A Cornell box is a scene used to test of the accuracy of graphics rendering software. The scene consists of a white floor, back wall, and ceiling, a red left wall, a green right wall, and an overhead light. Objects are often placed in the box. In this case, I’ve added a ball with a wireframe to show that it’s rotating properly.
Use the arrow keys to roll the ball around the box. Adjust the light’s intensity, distance, and color with the sliders at the top right.