10.     a = c.r;
11.     pixels[i] = new Color(r, g, b, a);
12. }
13. normalTexture.SetPixels(pixels);
14. normalTexture.name = "a normal map";
15. normalTexture.Apply(true);

 

And that one needs customized shaders when using runtime created normal maps, see the shader fix here:
http://forum.unity3d.com/threads/cr...aps-using-rendertotexture.135841/#post-924587