demo outputs black/blank images

[devonbalicki]

when i use the demo at https://www.clicktorelease.com/code/conway3d_ccapture/# (recording for a full 4 seconds) the frames exported are all blank or black, and the video exported is entirely black if i use webm

0000008.png

0000008.jpg

similar results for using webm, video is all black. Only WebM (MediaRecorder) WIP seems to output the expected result.

tried using the index.html from the repo locally and got the same results.

[devonbalicki]

just noticed this is happening in chrome, but not firefox

[chrisgervang]

I've seen this too.

[xasopheno]

Also having this problem recording a 3js canvas.