teaching machines

CS 455 Lecture 11 – Perspective and Camera

February 26, 2013 by Chris Johnson. Filed under cs455, lectures, spring 2013.

Before Class

Perspective

• Watch http://youtu.be/k3dhGlAx_DA.
• For another perspective, read http://www.songho.ca/opengl/gl_projectionmatrix.html.

Camera

• Watch http://youtu.be/-c62eQ_QpBE.
• For a similar implementation, read http://ogldev.atspace.co.uk/www/tutorial13/tutorial13.html.

In Class

• It’s time to test out that perspective projection with long corridors. Your task in this class is to code up a maze traverser. Grab the maze.obj file in W455. The entrance to the maze starts roughly at (0, 0, 0) in object space. Apply no extra transformations, i.e., object space = world space. Put a camera in your scene, standing at (0, 0, 1) and looking at the entrance. Advance and strafe and yaw your way through.
• The maze model has a lot of overlapping triangles, which will look terrible when you render it. Issue glEnable(GL_CULL_FACE) to disable drawing faces that point away from the viewer.
• For lighting, use a headlamp. That is, put the light_position at (0, 0, 0), the same as the eye’s position in eye space. The effect is that the light source will move as the eye moves, a great feature for tunnel traversing.