How to move vertices up/down randomly in shader.

Question

Hello!

I have a plane and I'd like to adjust the y positions of the vertices in the shader. Actually moving them is simple enough, but I was wondering what the best way of getting the random values for heights was?

Would I need a random function inside the shader to get a value wit$$anonymous$$n a range?

Thanks

Answer 1

Hey bud, Are you trying to scroll your texture with the shader or somet$$anonymous$$ng like that ? You would be looking to do t$$anonymous$$s in the Surf shader function

You could call to the _Time property and multiply it by a set of values based on the x and y you set it. yo could then effect them with random values passed into the vars holding the x and y values. I could go on. the code would look similar to t$$anonymous$$s...

 fixed yScrollValue = _ScrollYSpeed * _Time;

you might make _ScrollYSpeed an accessible parameter in the inspector for the shader allowing you to adjust/tweak it visually afterwards.

You could be looking for a a small function to run on a float in your code like so....

 float randomNum(in float2 uv)
 
     float2 noise = (frac(sin(dot(uv ,float2(12.9898,78.233)*2.0)) * 43758.5453));
     return abs(noise.x + noise.y) * 0.5;
 }

but without your code, who knows ? Then again, who even knows, if you are using Unitys shader language, Cg, HLSL ?

So... Could you possibly add in your shader code please, so we can get to the bottom of it faster for you.

Hope that helps some Take care Bud Gruffy

How to move vertices up/down randomly in shader.

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