Splitscreen to RenderTexture

I'm trying to set up a view where I have two cameras rendering to different parts of a RenderTexture. However, when I attach a RenderTexture to each camera, it seems that its Viewport Rect gets ignored.

Am I missing something? Is there any decent workaround for this?

Thanks!

 

This behavior is intended:

Either don't have the cameras render to a render texture but to the screen directly, or if you really need them to render to a texture first, you have to manually create the split screen. Have each of the cameras render to a texture with half the screen height, then use Graphics.DrawTexture() to draw those render textures onto a third one, at their respective positions. A good place to do this would be in a script that's attached to a camera that outputs the combined texture to the screen. Override OnRenderImage(), and blit the combined texture onto the "dest" render texture in that method.

 

I've just tried and viewport setting works with RenderTexture for me.
Can you try my attached example?

 

Well I'll be, looks like it does work. I could've sworn I've tried it before and failed - I guess the documentation needs some updating then.

 

Sorry to necro an old thread but since this is the top result on google for sending split screen to a render texture this info needs to be in it. This will not work if you have HDR checked on your cameras. High dynamic range and sending custom viewport rects to render textures do not work together for some reason. It took me hours of frustration before I finally realized that was why I couldn't get it to work like mholub's example.