How to write Alpha Value to RenderTexture ?

Unity Engine
1

Hi everyone:

I’m working on some effects using RenderTexture.
I use an ARGBHalf RenderTexture.
The R,G,B channels have been used to store some information, but that’s not enough.
I want to use the alpha channel to store some extra information.
However, the alpha channel in the RenderTexture seems always been filled with 1.0.
Please help me.
Thank you!

Chris.

2

I found the solution from the Manual: keepalpha