[x3d-public] errors in convertJsonToStl.js

[John Carlson]

I looked at my quaternion code today, and at quaternions and rotations on the web.  I am not quite sure how I came up with the code I did (I saw some video). I think I watched the wrong video, or I was smoking anxiety that day.  Currently, my converter converts lots of stuff to a plane, it looks like (see SuperCobra).

Can anyone point me to a reasonable open source implementation of quaternion rotations in JavaScript, Java, C or C++?  X_ITE or X3DOM? Ideally, the quaternions would fit into a 4x4 matrix stack, which is how I learned how to do transforms (I am not doing a perspective transform that I know of, so perhaps 3x3 is good enough).  Yes, I know that other implementations are probably more efficient. I’d like to try to get 4x4 transforms working first before optimizing.  4x4 transforms are NOT a requirement, however, just a nice to have.

John


Sent from Mail for Windows 10

From: John Carlson
Sent: Saturday, May 20, 2017 2:20 AM
To: Don Brutzman; X3D Graphics public mailing list
Subject: RE: errors in convertJsonToStl.js

New versions of X3D JSON, STL and PLY interoperability are here:

https://github.com/coderextreme/X3DJSONLD/blob/master/src/main/node/convertJsonToStl.js
https://github.com/coderextreme/X3DJSONLD/blob/master/src/main/node/convertPlyToJson.js
https://github.com/coderextreme/X3DJSONLD/blob/master/src/main/node/convertStlToJson.js

This mostly works with Indexed geometry.  I don’t handle PLY texture coordinates yet.

Contributions are welcome, particularly JSON to PLY…

John


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