Effect Shader Tutorial?

[Omny]

Are there any good tutorials out there for making effect shaders? I'm trying to create a mod that adds withdrawal symptoms to Cateye, and I want to cause the player's vision to get all red and desaturated.

 

Right now all I've got is a copied version of the Cateye effect shader with a different ID. Is there a way to preview effects so I know it looks right?

[aaronz12345]

For changing the screen color you use image space modifiers or ISFX's not the effect shader. I believe so anyway.If you want a base to work on look at the poison iSFX under image space modifiers.It previews in the render window.