This is my second post here regarding the custom shaders in Corona.
I played a bit with different shaders from Shadertoy and mixed several of them to create a portal effect, although it's not fully complete.
Here is the link for the Corona Shader Playground: https://goo.gl/Uxn7VQ
Basically, what I want to achieve here is to make the black rotating part white instead. I tried playing with the code but couldn't do it.
If anyone has any knowledge on how to achieve this I'd be really grateful.
Thank you all and have a nice day!