Camera clearFlags/cullingMask bug on Mac

Unity Engine
1

In order to pause the camera rendering, I am setting the “clearFlags” to “CameraClearFlags.Nothing” and the “cullingMask” to 0. On Windows, this works exactly as expected. On Mac, however, the image flickers very noticeably.

I have a very small test project attached, where a cube continuously moves back and forth. You can click the left mouse button to toggle the two camera settings back and forth. If you’re on Windows, it will pause the rendering as expected. On Mac (standalone or web, but not in the editor) the cube will noticeably jitter.

There’s a web demo here:
http://codecommode.com/unity/CameraTest.html

Does anyone have a guess as to what might be happening, or how I might be able to work around it? I am using this code to freeze the image on screen and then apply some effects using a full-screen shader.

1890658–121668–CameraTest.zip (244 KB)

2

That seems like undefined behavior to me, rather than a bug. You’re telling the camera not to clear, and then not defining what it’s actually supposed to draw. So what happens would vary depending on platform, drivers, etc. A defined way to freeze the image would be to use rendertextures along with Camera.Render, since that way you’re explicitly telling the camera what to draw.

–Eric

3

Thanks for the clarification. Could you give me some guidance on how to go about this with RenderTextures?

4

Render the scene to a texture, which you can put on a screen-size quad. (Which is then rendered by another camera.)

–Eric