add text to a Texture2D while game is running

Questions & Answers
1

My game has a feature where it takes a screenshot (Texture2D) and posts it to social media platforms - all pretty standard. I’d like to add some text to the screenshot (score etc) but I’m stuck. Any tips?
Thanks

3

I ended up doing it with a RenderTexture. Here were the steps I took.

  1. Duplicate the main game camera, call it “ScreenshotCam” and set it to a lower depth (not sure if that was required)
  2. Make a new render texture in the project panel and set it to a decent size
  3. Make the render texture the “target Texture” of the ScreenshotCam
  4. Add some UI text for score and a UI image for the game logo. Put these both on a layer that is only rendered by the ScreenshotCam (ie uncheck the layer in the culling mask dropdown of the main camera)
  5. output the current score to the UI text box as the game is being player
  6. Make the render texture created in step 2 active while taking the screenshot.

Here is the capture function I’m using.

function CaptureScreen() {
	yield  WaitForEndOfFrame();
	var currentRT = RenderTexture.active;
	RenderTexture.active = scoreRenderTexture;
	var tex = new Texture2D(screenshotScoreCamera.pixelWidth, screenshotScoreCamera.pixelHeight, TextureFormat.RGB24, false);
	// Read screen contents into the texture
	tex.ReadPixels(screenshotScoreCamera.pixelRect, 0, 0);
	tex.Apply();
	
	RenderTexture.active = currentRT;
return tex;
}

Hope others find this useful.

2

This should help you, but in general looking into the Texture2D documentation gives you an idea of how to modify a texture (by GetPixels, SetPixels and Apply):

Adding Text-To-Texture at Runtime in Unity3D Without Using Render Texture