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Getting Started in 3D

In our class example, we used GLUT to display some simple 3D geometric primitives. To use GLUT, we needed to include a new import statement at the top of our source code.

from __future__ import division
from OpenGL.GL import *
from OpenGL.GLU import *
from OpenGL.GLUT import * # <----  New Import for GLUT
import numpy as np
import pygame

We also had to add a couple lines of code to our OpenGL init function to setup our 3D viewing volume.

class GLContext( ):
    def __init__( self, screen):
        self.aspect=screen.get_width()/screen.get_height() #Calculates and stores our aspect ratio
        gluPerspective(45.0, self.aspect, 0.1, 200.0) #sets up our 3D perspective view

Now, we are ready to start drawing some 3D objects. We'll start by just looking a glutWireCube. In the code below we can see that we're translating our cube -1.0 unit in depth and then we rotate it 20 degrees about the X-axis, 30 degrees about the Y-axis, and 40 degrees about the Z-axis. The following code will need to be placed in the display() function that we discussed in the previous set of examples.

        glPushMatrix() #stores previous transformation matrix
        glTranslatef(0.0, 0.0, -1.0) #trasnlates scene -1.0 units in depth (away from the camera)
        glRotatef(20.0, 1, 0, 0) #20deg rotation around the x-axis 
        glRotatef(30.0, 0, 1, 0) #30deg rotation around the y-axis
        glRotatef(40.0, 0, 0, 1) #49deg rotation around the z-axis
        glutWireCube(0.5) #draws a wireframe cube of width 0.5 units
        glPopMatrix() #restores previous transformation matrix

The resulting image from this example should look like this:

tutorials/ffopengl_3d.txt · Last modified: 2021/08/01 00:48 by jones