Unity - Scripting API: RenderTexture.active
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Description
Currently active render texture.
All rendering goes into the active RenderTexture.
If the active RenderTexture is null everything is rendered in the main window.
Setting RenderTexture.active is the same as calling Graphics.SetRenderTarget. Typically you change or query the active render texture when implementing custom graphics effects; if all you need is to make a Camera render into a texture then use Camera.targetTexture instead.
When a RenderTexture becomes active its hardware rendering context is automatically created if it hasn't been created already.
Additional resources: Graphics.SetRenderTarget, GraphicsTexture.active.