How Can I Get Pixels From Unreadable Textures? (Unity)
- I want to get pixels from a Texture
- I do not want to set the texture as “readable”
In order to use Texture2D.GetPixels you need to select “Read/Write Enabled” on Texture Import Settings to enable access to the texture data from scripts. Sometimes you need to get pixels from a texture without having to set the texture as readable, similar to how the Unity Editor does it to get preview images from Textures.
// Create a temporary RenderTexture of the same size as the texture RenderTexture tmp = RenderTexture.GetTemporary( texture.width, texture.height, 0, RenderTextureFormat.Default, RenderTextureReadWrite.Linear); // Blit the pixels on texture to the RenderTexture Graphics.Blit(texture, tmp);
// Backup the currently set RenderTexture RenderTexture previous = RenderTexture.active;
// Set the current RenderTexture to the temporary one we created RenderTexture.active = tmp;
// Create a new readable Texture2D to copy the pixels to it Texture2D myTexture2D = new Texture2D(texture.width, texture.height);
// Copy the pixels from the RenderTexture to the new Texture myTexture2D.ReadPixels(new Rect(0, 0, tmp.width, tmp.height), 0, 0); myTexture2D.Apply();
// Reset the active RenderTexture RenderTexture.active = previous;
// Release the temporary RenderTexture RenderTexture.ReleaseTemporary(tmp);
// "myTexture2D" now has the same pixels from "texture" and it's readable.