Convert pmx to x3d

What is the difference between .pmx and .x3d?

Description: PMX is a 3D model file format for the MikuMikuDance (MMD) animation software. It is used to store 3D mesh data, bone data, and other information necessary to animate and render 3D models in the MMD application. The PMX format is a binary file which can be either exported from or imported into MMD.; X3D (Extensible 3D) is a royalty-free open standard file format used to represent 3D computer graphics. It is used to store and interchange 3D model data, including surface geometry, color, animation, and metadata. X3D files are built on the XML standard, and can be viewed and edited with a variety of 3D modeling programs.