[x3d-public] bilinear and coincident Extrusion spines

[Holger Seelig]

The question is what can be done to prevent this.

Data URL will work (first bas64, then URL encode):
https://create3000.github.io/x_ite/playground/?url=data:text/plain;base64,PFgzRD4KICA8U2NlbmU%2BCiAgICAgICAgPFNoYXBlPgogICAgICAgICAgPEFwcGVhcmFuY2U%2BCiAgICAgICAgICAgIDxNYXRlcmlhbCBkaWZmdXNlQ29sb3I9JzAuMSAwIDAuOCcvPgogICAgICAgICAgPC9BcHBlYXJhbmNlPgogICAgICAgICAgPEV4dHJ1c2lvbiBiZWdpbkNhcD0nZmFsc2UnIGVuZENhcD0nZmFsc2UnIHNjYWxlPScxIDEgMS4yIDEuMiAxLjQgMS40JyBzb2xpZD0nZmFsc2UnIHNwaW5lPScwIDAgMCAwIDEgMCAwIDAgMC4wMScvPgogICAgICAgIDwvU2hhcGU%2BCiAgPC9TY2VuZT4KPC9YM0Q%2B

Here is another edge case where the SPC axis changes to much:

https://create3000.github.io/x_ite/playground/?url=https://create3000.github.io/Library/Tests/Components/Extrusion/wrong2.x3d

https://andreasplesch.github.io/Library/Viewer/index.html?url=https://create3000.github.io/Library/Tests/Components/Extrusion/wrong2.x3d

But there was an old VRML viewer, which can this (see image). I don’t know what these people have done, seems it was not documented:


—
Holger Seelig
holger.seelig at yahoo.de


> Am 11.07.2025 um 16:45 schrieb Andreas Plesch <andreasplesch at gmail.com>:
> 
> url=data:text/plain;base64, <https://andreasplesch.github.io/Library/Viewer/index.html?url=data:text/plain;base64,PFgzRD4KICA8U2NlbmU+CiAgICAgICAgPFNoYXBlPgogICAgICAgICAgPEFwcGVhcmFuY2U+CiAgICAgICAgICAgIDxNYXRlcmlhbCBkaWZmdXNlQ29sb3I9JzAuMSAwIDAuOCcvPgogICAgICAgICAgPC9BcHBlYXJhbmNlPgogICAgICAgICAgPEV4dHJ1c2lvbiBiZWdpbkNhcD0nZmFsc2UnIGVuZENhcD0nZmFsc2UnIHNjYWxlPScxIDEgMS4yIDEuMiAxLjQgMS40JyBzb2xpZD0nZmFsc2UnIHNwaW5lPScwIDAgMCAwIDEgMCAwIDAgMC4wMScvPgogICAgICAgIDwvU2hhcGU+CiAgPC9TY2VuZT4KPC9YM0Q+>
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