Drawing cube 3D using Opengl
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You need to do a few things:
- Pass
specialKeys
intoglutSpecialFunc()
, notglutDisplayFunc()
- Set the
GL_PROJECTION
andGL_MODELVIEW
matrices - Move the camera back a bit
- Add a
glutSwapBuffers()
to the end ofdisplay()
Example:
#include <GL/glut.h>
float ver[8][3] =
{
{-1.0,-1.0,1.0},
{-1.0,1.0,1.0},
{1.0,1.0,1.0},
{1.0,-1.0,1.0},
{-1.0,-1.0,-1.0},
{-1.0,1.0,-1.0},
{1.0,1.0,-1.0},
{1.0,-1.0,-1.0},
};
GLfloat color[8][3] =
{
{0.0,0.0,0.0},
{1.0,0.0,0.0},
{1.0,1.0,0.0},
{0.0,1.0,0.0},
{0.0,0.0,1.0},
{1.0,0.0,1.0},
{1.0,1.0,1.0},
{0.0,1.0,1.0},
};
void quad(int a,int b,int c,int d)
{
glBegin(GL_QUADS);
glColor3fv(color[a]);
glVertex3fv(ver[a]);
glColor3fv(color[b]);
glVertex3fv(ver[b]);
glColor3fv(color[c]);
glVertex3fv(ver[c]);
glColor3fv(color[d]);
glVertex3fv(ver[d]);
glEnd();
}
void colorcube()
{
quad(0,3,2,1);
quad(2,3,7,6);
quad(0,4,7,3);
quad(1,2,6,5);
quad(4,5,6,7);
quad(0,1,5,4);
}
double rotate_y = 0;
double rotate_x = 0;
void specialKeys( int key, int x, int y )
{
if (key == GLUT_KEY_RIGHT)
rotate_y += 5;
else if (key == GLUT_KEY_LEFT)
rotate_y -= 5;
else if (key == GLUT_KEY_UP)
rotate_x += 5;
else if (key == GLUT_KEY_DOWN)
rotate_x -= 5;
glutPostRedisplay();
}
void display()
{
glClearColor( 0, 0, 0, 1 );
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
glMatrixMode( GL_PROJECTION );
glLoadIdentity();
int w = glutGet( GLUT_WINDOW_WIDTH );
int h = glutGet( GLUT_WINDOW_HEIGHT );
gluPerspective( 60, w / h, 0.1, 100 );
glMatrixMode( GL_MODELVIEW );
glLoadIdentity();
gluLookAt
(
3, 3, 3,
0, 0, 0,
0, 0, 1
);
glRotatef( rotate_x, 1.0, 0.0, 0.0 );
glRotatef( rotate_y, 0.0, 1.0, 0.0 );
colorcube();
glutSwapBuffers();
}
int main( int argc, char **argv )
{
glutInit( &argc, argv );
glutInitDisplayMode( GLUT_RGBA | GLUT_DEPTH | GLUT_DOUBLE );
glutInitWindowSize( 640, 480 );
glutCreateWindow( "GLUT" );
glutDisplayFunc( display );
glutSpecialFunc( specialKeys );
glEnable( GL_DEPTH_TEST );
glutMainLoop();
return 0;
}
Author by
eleen
Updated on March 25, 2021Comments
-
eleen about 3 years
I want to draw a 3D cube using OpenGL this is my code how can correct error
float ver[8][3] = { {-1.0,-1.0,1.0}, {-1.0,1.0,1.0}, {1.0,1.0,1.0}, {1.0,-1.0,1.0}, {-1.0,1.0,-1.0}, {1.0,1.0,-1.0}, }; GLfloat color[8][3] = { {0.0,0.0,0.0}, {1.0,0.0,0.0}, {1.0,1.0,0.0}, {0.0,1.0,0.0}, {1.0,1.0,1.0}, {0.0,1.0,1.0}, }; void quad(int a,int b,int c,int d) { glBegin(GL_QUADS); glColor3fv(color[a]); glVertex3fv(ver[a]); glColor3fv(color[b]); glVertex3fv(ver[b]); glColor3fv(color[d]); glVertex3fv(ver[d]); glEnd(); } void colorcube() { quad(0,3,2,1); quad(2,3,7,6); } void display(){ // Clear screen and Z-buffer glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT); // Reset transformations glLoadIdentity(); colorcube(); } int main( int argc, char **argv ) { glutInit( &argc, argv ); glutInitDisplayMode( GLUT_RGBA | GLUT_DEPTH | GLUT_DOUBLE ); glutInitWindowSize( 640, 480 ); glutCreateWindow( "GLUT" ); glutDisplayFunc( display ); glutDisplayFunc(specialKeys); glEnable( GL_DEPTH_TEST ); glutMainLoop(); return 0; }