OpenGL Particle Engine Demo

This is a discussion on OpenGL Particle Engine Demo within the A Brief History of Cprogramming.com forums, part of the Community Boards category; My first extremely basic demo! It just shows a brief particle engine. It shows 52 red particles move positively on ...

  1. #1
    Banned frenchfry164's Avatar
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    OpenGL Particle Engine Demo

    My first extremely basic demo! It just shows a brief particle engine. It shows 52 red particles move positively on the x and z axes, and then fade out when they get close to the screen. It is completely crappy, but I just hacked it together in like a half hour. No, I won't release source, because, as I said, it was a hack and I'd be embarrassed to show this crap.

    edit: If you're browser gets confused and thinks the filename is particle and not particle engine.zip, open it with a zip file thing-a-ma-bob

    PS: You need GLUT to get this to work.
    Attached Files Attached Files
    Last edited by frenchfry164; 11-24-2003 at 08:05 PM.

  2. #2
    The Defective GRAPE Lurker's Avatar
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    Not really too much you can say about it WITHOUT the code...umm maybe good job ?
    Do not make direct eye contact with me.

  3. #3
    Banned frenchfry164's Avatar
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    Code:
    #include <cstdlib>
    #include <ctime>
    #include "particle.h"
    #include <gl/gl.h>
    inline float FloatRand(float MaxVal)
    {
        return float(rand()%100)/((100/MaxVal)+0.1);
    }
    
    ParticleEffect::ParticleEffect(int no, float x, float y, float z, float size,
                                   float speedx, float speedy, float speedz, float life,
                                   float fade, float r, float g, float b, float a, float perm,
                                   bool forever)
    {
        srand(time(0));
        particles = new Particle[no];
        for (int i=0;i<no;i++)
        {
            particles[i].x = (x-(0.5*size))+FloatRand(size);
            particles[i].y = (y-(0.5*size))+FloatRand(size);
            particles[i].z = (z-(0.5*size))+FloatRand(size);
            particles[i].life = (life-(0.5*fade))+FloatRand(fade);
            particles[i].r = r;
            particles[i].g = g;
            particles[i].b = b;
            particles[i].a = a;
            particles[i].speedx = (speedx-(0.25*speedx))+FloatRand(0.25*speedx);
            particles[i].speedy = (speedy-(0.25*speedy))+FloatRand(0.25*speedy);
            particles[i].speedz = (speedz-(0.25*speedz))+FloatRand(0.25*speedz);
            particles[i].fade = (fade-(0.15*fade))+FloatRand(fade*0.15);
            particles[i].perimeter = perm;
        }
        count = no;
        endless = forever;
        this->x=x;
        this->y=y;
        this->z=z;
        this->life=life;
        this->fade=fade;
        this->size=size;
        this->r=r;
        this->g=g;
        this->b=b;
        this->a=a;
        this->speedx = speedx;
        this->speedy = speedy;
        this->speedz = speedz;
        this->perimeter = perimeter;
    }
    
    void ParticleEffect::Render()
    {
        for (int i=0;i<count;i++)
        {
            if (particles[i].life <= 0)
            {
                particles[i].x = (x-(0.5*size))+FloatRand(size);
                particles[i].y = (y-(0.5*size))+FloatRand(size);
                particles[i].z = (z-(0.5*size))+FloatRand(size);
            particles[i].life = (life-(0.5*fade))+FloatRand(fade);
            particles[i].r = r;
            particles[i].g = g;
            particles[i].b = b;
            particles[i].a = a;
            particles[i].speedx = (speedx-(0.5*speedx))+FloatRand(0.5*speedx);
            particles[i].speedy = (speedy-(0.5*speedy))+FloatRand(0.5*speedy);
            particles[i].speedz = (speedz-(0.5*speedz))+FloatRand(0.5*speedz);
            particles[i].fade = (fade-(fade))+FloatRand(fade);
            particles[i].perimeter = perimeter;
            }
            glBegin(GL_QUADS);  
                glColor4f(particles[i].r, particles[i].g, particles[i].b, particles[i].a + (particles[i].life/2));
                glVertex3f(particles[i].x - (particles[i].perimeter*0.5),
                           particles[i].y + (particles[i].perimeter*0.5), particles[i].z);
                glVertex3f(particles[i].x + (particles[i].perimeter*0.5),
                           particles[i].y + (particles[i].perimeter*0.5), particles[i].z);
                glVertex3f(particles[i].x + (particles[i].perimeter*0.5),
                           particles[i].y - (particles[i].perimeter*0.5), particles[i].z);
                glVertex3f(particles[i].x - (particles[i].perimeter*0.5),
                           particles[i].y - (particles[i].perimeter*0.5), particles[i].z);         
            glEnd();
            
            particles[i].life -= particles[i].fade;
            particles[i].x += particles[i].speedx;
            particles[i].y += particles[i].speedy;
            particles[i].z += particles[i].speedz;
        }
    }
    As you can see, it's a hack. It's extremely ugly. It makes me want to puke just seeing it.

  4. #4
    Guest Sebastiani's Avatar
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    >> PS: You need GLUT to get this to work.


    Next time, include it with the package.
    Code:
    #include <cmath>
    #include <complex>
    bool flip(bool value)
    {
           return std::pow
        (
            std::complex<float>(std::exp(1.0)), 
            std::complex<float>(0, 1) * std::complex<float>(std::atan(1.0)*(1 << (value + 2)))
        ).real() < 0;
    }

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