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As the title says, I have a sun as an object (4 I think) and I basically want to fade a white sprite in as you look closer to the sun, But I also need to figure out how to prevent it through other onjects like buildings...

Tom

You're asking how to determine if an object is occluded. Here's a simple method:

(1) Take the sun's screen x and y
(2) Use 'pick object' with those coordinates
(3) Check if the object is the sun (or sky box, or whatever you're using to display your sun).
(4) If it is, proceed to step 6
(5) It's not: hide your "flare" object; do not proceed with the following steps.
(6) Show your "flare" object.
(7) Apply your fade operation.

I can't tell what you're looking for (in terms of "fade") here, exactly. It's hard to tell without context. Are you trying to do lens flare?

Cheers,
Aaron

EDIT: PS: I make no claims of efficiency for my method, btw. There are things you can do, like only checking every 'x' frames. Checking if the object is even in view before doing any of these operations. etc.

Well I kind of have the lens flares working, I just want to make a blinding effect when you look closer to the sun..so as the sun gets closer to the center of the screen, start to fade in the white sprite until it's dead in the center and almost fully faded in

You can do a simple distance check:

I didn't test the code, but it should work