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linapr
09-18-2013, 07:59 AM
I am trying to make 3D lorenz attractor but somehow not able to link it properly.

My code where it is showing problem is:

static void display(void)
{
int i;
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glLoadIdentity();
glRotated(ph,1,0,0);
glRotated(th,0,1,0);

glBegin(GL_LINESTRIP);
for (i=0;i<N;i++)
{
glColor3fv(color[i];
glVertex3fv(pa[1]);
}
glEnd();

glColor3f(1,1,1);
glBegin(GL_LINES);
glVertex3d(0,0,0);
glVertex3d(1,0,0);
glVertex3d(0,0,0);
glVertex3d(0,1,0);
glVertex3d(0,0,0);
glVertex3d(0,0,1);
glEnd();

glRasterPos3d(1,0,0);
Print("X");
glRasterPos3d(0,1,0);
Print("Y");
glRasterPos3d(0,0,1);
Print("Z");

glFlush();
glutSwapBuffers();
}


Error showing is:

/tmp/cc4Vqewz.o:attractor.c:function display: error: undefined reference to 'glcolor3fv'
/tmp/cc4Vqewz.o:attractor.c:function display: error: undefined reference to 'glvertex3d'
/tmp/cc4Vqewz.o:attractor.c:function display: error: undefined reference to 'glvertex3d'
/tmp/cc4Vqewz.o:attractor.c:function display: error: undefined reference to 'glvertex3d'
/tmp/cc4Vqewz.o:attractor.c:function display: error: undefined reference to 'glvertex3d'
/tmp/cc4Vqewz.o:attractor.c:function display: error: undefined reference to 'glprint'
/tmp/cc4Vqewz.o:attractor.c:function display: error: undefined reference to 'glprint'
/tmp/cc4Vqewz.o:attractor.c:function display: error: undefined reference to 'glprint'

The command I tried is gcc attractor.c -lm -lGL -lGLU -lglut

Kindly resolve the error. Thanks

carsten neumann
09-18-2013, 02:57 PM
Please use
around source code snippets. The error messages you posted refer to function names with all lower case letters, OpenGL functions use mixed case so that looks odd - do you have some macros #define'd that have the same name as OpenGL functions? Are those the first errors messages from the compiler/linker - in general it is often not very useful to look at any error but the very first, because they can be follow ups.

linapr
09-18-2013, 06:24 PM
https://mail-attachment.googleusercontent.com/attachment/?ui=2&ik=1ff9c5dc44&view=att&th=14133d0068768fa6&attid=0.2&disp=inline&realattid=f_hlpocw5m1&safe=1&zw&saduie=AG9B_P88oCxT5LIgEzraLZj0REiG&sadet=1379553830067&sads=lbn0YB7my0ahxMWIoF40MVZ7KQ0&sadssc=1



#include <math.h>
#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
#define GL_GLEXT_PROTOTYPES
#ifdef __APPLE__
#include <GLUT/glut.h>
#else
#include <GL/glut.h>
#endif

int th = 0;
int ph = 0;
double w = 1;

double a = 10.0;
double b = 28.0;
double c = 2.6666;

int N = 50000;
float pa[50000][3];
float color[50000][3];


static void display(void)
{
int i;
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glLoadIdentity();
glRotated(ph,1,0,0);
glRotated(th,0,1,0);

glBegin(GL_LINE_STRIP);
for (i=0;i<N;i++)
{
glcolor3fv(color[i]);
glVertex3fv(pa[i]);
}
glEnd();

glColor3f(1,1,1);
glBegin(GL_LINES);
glVertex3d(0,0,0);
glVertex3d(1,0,0);
glVertex3d(0,0,0);
glVertex3d(0,1,0);
glVertex3d(0,0,0);
glVertex3d(0,0,1);
glEnd();

glRasterPos3d(1,0,0);
Print("X");
glRasterPos3d(0,1,0);
Print("Y");
glRasterPos3d(0,0,1);
Print("Z");

glWindowPos2i(5,5);


glFlush();
glutSwapBuffers();
}


static void lorenz(void)
{
int i;
double x = pa[0][0] = 1;
double y = pa[0][1] = 1;
double z = pa[0][2] = 1;
double w = pa[0][3] = 1;
double dt = 0.01;

for (i=0;i<N;i++)
{
double dx = a*(y-x);
double dy = x*(b-z)-y;
double dz = x*y-c*z;

x += dt*dx;
y += dt*dy;
z += dt*dz;

pa[i+1][0] = x;
pa[i+1][1] = y;
pa[i+1][2] = z;
pa[i+1][3] = w;

color[i+1][0] = x;
color[i+1][1] = y;
color[i+1][2] = z;
}
}


void key(unsigned char ch,int x,int y)
{
if (ch == 27)
exit(0);
else if (ch == '0')
th = ph = 0;
else if (ch == 'q')
{
a += 1.0;
lorenz();
}
else if (ch == 'a')
{
a -= 1.0;
lorenz();
}
else if (ch == 'w')
{
b += 1.0;
lorenz();
}
else if (ch == 's')
{
b -= 1.0;
lorenz();
}
else if (ch == 'e')
{
c += 1.0;
lorenz();
}
else if (ch == 'd')
{
c -= 1.0;
lorenz();
}
else if (ch == '-')
{
w += 0.5;
lorenz();
}
else if (ch == '+')
{
w -= 0.5;
lorenz();
}
glutPostRedisplay();
}


static void special(int key, int x, int y)
{
if (key == GLUT_KEY_RIGHT)
th += 5;
else if (key == GLUT_KEY_LEFT)
th -= 5;
else if (key == GLUT_KEY_UP)
ph += 5;
else if (key == GLUT_KEY_DOWN)
ph -= 5;

th %= 360;
ph %= 360;

glutPostRedisplay();
}


static void reshape(int width, int height)
{
double w2h = (height>0) ? (double)width/height : 1;
int dim = 3;
glViewport(0,0, width,height);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(-dim*w2h,+dim*w2h,-dim,+dim,-dim,+dim);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
}


int main(int argc, char* argv[])
{
lorenz();
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE);
glutInitWindowPosition(50, 50);
glutInitWindowSize(500, 500);
glutCreateWindow("3D Lorenz Attractor");
glutDisplayFunc(display);
glutReshapeFunc(reshape);
glutSpecialFunc(special);
glutKeyboardFunc(key);
glutMainLoop();
return 0;
}




Please check where I am going wrong. Thank you so much

GClements
09-18-2013, 10:41 PM
Please check where I am going wrong.
Where you are going wrong is in not posting any relevant information, e.g. which platform you're using, or which compiler, or anything else which might be relevant.

linapr
09-19-2013, 07:11 AM
Thank you for your comment.

I am working on ubuntu with gcc compiler. I have submission today but seems like I won't be able to provide the working code. I am working on ubuntu 12.04 and has freeglut3-dev installed, binutils-gold is also installed. I hve no idea why this code is not working. What else do you want to know to help me out?

carsten neumann
09-19-2013, 03:06 PM
I've tried to compile what you posted, I get errors from the compiler - how did you get this to the linking stage? Anyway, in display:



glBegin(GL_LINE_STRIP);
for (i=0;i<N;i++)
{
glcolor3fv(color[i]);
glVertex3fv(pa[i]);
}
glEnd();


glcolor3fv is misspelled (no mixed case) and the function Print() used further down in display is nowhere defined.