I have some strange effect in RTT mode. When I draw data with TransparentToAlpha material the background of RenderTexture (in case it's not transparent) gets the Alpha of drawed data. On the textures below you can see difference of render to FrameBuffer and render to RT before. The airplane has transparent pices (cube and background throw airplane) in case of RTT.
Normal render
Render to texture (transparent pices)
