Odd OpenGL behavior when drawing a cube
3d, c, depth-testing, glut, opengl
Solution
Just solved my own problem by adding:
glEnable(GL_DEPTH_TEST);
to my code.
Problem
When I draw a cube with this code ``` glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glLoadIdentity(); gluLookAt( x, y, z, x+xp, y+yp, z+zp, 0.0f, 1.0f, 0.0f); glBegin(GL_QUADS); glColor3f(0.0f,1.0f,0.0f); glVertex3f( 1.0f, 1.0f,-1.0f); glVertex3f(-1.0f, 1.0f,-1.0f); glVertex3f(-1.0f, 1.0f, 1.0f); glVertex3f( 1.0f, 1.0f, 1.0f); glColor3f(1.0f,0.5,0.0f); glVertex3f( 1.0f,-1.0f, 1.0f); glVertex3f(-1.0f,-1.0f, 1.0f); glVertex3f(-1.0f,-1.0f,-1.0f); glVertex3f( 1.0f,-1.0f,-1.0f); glColor3f(1.0f,0.0f,0.0f); glVertex3f( 1.0f, 1.0f, 1.0f); glVertex3f(-1.0f, 1.0f, 1.0f); glVertex3f(-1.0f,-1.0f, 1.0f); glVertex3f( 1.0f,-1.0f, 1.0f); glColor3f(1.0f,1.0f,0.0f); glVertex3f( 1.0f,-1.0f,-1.0f); glVertex3f(-1.0f,-1.0f,-1.0f); glVertex3f(-1.0f, 1.0f,-1.0f); glVertex3f( 1.0f, 1.0f,-1.0f); glColor3f(0.0f,0.0f,1.0f); glVertex3f(-1.0f, 1.0f, 1.0f); glVertex3f(-1.0f, 1.0f,-1.0f); glVertex3f(-1.0f,-1.0f,-1.0f); glVertex3f(-1.0f,-1.0f, 1.0f); glColor3f(1.0f,0.0f,1.0f); glVertex3f( 1.0f, 1.0f,-1.0f); glVertex3f( 1.0f, 1.0f, 1.0f); glVertex3f( 1.0f,-1.0f, 1.0f); glVertex3f( 1.0f,-1.0f,-1.0f); glEnd(); ``` I get an odd cude drawing: and Even without gluLookAt() I still end up with an odd drawing. The weird thing is I used the exact same code in a python OpenGL project and had no trouble with it. So it seems to be a C error? It also seems like the first 2 quads (green and orange) are not being drawn at all.