The current thumbnail of Orientation / Fabian Iwand | Observable contains a snapshot of the notebook, with part of a WebGL canvas (600x600) visible. During my edits I noticed that occasionally the canvas would be detected and directly used as thumbnail. I’m guessing this is some timing issue that d…

I did some more tests, yielding an image with a tracking URL as src that contained the time since load: The first time I delayed each yield by 1000ms and observed a timeout of around 3s. The second time I decreased the delay to 500ms and noticed a timeout of >30s in my logs. Looks like the fetch …

The thumbnail daemon tries to wait until the page has loaded and is idle, yes. WebGL is unfortunately somewhat unreliable on our current headless Chrome renderer. We’d like to overhaul our process for generating screenshots with something that is both more reliable, offers higher fidelity, and allo…

It sounds like you already have a strategy laid out. I’d love to learn more about your approach - can you share some details?

. @mbostock as you are looking to retrofit this notebook preview feature, might I suggest you allow notebook devs to plop gifs of their works for preview? P.S.: posted it here for the ruckus rumble :slight_smile: [image] dataPixy 🧚♂️ I 🗺️ & 📈 🈸 📓🕵️ (TarasNovak) .@observablehq let's put …

on a related note: is there a runtime notebook API we could use to create a grid view of a collection of notebook thumbnails in notebooks that just have links to other notebooks on some subject until Collections feature is available for everyone? All I am looking for is given a notebook url, get no…

so, I’ve updated my Chicago Crimes series notebook: [image] Chicago Crimes EDA An Observable notebook by Taras Novak. would love to find a better way to present that list with thumbnails via some notebook or observablehq api if possible.

and now I think your thumbnail daemon just died completely. could it be a sign from above to rework it? [blank--observablehq-thumbnails]

There was a bug preventing the thumbnail daemon from taking screenshots earlier today, but we fixed it and worked through the backlog, so your thumbnails should be back again. Sorry about that!

. @mbostock thanks for the quick fix! should I log this notebook thumbnail api feature request separately, so you can close this one? [image] Thumbnail daemon fails to detect WebGL canvas Site Feedback on a related note: is there a runtime notebook API we could use to cre…

found the solution to what I wanted to do for my master notebook and getting notebooks info in @Fil ’s post here: [image] Export final code? Community Help @jrus looks like it is here curl https://api.observablehq.com/document/@jrus/halton | jq . see my observablehq …

Thumbnail daemon fails to detect WebGL canvas

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RandomFractals September 5, 2018, 9:55pm 12

loopback!

would be cool if your thumbnailer process in this forum could take ‘deep links’ into account and snap the part of the doc, graph, or diagram linked to…

see this post for refs:

Topic		Replies	Views
Blank thumbnails	27	3206	May 31, 2019
Feature request: Supply a fixed thumbnail Feedback	12	2061	October 12, 2018
fetch a notebook info/thumbnail Community Help	4	801	April 14, 2021
webGL2 in the thumbnail images ?	1	646	October 22, 2018
thumbnails going back to code =(	3	566	April 13, 2019

Thumbnail daemon fails to detect WebGL canvas

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