/// <summary>
/// Computes and stores a texture map for the current submesh.
/// </summary>
private void ComputeAndStoreTextureMap()
{
// Check if the asset has already been processed.
string assetName = textureMapAssetPrefix + GeneralToolkit.ToString(_submeshIndex);
string bundledAssetName = dataHandler.GetBundledAssetName(this, assetName);
string textureMapRelativePath = Path.Combine(GeneralToolkit.tempDirectoryRelativePath, bundledAssetName + ".asset");
if (dataHandler.IsAssetAlreadyProcessed(textureMapRelativePath))
{
return;
}
// Render to the preview camera a first time to initialize all buffers correctly.
_previewCameraModel.pixelResolution = _textureMapResolution;
_previewCameraManager.UpdateCameraModel(_previewCameraModel, true);
_previewCameraManager.RenderPreviewToTarget(ref _previewCameraManager.targetTexture, false);
// Render the mesh to the preview camera's target texture.
Camera.onPreCull += DrawSubmeshAsTextureMapWithCamera;
_previewCameraManager.RenderPreviewToTarget(ref _previewCameraManager.targetTexture, false);
Camera.onPreCull -= DrawSubmeshAsTextureMapWithCamera;
// Normalize the RGB channels by the alpha channel.
RenderTexture tempTex = new RenderTexture(1, 1, 0);
GeneralToolkit.CreateRenderTexture(ref tempTex, _textureMapResolution, 0, RenderTextureFormat.ARGB32, false, FilterMode.Point, TextureWrapMode.Clamp);
Graphics.Blit(_previewCameraManager.targetTexture, tempTex, _normalizeByAlphaMat);
// Apply a morphological dilation to better handle seams in the texture map..
GeneralToolkit.RenderTextureApplyMorphologicalDilation(ref tempTex, _textureMapResolution.x / 200, ImageProcessingKernelType.Box, false);
// Copy the render texture to an output texture.
Texture2D outTex = new Texture2D(1, 1);
GeneralToolkit.CreateTexture2D(ref outTex, _textureMapResolution, TextureFormat.RGB24, false, FilterMode.Bilinear, TextureWrapMode.Clamp, true);
GeneralToolkit.CopyRenderTextureToTexture2D(tempTex, ref outTex);
outTex.filterMode = FilterMode.Bilinear;
outTex.anisoLevel = 3;
// Destroy created objects.
DestroyImmediate(tempTex);
// Save a copy as a png file for visualization.
string copyName = DataHandler.GetBundledAssetPrefixFromType(this.GetType()) + assetName + ".png";
GeneralToolkit.SaveTexture2DToPNG(outTex, Path.Combine(GeneralToolkit.tempDirectoryAbsolutePath, copyName));
// Create an asset from the created texture map.
AssetDatabase.CreateAsset(outTex, textureMapRelativePath);
AssetDatabase.Refresh();
// Set the created texture in the final array.
Texture2D texAsset = AssetDatabase.LoadAssetAtPath <Texture2D>(textureMapRelativePath);
textureMaps[_submeshIndex] = (Texture2D)Instantiate(texAsset);
}