Configuring some WebGL properties

Here we set the background color and the depth test properties as follows:

gl.clearColor(0.3,0.3,0.3, 1.0);
gl.clearDepth(1.0);
gl.enable(gl.DEPTH_TEST);
gl.depthFunc(gl.LEQUAL);

Setting up the camera

The camera variable needs to be global so we can access it later on from the GUI functions that we will write. For instance, we want to be able to click on a button (different function in the code) and use the camera variable to update the camera position:

camera = new Camera(CAMERA_ORBITING_TYPE);
camera.goHome([0,0,7]);
camera.setFocus([0.0,0.0,0.0]);
camera.setAzimuth(25);
camera.setElevation(-30);

The azimuth and elevation of the camera are relative to the negative z-axis, which will be the default pose if you do not specify any other. An azimuth of 25 degrees and elevation of -30 degrees will give you a nice initial angle to see the cars. However, you can set any combination that you prefer as the default pose in here.

Here we make sure that the camera's rendering...