But how far away from the scene - and where exactly - should the viewer be? We wanted to make sure that the final image of the scene contained a good view out the window, that a portion of the floor was visible, and that all the objects in the scene were not only visible but presented in an interesting arrangement. Obviously, we wanted to look at the corner of the room containing the globe. Also, a particular viewpoint had to be chosen. Each block was carefully positioned in the scene: Some blocks were scattered on the floor, some were stacked on top of each other on the table, and some were assembled to make the globe. The program that produced that image contained a single geometric description of a building block.

Look at the image on the cover of this book. You can use the default positioning and vantage point, but most likely you want to specify them. Now you must decide how you want to position the models in the scene, and you must choose a vantage point from which to view the scene.

Reverse or mimic the operations of the geometric processing pipelineĬhapter 2 explained how to instruct OpenGL to draw the geometric models you want displayed in your scene.

Combine multiple transformations to mimic sophisticated systems in motion, such as a solar system or an articulated robot arm.

Manipulate the appropriate matrix stacks that control model transformation for viewing and project the model onto the screen.

Clip undesired portions of the model out of the scene that's to be viewed.

Control the location in three-dimensional space from which the model is viewed.

View a geometric model in any orientation by transforming it in three-dimensional space.

After reading this chapter, you'll be able to do the following:

Opengl 4.4 book