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Wind Bag (Composition by gtoledo3)
This is just one I have a great deal of fun with, and is kind of a workout of the GL Tools polygon mode, logic op, and GLSL vertex shading. I posted this on my "qc twit" blog... but I see that bandwidth must not be concerning Chris and Steve too much if they are now creating this section ;o) |
Nicely customizable
this one is cool looks kind of like your noise sphere but with lines. i have been messing with the gl tools lately. actually trying to learn the core bit of glsl im on page 45 of the manual, looks a lot like c still trying to sort out varying and uniform etc.. thanks for the example they are helpful george.
A uniform is a value that doesn't change for the vertex shader or the fragment shader. These are inputs on the GLSL patch (numbers, images, etc).
A varying is a value that the Vertex Shader writes and passes to the Fragment shader. If you were to do per-pixel lighting, for example, you'd need each pixel's normal. So you'd have the Vertex Shader pass the normal to the fragment shader via a varying. Varyings are linearly interpolated across a polygon's surface, so if you set a value of 1 at one vertex, and a value of 0 at another, fragments between those two vertices will each get unique values between 1 and 0.
(I'm not sure if matrices can be varyings -- I believe so, but I'm not sure how they're interpolated if they are)
I don't think matrices can be varyings. It's just floats and vec2/3/4 as far as I know. Nothing else makes sense, really.
a|x
Hey, that one rocks!
I love the magic mirror kind of twisting & turning transitions. Reminded me of just how powerful and simple the smooth patch is for it's effort. I need to start using it much more. Thanks for posting the source gtoledo3.
Indeed... yeah, go to textured mode, and you basically have the noise sphere.
Interesting... I've recall seeing this come up on the list (I think)...
I seem to recall the GLSL spec supporting varying matrices somehow, but I've never gotten that far into it (that aspect of GLSL). It seems like I messed with this one day (experimental mode, learning hat stuff), and kept getting the dreaded pink box, but I can't say I totally knew what I was doing either.