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Unreal: Opacity influenced by object intersections (Bioshock waterfall example)
This one is for the Unreal guys. Does anyone know what shader setup was used in this Bioshock video where the Big Daddy steps into the sheet of falling water? The water itself just looks like a plane with its opacity influenced and masked out based on where the Big Daddy collides with it. It's something I've been… -
Re: Unreal: Opacity influenced by object intersections (Bioshock waterfall example)
Thanks a bunch for all the replies. The doc ColinR posted explains it, but the custom nature of the effect and time constraints means we probably won't get it in. Too bad, but getting to peek behind the curtain and see how they achieved it is cool. -
Re: Unreal: Opacity influenced by object intersections (Bioshock waterfall example)
I believe there's a PDF out there where two of their tech artists have described how they dealt with a lot of the water issues they were having during development and their workarounds. -
Re: Unreal: Opacity influenced by object intersections (Bioshock waterfall example)
ah my bad, i would have to say that may be chalked up to some of the custom programming that went into their water system. I think they claimed that had 1 artist and 1 programmer working solely on water systems for a year. -
Re: Unreal: Opacity influenced by object intersections (Bioshock waterfall example)
http://www.2kboston.com/powerpoint/The-Art-and-Technology-Behind-Bioshocks-Special-Effects.zip It's all there, and a good few pages on interactive waterfalls. Hopefully it helps you nick! in some way. Remember you posting up your showreel a good while back as well, was great stuff. :) -
Re: Unreal: Opacity influenced by object intersections (Bioshock waterfall example)
They have a pretty custom build of UE3 at this point. Nonetheless, there is some bad flickering if you really watch. Looks to be all smoke and mirrors / or a really cool water tech implementation. Or maybe a custom particle effect w/ collision on, duped a few times? Looks pretty sick either way. Edit - Jordan beat me to it. -
Re: Unreal: Opacity influenced by object intersections (Bioshock waterfall example)
Thanks for the reply, but that's not the effect I was referring to. I'm familiar with handling smooth/soft transitions between intersecting translucent planes using the depthbiased node. If you watch the video, the effect I'm after is where he intersects the water plane and everything below the points where his geometry… -
Re: Unreal: Opacity influenced by object intersections (Bioshock waterfall example)
It's called depth biased alpha, there should be a node for it. Basically run your opacity maps/instructions through it's alpha input and give it a bias for how thick the intersection should be.
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