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POcreating a 3d cube and bouncing balls
 

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  1. POcreating a 3d cube and bouncing balls
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    <p>I'm writing a program in OpenGL, I'm drawing a simple cube 3D and I want to add bouncing balls so that they bounce inside the walls of the cube, I tried to add a ball class and the following code:</p> <pre><code> GLfloat WHITE[] = {1, 1, 1}; GLfloat RED[] = {1, 0, 0}; GLfloat GREEN[] = {0, 1, 0}; GLfloat MAGENTA[] = {0, 0, 1}; class Ball { double radius; GLfloat* color; double maximumHeight; double x; double y; double z; int direction; public: Ball(double r, GLfloat* c, double h, double x, double z): radius(r), color(c), maximumHeight(h), direction(-1), y(h), x(x), z(z) { } void update() { y += direction * 0.05; if (y &gt; maximumHeight) { y = maximumHeight; direction = -1; } else if (y &lt; radius) { y = radius; direction = 1; } glPushMatrix(); glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, color); glTranslated(x, y, z); glutSolidSphere(radius, 30, 30); glPopMatrix(); } }; Ball balls[] = { Ball(0.5, GREEN, 7, 6, 1), Ball(0.5, MAGENTA, 6, 3, 4), Ball(0.5, WHITE, 5, 1, 7) }; </code></pre> <p>and in the display function I added this:</p> <pre><code> for (int i = 0; i &lt; sizeof balls / sizeof(Ball); i++) { balls[i].update(); } </code></pre> <p>This is my cube code:</p> <pre><code>void display(); void specialKeys(); double rotate_y=0; double rotate_x=0; void display(){ glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT); glLoadIdentity(); glRotatef( rotate_x, 1.0, 0.0, 0.0 ); glRotatef( rotate_y, 0.0, 1.0, 0.0 ); glBegin(GL_POLYGON); glColor3f( 1.0, 0.0, 0.0 ); glVertex3f( 0.5, -0.5, -0.5 ); // P1 is red glColor3f( 0.0, 1.0, 0.0 ); glVertex3f( 0.5, 0.5, -0.5 ); // P2 is green glColor3f( 0.0, 0.0, 1.0 ); glVertex3f( -0.5, 0.5, -0.5 ); // P3 is blue glColor3f( 1.0, 0.0, 1.0 ); glVertex3f( -0.5, -0.5, -0.5 ); // P4 is purple glEnd(); glBegin(GL_POLYGON); glColor3f( 1.0, 1.0, 1.0 ); glVertex3f( 0.5, -0.5, 0.5 ); glVertex3f( 0.5, 0.5, 0.5 ); glVertex3f( -0.5, 0.5, 0.5 ); glVertex3f( -0.5, -0.5, 0.5 ); glEnd(); glBegin(GL_POLYGON); glColor3f( 1.0, 0.0, 1.0 ); glVertex3f( 0.5, -0.5, -0.5 ); glVertex3f( 0.5, 0.5, -0.5 ); glVertex3f( 0.5, 0.5, 0.5 ); glVertex3f( 0.5, -0.5, 0.5 ); glEnd(); glBegin(GL_POLYGON); glColor3f( 0.0, 1.0, 0.0 ); glVertex3f( -0.5, -0.5, 0.5 ); glVertex3f( -0.5, 0.5, 0.5 ); glVertex3f( -0.5, 0.5, -0.5 ); glVertex3f( -0.5, -0.5, -0.5 ); glEnd(); glBegin(GL_POLYGON); glColor3f( 0.0, 0.0, 1.0 ); glVertex3f( 0.5, 0.5, 0.5 ); glVertex3f( 0.5, 0.5, -0.5 ); glVertex3f( -0.5, 0.5, -0.5 ); glVertex3f( -0.5, 0.5, 0.5 ); glEnd();*/ glBegin(GL_POLYGON); glColor3f( 1.0, 0.0, 0.0 ); glVertex3f( 0.5, -0.5, -0.5 ); glVertex3f( 0.5, -0.5, 0.5 ); glVertex3f( -0.5, -0.5, 0.5 ); glVertex3f( -0.5, -0.5, -0.5 ); glEnd(); glFlush(); glutSwapBuffers(); } 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(); } int main(int argc, char* argv[]){ glutInit(&amp;argc,argv); glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH); glutCreateWindow("Awesome Cube"); glEnable(GL_DEPTH_TEST); glutDisplayFunc(display); glutSpecialFunc(specialKeys); glutMainLoop(); return 0; } </code></pre>
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    2. VO
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    1. COI think you miss your question? :)
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      1. USNayana Adassuriya
    2. COSo what happened?
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      1. USBrett Hale
    3. COnothings is showing not even the bouncing balls
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