Notes:

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There are many development tools that can be used to built X3D worlds. Text-based tools will always work, though they do not provide the most friendly interface. VRMLPad and X3D-Edit are language- and context-aware tools that speed up the development process.

X3D/VRML translators are useful when valid VRML codes needs to be converted to XML-based X3D or vice versa.

The last two tools are meant to assist in the development process. Chisel is an optimizer. Rez handles terrain data conversions.