[x3d-public] MacOS: El Capitan breaks X3DOM volume rendering

[Vincent Marchetti]

I just discovered that volume rendering in X3DOM seems to break in the latest Mac system release:  "El Capitan"

Looking at the WebGL-based adaptation of X3D volume rendering, as demonstrated on the Vicomtech demo pages http://demos.vicomtech.org ; in particular the http://demos.vicomtech.org/medx3dom2015/volrenOpacityTest_body.xhtml example:

Here is that page as rendered in Safari, running under "El Capitan" a.k.a Mac OS 10.11.6



(Note: Not obvious in this screenshot, but one "slice" of the volume image faintly appears in the El Capitan rendering)



while in Safari, under "Yosemite" a.k.a. Mac OS 10.10.5





These screenshots were made with Safari browser, but Chrome and Firefox show same results in the two MacOS releases.

A request to members of the mailing lists:
If you are a Mac user and have upgraded to El Capitan, can you confirm these results (or even better, let me know that this was caused by a simple screwup or misconfiguration on my part!)

If you are familiar with how the volume rendering works in X3DOM, where would I even start in understanding how this can depend on OS release?

Thanks

Vincent Marchetti
vmarchetti at ameritech.net



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