Mastering GUI Programming with Python

Creating a 3D object

To make a 3D object, we need to draw the back and sides of our wedge object. We'll start by calculating the coordinates for the back of the wedge using a list comprehension:

        back_vertices = [            qtg.QVector3D(x.toVector2D(), -0.5)            for x in front_vertices]

To create the back face, we only need to copy each of the front face coordinates and move the z axis back a bit. So, we're using the QVector3D object's toVector2D() method to produce a new vector with only the x and y axes, then passing that to the constructor of a new QVector3D object along with a second argument specifying the new z coordinate.

Now, we'll pass this set of vertices to OpenGL and draw as follows:

        self.program.setAttributeArray( self.vertex_location, reversed(back_vertices)) ...