Replies: 1 comment · 6 replies
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Hi thanks for posting. How big are your datasets? If it fits into GPU RAM the easiest thing is to just have everything on the GPU, I guess unlike many plotting libraries wgpu can actually handle this, for example: pygfx/pygfx#819 If they are too large to fit into RAM we can guide you to some creative solutions based on what exactly you're trying to visualize. |
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Nice! For an orthographic projection like this you could determine the currently viewable extent of the scene similar to how axes ranges are set dynamically: https://github.com/fastplotlib/fastplotlib/blob/main/fastplotlib%2Fgraphics%2F_axes.py#L401 Zoom isn't a reliable way to do it I think. Once you have the extent, you could use different subsample levels for a few different scales of extent ranges. This would be some kind of basic LOD system I think. @almarklein might have a better idea. Would need more thought to extend this to perspective projections. |
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I think with this kind of data we assume an orthographic projection (i.e. fov==0).
The The current "zoom level" of the camera is defined by its |
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Super-cool use-case BTW 🤘 |
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I ended up essentially replicating the Clikchouse demo. The SQL from the demo outputs an image as a result, so it is very easy to render using fastplotlib, and it creates some nice-looking graphs:
I also turned it into an animation, using the Simple Image Update example, and made a post on it here (trying to promote fastplotlib a bit🙂). |
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The animation function will render continuously which will have a performance impact by constantly updating the buffer, unless you put in condition to update only when there's significant changes in the current extent. If you post your animation function I can take a look. Cool post, thanks for sharing! 😄 |
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Hi,
First of all, what an excellent library! I have been looking for something like this for a long time.
I'm looking into the possibility of hot-loading new data (in my case, from Clikchouse) when zooming in on the data. Clickhouse supports various output formats like Arrow Stream (https://clickhouse.com/blog/streaming-real-time-visualizations-clickhouse-apache-arrow-perpsective) that might be useful. Essentially, I want to do something similar to this Clickhouse demo:
https://adsb.exposed/?dataset=Planes&zoom=2&lat=18.1504&lng=88.5938&query=11aea631085a55a6bc0f9b574d7b6c16
Any ideas, pointers to or examples on how this could be done?
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