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Index › Programming Questions & Help › OpenGL and 3D Libraries › Wave on a simple grid... how to

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Wave on a simple grid... how to? (Read 1352 times)

noflux

Wave on a simple grid... how to?
Oct 6^th, 2005, 12:11am

Hi. I'm trying ti implement a wave animation on a simple grid like this:

for(int i=0; i<height; i+=10) {
for(int j=50; j<width-50; j+=10) {
rectMode(CENTER);
rect(j, i, 5, 5);
}
}

... the starting point of the wave it would be the center of the grid, and the "look and feel" it would be like a "rock droping on water"... using something like:

pushMatrix();
translate(0, 0 ,"wave thing values");
rect (......);
popMatrix();

the initial "power" of the wave could be generated from the amount of time the center square of the grid is "pressed" by the mouse..or some other kind of dinamic input.

can someone help me by pointing some examples of wave animation or the correct math/code to do this?

thanx

//--noflux.org--\\&&

st33d

Re: Wave on a simple grid... how to?
Reply #1 - Oct 6^th, 2005, 1:48am

Code:


float amplitude = 1.0;
float wavelength = 20.0;
float t = 0.0;
void setup(){
  size(400,400,P3D);
  ellipseMode(CENTER);
}
void draw(){
  //background(200);
  float waveHeight = sin((TWO_PI/wavelength)*t)*amplitude;
  translate(width/2,height/2,waveHeight);
  rotateX(PI/4);
  ellipse(0,0,t,t);
  t += 0.1;
}

Got a basic wave form for yer. I think the trick is to use sine to figure out how those waves are doing.

Haven't got an idea for a grid transformation this late in the day just yet. What would we have to do? Place listeners on grid points perhaps? What do you think guys?

st33d

Re: Wave on a simple grid... how to?
Reply #2 - Oct 7^th, 2005, 7:36pm

I have a grid class and a wave transformation for the grid called ripple().

WaveGrid

I'm using a quad grid here noflux because you'll be able to manipulate the corners a bit easier. If you want to effect it across tiles just dump rects at those grid points. The advantage with quads though is that you can map textures to them and do some really funky stuff. All fairly straight forward. I can't figure out how to make the wave roll along the surface or die out though. I'm suffering a bit of a brain block. Any clues

st33d God Member Offline Posts: 666	Re: Wave on a simple grid... how to? Reply #3 - Oct 8^th, 2005, 12:23pm Nevermind, fixed it. Same link.

noflux YaBB Newbies Offline Posts: 6	Re: Wave on a simple grid... how to? Reply #4 - Oct 10^th, 2005, 9:59pm Thanx for the math this is a realy big help.
	//--noflux.org--\\&&

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