How to convert between two coordinate systems?

[Mugen87]

Have you already studied the following topic?

Convert from one coordinate system to another?

Math is my weakness. Suppose I receive data from somewhere, and I want to render it in a Three.js scene. The data assumes that X is forward, Y is left, and Z is up, while Three.js assumes (based on the default camera view) that Z is backward, X is right, and Y is up. The data that I get are positions, and quaternions (XYZW) in that other coordinate system. Can we derive a transform matrix that can convert everything into the Three.js coordinate system? In the data coordinate system, for exa…

There are also some code snippets that might help.