Creating a grass texture with GLSL
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Hi,
I'm working on a soccer project and I have to create a grass texture for the soccer field using openGL shading language (glsl). I've found so topics on the internet but nothing good for me.
I'm working on ogre3D.
Here is a screen shot of my program with a simple texture :
http://img10.imageshack.us/img10/5521/captureus.png
http://www.cg.tuwien.ac.at/research/publications/2007/Habel_2007_IAG/Habel_2007_IAG-Preprint.pdf
Here´s a paper explaining one of the most practical grass shaders i´ve seen. It is simple enough to implement and the results are very good.
Two drawbacks:
-Looks good at grazing angles, when seen from above, like in a soccer game, you can see the reticle structure.
-The paper does not include glsl code, you´ll have to figure it out yourself. Only formulas explained.
Here´s a paper explaining one of the most practical grass shaders i´ve seen. It is simple enough to implement and the results are very good.
Two drawbacks:
-Looks good at grazing angles, when seen from above, like in a soccer game, you can see the reticle structure.
-The paper does not include glsl code, you´ll have to figure it out yourself. Only formulas explained.
I just dropped in here because I'm doing a grass technique but using models and lodding levels. I was pretty keen on this until I realised what he was doing and the fact that getting your eye in the grass won't be possible because it's a planar effect, like a simple version of deep parallax occlusion.
But if you want to do this (I'm certainly going to try it) then there are both the shaders and his sample textures available. I've already downloaded them for later.
You can see a reference in his work to [Hab] (iirc) and if you look that up in the credits at the bottom, a URL is supplied to get to the goodies. Hell, it's even still live! :)
Hope that helps - enjoy it :)
But if you want to do this (I'm certainly going to try it) then there are both the shaders and his sample textures available. I've already downloaded them for later.
You can see a reference in his work to [Hab] (iirc) and if you look that up in the credits at the bottom, a URL is supplied to get to the goodies. Hell, it's even still live! :)
Hope that helps - enjoy it :)
Quote:Original post by ArKano22
http://www.cg.tuwien.ac.at/research/publications/2007/Habel_2007_IAG/Habel_2007_IAG-Preprint.pdf
Here´s a paper explaining one of the most practical grass shaders i´ve seen. It is simple enough to implement and the results are very good.
Two drawbacks:
-Looks good at grazing angles, when seen from above, like in a soccer game, you can see the reticle structure.
-The paper does not include glsl code, you´ll have to figure it out yourself. Only formulas explained.
An overhead alternative might be to employ a similar simple effect, placing a bunch of textured quads parallel to the ground, each representing a horizontal cross-section of the grass. Looks like crap from grazing angles, but overhead looks convincing, assuming that your blades of grass aren't completely vertical.
This method may be considerably faster and simpler to implement than parallax, and you could also shift the layers around a bit to produce the illusion of wind bending the blades of grass.
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