private Texture RenderCubemapToTexture(Cubemap cubemap, int faceSize, Color clearColor,
TextureFormat textureFormat, bool exportFaces, string assetPathPrefix, bool alphaIsTransparency)
{
CubeFaceData[] faces =
{
new CubeFaceData(CubemapFace.NegativeX, new Vector2(0, faceSize)),
new CubeFaceData(CubemapFace.PositiveX, new Vector2(faceSize * 2, faceSize)),
new CubeFaceData(CubemapFace.PositiveY, new Vector2(faceSize, faceSize * 2)),
new CubeFaceData(CubemapFace.NegativeY, new Vector2(faceSize, 0)),
new CubeFaceData(CubemapFace.PositiveZ, new Vector2(faceSize, faceSize)),
new CubeFaceData(CubemapFace.NegativeZ, new Vector2(faceSize * 3, faceSize))
};
RenderTexture oldRt = RenderTexture.active;
Texture2D faceTex = new Texture2D(faceSize, faceSize, TextureFormat.RGBA32, false);
RenderTexture faceRenderTex = new RenderTexture(faceSize, faceSize, 24, RenderTextureFormat.ARGB32, RenderTextureReadWrite.sRGB);
faceRenderTex.Create();
RenderTexture flatCubeTex = new RenderTexture(faceSize * 4, faceSize * 3, 24, RenderTextureFormat.ARGB32, RenderTextureReadWrite.sRGB);
flatCubeTex.Create();
Material flipMat = new Material(Shader.Find("Funly/Sky Studio/Utility/Flip Image"));
Material blitMat = new Material(Shader.Find("Unlit/Transparent"));
RenderTexture.active = flatCubeTex;
GL.PushMatrix();
GL.LoadPixelMatrix(0, flatCubeTex.width, flatCubeTex.height, 0);
GL.Clear(true, true, new Color(0.0f, 0.0f, 0.0f, 0.0f));
GL.PopMatrix();
RenderTexture.active = null;
for (int i = 0; i < faces.Length; i++)
{
CubeFaceData data = faces[i];
// Pull a face texture out of the cubemap.
Color[] pixels = cubemap.GetPixels(data.face);
faceTex.SetPixels(pixels);
faceTex.Apply();
// Flip the image.
RenderTexture.active = faceRenderTex;
GL.PushMatrix();
GL.LoadPixelMatrix(0, faceRenderTex.width, flatCubeTex.height, 0);
Graphics.Blit(faceTex, faceRenderTex, flipMat, 0);
GL.PopMatrix();
if (exportFaces)
{
string path = assetPathPrefix + data.face.ToString() + ".png";
SkyEditorUtility.WriteTextureToFile(faceRenderTex, path, textureFormat);
RenderTexture.active = null;
AssetDatabase.ImportAsset(path);
}
RenderTexture.active = null;
// Target our cubemap, and render the flipped face into it.
RenderTexture.active = flatCubeTex;
GL.PushMatrix();
GL.LoadPixelMatrix(0, flatCubeTex.width, flatCubeTex.height, 0);
Graphics.DrawTexture(new Rect(data.offset.x, data.offset.y, faceSize, faceSize), faceRenderTex, blitMat);
// Write the final texture on last face.
if (i == faces.Length - 1)
{
string path = assetPathPrefix + ".png";
Debug.Log("Exporting cubemap to compressed texture at path: " + path);
SkyEditorUtility.WriteTextureToFile(flatCubeTex, path, textureFormat);
RenderTexture.active = null;
AssetDatabase.ImportAsset(path, ImportAssetOptions.ForceUpdate);
// Adjust texture settings.
TextureImporter importer = TextureImporter.GetAtPath(path) as TextureImporter;
importer.textureShape = TextureImporterShape.TextureCube;
importer.alphaIsTransparency = alphaIsTransparency;
AssetDatabase.ImportAsset(path, ImportAssetOptions.ForceUpdate);
}
GL.PopMatrix();
RenderTexture.active = null;
}
RenderTexture.active = oldRt;
return(flatCubeTex);
}