Script rendering Mesh to Image with transparent background

Question

Hi,

I have a dynamically generated but static (after generation) mesh. The mesh has a material with an unlit shader using the alpha channel. Is it possible to render this mesh to an image with transparent background? The process should happen offscreen.

Answer 1

I found the answer:

Here:

https://docs.unity3d.com/Manual/class-RenderTexture.html https://answers.unity.com/questions/22954/how-to-save-a-picture-take-screenshot-from-a-camer.html

Create a render texture
Attach render texture to a camera, which should only capture the object / mesh
Set Camera to only render a specific layer
On capture (eg k press) move camera infront of specific game object and move game object to cameras specific render layer.
Capture image given code below / answer links.

(If unsused) dispose of Destroy(screenShot )

  private void Start()
     {
         captureCamera.enabled = false;
     }
 
     void LateUpdate()
     {
         capture |= Input.GetKeyDown("k");
         if (capture)
         {
             captureCamera.Render();
             RenderTexture.active = captureCamera.targetTexture;
             Texture2D screenShot = new Texture2D(screenShotWidth, screenShotHeight, TextureFormat.RGBA32, false);
             screenShot.ReadPixels(new Rect(0, 0, screenShotWidth, screenShotHeight), 0, 0);
             RenderTexture.active = null;
             screenShot.Apply();
             byte[] bytes = screenShot.EncodeToPNG();
             System.IO.File.WriteAllBytes(ScreenShotName(screenShotWidth, screenShotHeight), bytes);
             Debug.Log(string.Format(ScreenShotName(screenShotWidth, screenShotHeight)));
             capture = false;
         }
             
     }

Script rendering Mesh to Image with transparent background

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