3D math function

OpenGL
1

Does anyone help me with making a 3D function z=sin(x+t)+cos(y+t), where ‘t’ is changing time, and where you can change a density of the triangle mesh? I’m very beginner and don’t know how to solve this problem. :* to all

2

some pseudo code to outline the idea :

// example spacing of the grid
delta = 1.0
t = time

for x starting at 0 ending at XMAX, delta spacing {
 glBegin(GL_QUAD_STRIP)
  for y starting at 0 ending at YMAX, delta spacing {
   glVertex3d(x+t,y+t,sin(x+t)+cos(y+t));
   glVertex3d(x+t+delta,y+t,sin(x+t+delta)+cos(y+t));
  }
 glEnd();
}

And next time, just do your homework. There is plenty of doc everywhere for such a basic setup.

3

I guess what you mean is to make an application that visualizes such function, right?

If you’re new to OpenGL, start with nehe tutorials:
http://nehe.gamedev.net

If you need specific suggestions for your application you would have to provide a bit more detail. Is it an application where user can rotate view or change density of triangle grid in realtime? How large grids do you need? Is performance important?

4

And next time, just do your homework. There is plenty of doc everywhere for such a basic setup. [/QB][/QUOTE]

5

"And next time, just do your homework. There is plenty of doc everywhere for such a basic setup. "

This is really my homework:) and no time to learn about it ;(
Thanks for the code, I will try to do something with this clue.

6

Originally posted by k_szczech:
[b] I guess what you mean is to make an application that visualizes such function, right?

If you’re new to OpenGL, start with nehe tutorials:
http://nehe.gamedev.net

If you need specific suggestions for your application you would have to provide a bit more detail. Is it an application where user can rotate view or change density of triangle grid in realtime? How large grids do you need? Is performance important? [/b]
Yes, I have to do something that will visualizes this function, the most important is to change density of triangle grid in realtime using keyborad.

7

Czy ktoś wykonałby taki projekt? Najlepiej z Warszawy.

8

Originally posted by zuleja:
[b] "And next time, just do your homework. There is plenty of doc everywhere for such a basic setup. "

This is really my homework:) and no time to learn about it ;(
Thanks for the code, I will try to do something with this clue. [/b]
Well then, I suppose the next suggestion is Next time, do your homework sooner. :wink:

9

OK, This is what I would do:

#define DENSITY 50
#define DENSITY_STEP 1.0/DENSITY
#define LATTICE_WIDTH 10.0

for(i = 0; i < 1.0/(float)DENSITY; i++){
    glBegin(GL_TRIANGLE_STRIP);
    glVertex3f(LATTICE_WIDTH*i, LATTICE_WIDTH*(j+DENSITY_STEP), sin(LATTICE_WIDTH*i + t) + cos(LATTICE_WIDTH*(j+DENSITY_STEP) + t));
    glVertex3f(LATTICE_WIDTH*i, LATTICE_WIDTH*j, sin(LATTICE_WIDTH*i + t) + cos(LATTICE_WIDTH*j + t));    
    for(j = 0; j < 1.0/(float)DENSITY; j++){
        glVertex3f(LATTICE_WIDTH*(i+DENSITY_STEP), LATTICE_WIDTH*(j+DENSITY_STEP), sin(LATTICE_WIDTH*(i+DENSITY_STEP) + t) + cos(LATTICE_WIDTH*(j+DENSITY_STEP) + t));
        glVertex3f(LATTICE_WIDTH*(i+DENSITY_STEP), LATTICE_WIDTH*j, sin((i+DENSITY_STEP) + t) + cos(j + t));        
    }
    glEnd();
}

hope it helps(and that I wrote this correct…)! And…Do your homework next time!

10

Ow, define i and j as floats!OK, I wrote this in a hurry but I hope you get the idea