The main goal is to create a depth pass that store the opaque bucket depth information into the depth texture which then can be used by the fragment shader or the vertex shader of the "main pass" to achieve something that you can't do by using only one pass. In our case, it's soft intersection, which takes the current depth information of the target object and compare to the depth info of the texture and change the alpha based on the difference.
Another thing, we calculate the depth value by using the z value of the view position and divide it by the distance of the far clip plane. And I did it in the vertex shader and let it being interpolated instead of doing it for each pixel in fragment shader to save some performance, seems to be working so I'm keeping that.
The code took me 2-3 hours to write, and another 3 hours to debug. It's really frustrating to find out nothing works when you first build and run your code. And even more frustrating when you spent 1 hour tracking down one of the problem only to find out there is a typo in the freaking config file that you wrote.
But this was the first time that I appreciated PIX, it did make my life much easier. Debugging in PIX is truly a much faster way to find out your fix works, and it's very satisfying to see your program moving forward bit by bit by sequentially tracking down all those bugs.
Anyway, it's glad to see things working.
Here is the screenshot:
The Actual depth buffer:
Graphics10
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