Cocos2D/OpenGL using Blend Function to make background appear

[WhiteWidget]

Hi,

I've been looking all over for the answer to this. How do I achieve this using BlendFunc in cocos2d/opengl?

I have an image that spans the whole screen, let's say the image is a grid. I don't want the whole grid to be visible at all times. The visible parts should only be the parts of the grid where there are other glowing objects on top of it.

If you look at InfinityField, it's similar to what it did. All the objects on screen had a glow to them, and they illuminated some shapes below them.

Thanks...

[WhiteWidget]

Nvm guys I was finally able to figure it out at last I don't know if I can just delete this thread or a mod could close it for me... thanks!