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chrisdudeperson
05-15-2014, 06:42 AM
Hi guys,

Fairly new to OpenGL so apologies if the answer is simple!

I have this program which creates a square and moves a camera towards it:


#include <stdio.h>
#include <OpenGL/gl.h>
#include <GLUT/glut.h>
#include <stdlib.h>
#include <math.h>


float z = 0;


void display(void)
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glLoadIdentity();

gluLookAt(0.0,0.0,z, 0.0,0.0,1000.0, 0.0,1.0,0.0);
z += 1;

glBegin(GL_QUADS);
glColor3f(0.0,1.0,0.0);
glVertex3f(-200.0, -200.0, 1000.0);
glVertex3f(-200.0, 200.0, 1000.0);
glVertex3f(200.0, 200.0, 1000.0);
glVertex3f(200.0, -200.0, 1000.0);
glEnd();

glFlush();
glutSwapBuffers();
glutPostRedisplay();
}

void initgl()
{


glViewport(-200,-200, 200, 200);

glEnable(GL_DEPTH_TEST);

glMatrixMode(GL_PROJECTION);
glLoadIdentity();

gluPerspective(60,1, 1,2000);
glMatrixMode(GL_MODELVIEW);

}


int main(int argc, char* argv[])
{
glutInit(&argc, argv);
glutInitDisplayMode (GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);
glutInitWindowSize (500, 500);
glutInitWindowPosition (100, 100);
glutCreateWindow ("Flight Simulator");
initgl();
glutDisplayFunc(display);

glutMainLoop();
return 0;
}


Now it works as in the camera moves towards the square. However my issue is that it's movement is "steppy" i.e. not smooth until it get's closer to the square. I have tried smaller and bigger increments of movement and it doesn't make a difference

Any ideas on how to fix this?

Thanks
Chris

rakeshthp
05-19-2014, 11:06 PM
Hi,

Were you able to solve this issue?