3d models Lesson 31 - VRML 97--Magical Mystery Tour - Part 1

3d models Lesson 31 - VRML 97--Magical Mystery Tour - Part 1

A VRML world is a space. Among Albert Einstein's most brilliant insights was the notion that space without matter is meaningless, and may be said not to even exist. This ends up being true of VRML worlds in the most evident way. The entire sense of 3D Models space conveyed by navigation in a VRML world is attributable to the placement of virtual objects at locations in coordinate space. The viewer's perception that this a navigable navigable is due to the organized placement of objects, creating a coherent sense of distance relationships. A coherent space is fun and inviting to the user, and navigating it with a VRML browser is exciting and pleasurable.

The following is about the simplest coherent space imaginable. Cubes of different colors are arranged at poles around a central white sphere. The sphere is located at the center of world space, being at the center of the Transform node that holds all the objects. A yellow and a blue cube are 10 meters above and below it. A green and red cube are ten meters to the right and left. A magenta cube is ten meters in front of center and a cyan cube is 10 meters behind.

See if you can read the following code.

This code has one element we haven't seen before. The Viewpoint node contains information about the viewer's location and orientation in the scene. The concept of a viewpoint is pretty much the same as that of a camera in a 3D Models rendering application, but the word "viewpoint" is suggestive and appropriate. The viewer of a VRML world is virtually "in" the world, not merely observing it. It's this very sense of immersion that makes VRML attractive and exciting. If the author fails to create a Viewpoint, one is created by the browser at the default location of 0, 0, 10, and facing directly toward the origin. Thus a default Viewpoint is ten meters in front of the origin.

This won't work for our scene because we have an object (the magenta cube) at 0, 0, 10. To see the whole scene we have to move back another 3D Models meters to 0, 0, 30. Thirty meters in front is far enough out to frame the entire world. Adding a Viewpoint node allows us to override the default values.

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