A VRML world is a text file. The controls below change numbers in that text, and the world changes with them. The marked numbers are the ones each control changes.
Result
Live world loads when you scroll here
lesson-1-shape.wrlVRML97250 bytes
Web preview: X_ITE 16.4.1Native viewer: FreeWRL
Change
Lesson 01 Make a shape
One shape. Change its kind, its size and its colour.
Every VRML97 file starts with the line #VRML V2.0 utf8.
A Shape has two parts. appearance says how it looks. geometry says what it is.
diffuseColor takes three numbers from 0 to 1: red, green and blue. 1 0 0 is pure red.
Save the file and open it in FreeWRL. It is the same world.
§05
After lesson 04
Look at bigger worlds in the Lab, and read their source. The X3D specification lists every node: ISO/IEC 19775-1 at web3d.org. When you make something, share it. Good lesson worlds can become examples on this site.