Use 2 cameras to make a watermark

In unity projects, we often encounter the ability to share pictures after a screenshot, in order to prevent the infringement of content and enhance the ability to spread, we need watermark function. In unity, this implementation:

1, need to have two orthogonal cameras

2, two cameras with different depth

3, depth smaller because the rendering time than large, so as the main map rendering

4, depth large rendering time in the above camera, it is responsible for the watermark (or word) rendering to the above camera output

5. Create a new rendertarget in unity and then drag the rendertarget into the target texture section of the two camera

So the figure rendered in the RenderTarget is the watermark we need.