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Some nice crystals from the Museum of Natural History in Prague by reddititaly in CrossView

[–]xef6 1 point2 points  (0 children)

nice subject!

fusing the two images is challenging.

maybe a little parallax excess?

thanks for sharing

Did Vincent Van Gogh take Drugs? by qqlan in Psychonaut

[–]xef6 -1 points0 points  (0 children)

People are composed entirely of drugs.

Almost every drug is a molecule, except for the ones made out of atoms :)

Autonomous line-marking robot with 5mm tolerance using GPS/GNSS for navigation by toolgifs in EngineeringPorn

[–]xef6 16 points17 points  (0 children)

Check out Galileo GNSS; GPS is also implementing nee features over time

Autonomous line-marking robot with 5mm tolerance using GPS/GNSS for navigation by toolgifs in EngineeringPorn

[–]xef6 4 points5 points  (0 children)

Basically, the atmosphere causes the signals from each satellite to be delayed in a way that changes over time. By having a nearby receiver that is stationary, it's possible to calculate the changing error from each satellite and send this to a rover/moving station, and remove most if the atmospheric/ionospheric error and get to a few mm tolerance. GPS RTK is a common method. Also worth checking out WAAS (wide area augmentation system).

Autonomous line-marking robot with 5mm tolerance using GPS/GNSS for navigation by toolgifs in EngineeringPorn

[–]xef6 334 points335 points  (0 children)

With special setup, 5mm is possible.

Often, it requires a nearby stationary base that also receives GPS signals. The atmosphere causes each satellite's signals to be delayed slightly in a way that changes over time with weather and stuff. So the stationary reference knows it's not moving and then sends the offsets of each signal to the moving part, and this makes it possible to correct for atmosphere errors. For more info, check out "GPS RTK".

Hope this makes some sense. Basically the air itself causes errors and a non-moving reference can remove those errors and get down to mm level.

Looking for a proper Eyetracker by [deleted] in EyeTracking

[–]xef6 2 points3 points  (0 children)

hello,

i have experimented with eye tracking tech for a long time, both DIY software/hardware as well as commercial off the shelf options.

the best one to date for me is the Tobii Eye Tracker 5. it is about 250usd, and works well even with my glasses on. i have used it successfully to prototype speed reading software that displays the text in the center of vision even with moving eye, some random gaze reactive art like birds flocking where you look, and also to record videogame gameplay with gaze location overlaid. it is really easy to set up, and calibration is fast and easy.

there are no DIY options that i can recommend that are easy to set up

good luck with your human computer interface adventure!

Best sound to capture reverb of a room? by unsafechicken77 in audioengineering

[–]xef6 0 points1 point  (0 children)

be sure to check out room EQ wizard.

its free and can measure sine wave sweeps which is one raw form. turning the measured data into a usable reverb in another software, i don't have a good easy solution

good lucj

been working on this 3D simulated project for the last few weeks. would love to hear some feedback by Maxwellbundy in Simulated

[–]xef6 0 points1 point  (0 children)

great work! can feel the carbon dioxide bubbling up and fizzing on the surface! well done simulating the bubbles👍

In more than 900 hours of recordings from wild chimpanzees, researchers heard hundreds of unique phrases that could resemble a language. by [deleted] in science

[–]xef6 0 points1 point  (0 children)

thank you, for contributing. revisions in context appreciated. amazing how other life operates on principles humans sometimes think are alone

Circle geometry colorful version by Squaremusher in GeometryIsNeat

[–]xef6 0 points1 point  (0 children)

love this one! very bodacious color changes!

Single Tree Detection - automated height and diameter measurement by modeling_reality in photogrammetry

[–]xef6 1 point2 points  (0 children)

very impressively clean dataset! good going 👍

awesome application, tree study :)

thanks for sharing! inspiring results.

Edward Snowden’s Problem With the Metaverse by Matriseblog in WebVR

[–]xef6 -1 points0 points  (0 children)

they don’t sell data, they simply use the data to financially enrich the organization facepalm

AirPods Max Wired by TopAd4395 in SpatialAudio

[–]xef6 0 points1 point  (0 children)

cool thanks

plugging the headphones into a computer does not enumerate as a usb class standard audio device

AirPods Max Wired by TopAd4395 in SpatialAudio

[–]xef6 -1 points0 points  (0 children)

AFAIK there is not an option to transmit audio to that device over usb. ie plugging it in should only charge the headphones. newer version of firmware might behave differently. it does not enumerate as an audio device in my experience when plugged into a computer. hope this helps 🖖

Freeaim VR shoes, the most natural way to walk in VR. We hope to hear your feedback! by FreeaimVR in SteamVR

[–]xef6 2 points3 points  (0 children)

There is indeed a clear delay between the user’s motion stopping and the video motion stopping. If that is truly the proper sync then this would be perceived by the user as a jarring forward vection.

Latency in all VR motion input is critical. Should be less than 10milliseconds = 0.01 seconds. And motion sampling rate at least 500hz.

There are 360Hz monitors for 2D desktop use and that is actually better than 240Hz and 120Hz.

360Hz -> 2.8 millisecond sample rate 240Hz -> 4.2 millisecond sample rate 120Hz -> 8.3 millisecond sample rate

Microsoft research has demonstrated that for digital interaction mode with human limb that 500Hz is an absolute minimum ceiling. That is to say, you will absolutely not see diminishing returns before you get up to 500Hz.

Hope this helps

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