A while ago I looked into it, it seems most techniques for fur shading use transparant shells around the object with the fur texture, but it results in kind of blurry fur. There might be better ways, I'd say try searching on google
Yeah Render Monkey has one in it but its not so good, unless there has been an update and they have a better one than what I last saw. Best place to go is to ATI's developer page: http://www.ati.com/developer/index.html. The Tomohide Dynamic Fur Demo is the best I've seen, very cool demo: http://www.ati.com/developer/indexsc.html. I think it has all the source included in the demo too.
TobascoSpam wrote:The Tomohide Dynamic Fur Demo is the best I've seen, very cool demo: http://www.ati.com/developer/indexsc.html. I think it has all the source included in the demo too.
Anyone care to detail a little mor what a fur shader is?
I might be interested in funding development of an ogre one, hint hint
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Ya, but IMHO that's the sort of fur that can cover a donut and be used in a tech demo, but not in realtime. That's why we haven't seen it being used in a game.
I don't doubt that Lionhead used the fin approach to fur, where fins are placed all over the body.
Here's a new fur shader posted April 1st, but no source code or demo yet. It's a variation of the parallax map fragment shader.
Falagard wrote:Ya, but IMHO that's the sort of fur that can cover a donut and be used in a tech demo, but not in realtime. That's why we haven't seen it being used in a game.
I have actually implemented fur in my code using the shells technique. But it was brute force (non shader) so whilst the effect was pretty decent, it hammered the fill rate. And yeah, I guess this technique would suffer when used with more complex model and simulation.
I don't doubt that Lionhead used the fin approach to fur, where fins are placed all over the body.
Is this the same technique as what is usually done with grass? I.e loads of quads on an object with semi-transparent textures?
The fin approach doesn't sound that bad. Its typical cheating with graphical techniques used in computer games (IE, let the artist do the work, not the GPU You could even have the fins affected by wind with a simple vertex shader, a bit like the Grass demo.
Well if you lower the number of layers (i guess fins?) depending on distance and maybe even switched to a texture at some distance I think it could be managed. I mean you wouldn't want to cover everything in sight with it. Lionhead for example is only covering thier creatures with it. Most movies that are CG use this technique for grass as well (from what i know just from extra features on DVDs ). I'm not sure that it would be wise to use it for grass though in a game, I suppose that so long as there aren't a whole lot of polys with it on screen at any one time it would be fine and if you reduced detail in the distance again. I do know that in the featured projects Antilia appears to use this: http://www.antilia-game.com/index.php?page=media. I was also wondering has anyone thought about using this technique of fins on trees for all the leaves?
I found another Fur demo with code that I forgot about on NeHe: http://nehe.gamedev.net/data/downloads/ ... p?letter=F. It's at the bottom of the page. It runs faster than the Tomohide fur demo, probably because it does not simulate physics acting on the fur. Anyway just some more example code for ya all.
). I'm not sure that it would be wise to use it for grass though in a game, I suppose that so long as there aren't a whole lot of polys with it on screen at any one time it would be fine and if you reduced detail in the distance again. I do know that in the featured projects Antilia appears to use this: http://www.antilia-game.com/index.php?page=media. I was also wondering has anyone thought about using this technique of fins on trees for all the leaves?