post process underwater effect

hmmm, can anyone point me in the right direction....heres an image of what i mean:



i want anything behind/under the water to have a post-processing sine-wave kinda thing happening. pretty much where the yellow square is where i mean.

thanks for any help.

Well, that's not really the best way to do it. Here's some steps that should be beter:

1. Render everything beneath the water normally (no distortions, no transparent-blue, just as if there was no water) from the perspective of the camera.
2. Copy the screen (which is right now just what is beneath the water) to a texture
3. Render the water with the above texture as its texture.
4. Apply a pixel shader that:
A. Calculates which point on the texture it should be based on the normal of the water at that point and the vector from the camera to the water. Then use the point on that texture as it's texture.
B. Adds some blue, or whatever other color

4A is the only really tough part. The normals for the water could be calculated from sines or similiar (though not very realistic, sines are better than nothing!). I'd be willing to bet that there's a gamasutra article about this if you search. :)

i kinda get what your saying
thanks man