How to copy a cubemap into a cubemapArray-Asset (DirectX11) with Graphics.CopyTexture

Hey,

Firstly you haven't specified a platform, so I would run SystemInfo.supportsCubemapArrayTextures to be sure they're available: https://docs.unity3d.com/ScriptReference/SystemInfo-supportsCubemapArrayTextures.html

Have you populated your cubemap array with placeholder cubemap faces?

What texture format are you using for the textures inside your cubemap? (TextureFormat.ARGB32, RenderTextureFormat.ARGB32 etc..)?

Are you using https://docs.unity3d.com/ScriptReference/Texture2D-mipmapCount.html to calculate the mip map level for your textures?

I hope this helps.

Andy

Hi Andy,

thanks for your answer. My platform is Windows 7 on DirectX11, I have run SystemInfo.supportsCubemapArrayTextures and yes, the system supports CubeArraytextures.

I use for the test TextureFormat.RGBAHalf, but I would like to use TextureFormat.BC6H in the end, because the prerendered cubemaps (created with Vray in 3DStudioMax) are .hdr-textures. The layout is 6 faces side by side.

I have not used Texture2D-mipmapCount yet, since I am very close to my cubemap and should only see the first mipmaplevel.

I have used Graphics.CopyTexture( loadedTexture, b, 0, textureArray, b, 0);

I could post the complete code if necessary.

Could you give me a feedback?

Thanks Robert

P.S.: So here is an extract of the code:

 path = "Assets/Resources/ReflectionMaps/";
 loadedTexture = AssetDatabase.LoadAssetAtPath( path + "reflectionMap.asset", typeof(Cubemap) );
 dim = 256;
 textureArray = CubemapArray(dim, 1, TextureFormat.RGBAHalf, true, true);
 Graphics.CopyTexture( loadedTexture, b, 0, texArray, b, 0);
 texArray.Apply( false, false );
 AssetDatabase.CreateAsset(texArray, "Assets/Resources/reflectionMaps/reflectionMapsArray.asset");
 AssetDatabase.SaveAssets();

Hmm, no answer yet. I have managed to create cube Arrays per Script, and it works fine with get/setPixels, but not with Graphics.CopyTexture. The latter works in the viewport, but not when I try to save the array as asset, it will remain black. Any idea why? I need to use Graphics.CopyTexture because I would like to use BC6H-format.

Here is a sample of the code:

 cubeArray = CubemapArray(dim, hdrTexturesNames.Count, textureFormat, true, true); //mipmap bool, linear bool
 AssetDatabase.CreateAsset(cubeArray, "Assets/Resources/reflectionMaps/" + "reflectionMapsArray.asset");
 
 for (var a = 0; a < hdrTexturesNames.Count; a++)
 {
     cubeMapAsset = AssetDatabase.LoadAssetAtPath( path + hdrTexturesNames[a] + ".hdr", Cubemap ) as Cubemap;
     miplevels = cubeMapAsset.mipmapCount;
     for (var f = 0; f < 6; f ++)
     {
         for (var b = 0; b < (miplevels - 2); b++) //the last two levels don't work because the minimum pixel dim is 4 for BC6H
         {
             texWidth = dim / Mathf.Pow(2,b);

             Graphics.CopyTexture(cubeMapAsset, f, b, 0, 0, texWidth, texWidth, cubeArray, (f + 6 * a), b, 0, 0);
         }
     }
 }
 
 AssetDatabase.SaveAssets();