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Measurement
One of the most important decisions you need to make is what scale of measurement you are going to use. The point is that VRML requires decimal measurements. If you use the Metric System, then there will not be any problem, but if you intend to use feet and inches, then brush up on decimals. You can not use 1/2. It must be 0.5.
Another reason you will want to standardize your scale is that, sooner or later, you will want to reuse the file for some other VRML project.