[x3d-public] vrml conversions

[Andreas Plesch]

Another vrml conversion from http://bulatov.org/vrml/easter/index.html

https://andreasplesch.github.io/Library/Viewer/index.html?url=https://gist.githubusercontent.com/andreasplesch/df593e4f82b3fbd99148583ecb235edd/raw/7d3caceb31b83484711d56bc00d4c5d8107fa6bf/egg10.x3d

A few interesting x3dom related aspects here are:

- Protos work pretty well in x3dom, even if complicated
- For IS protofields it is sometimes necessary to provide appropriate
default values also in the Protobody (not just in the ProtoInterface)
in case the x3d default values cause problems. This happened here
because the TextureCoordinate node does not have point coordinates by
default. x3dom probably should ignore TextureCoordinate nodes with an
empty point field and treat that as if there is no TextureCoordinate
node.
- X3D scripts can be converted to DOM javascripts almost 1:1. ROUTEs
become the onoutputchange attribute with a function to call for the
fromNode, and the script itself finds the toNode in directOutput
style. The conversion shows a more complicated example which includes
use of wrapper function to avoid global (page wide) variables.
- HTML weirdness: Script DOM nodes generated 'from scratch' and then
appended to the page document execute when this happens. However,
Script DOM nodes generated with the builtin DOMParser or with
outer/innerHTML parsing are marked and do not execute when appended to
the page document. There is another, more obscure parsing method which
does generate executable Script nodes. This is what the editor now
uses.

Andreas

On Sat, Aug 5, 2023 at 4:44 PM Andreas Plesch <andreasplesch at gmail.com> wrote:
>
> Slightly adapted from http://bulatov.org/vrml/:after conversion to xml
> with x-ite:
>
> https://andreasplesch.github.io/Library/Viewer/index.html?url=https://gist.githubusercontent.com/andreasplesch/df593e4f82b3fbd99148583ecb235edd/raw/821419402327bd6927d2701174a29c5d078edc18/eversion.x3d
>
> https://andreasplesch.github.io/Library/Viewer/index.html?url=https://gist.githubusercontent.com/andreasplesch/df593e4f82b3fbd99148583ecb235edd/raw/3af8bc0d53e157c9289eb18831672f8ef1ca033a/dodecahedron.x3d
>
> Cheers, Andreas
> --
> Andreas Plesch
> Waltham, MA 02453



-- 
Andreas Plesch
Waltham, MA 02453