Replying to
@rc2014@oldbytes.space @concretedog@mastodon.social
This seems to be license based: they taken all my BSD/MIT code but not LGPL.
Remote
kwahoo
@kwahoo@101010.pl
mastodon 4.8.0-alpha.3github.com/kwahoo2
FreeCAD, VR
16 Followers
19 Following
19 Posts
Joined February 16, 2025
[EN] @MonadoXR@floss.social with libsurvive tracking works well now even with two Lighthouse setup.
@FreeCAD@fosstodon.org XR workbench does not need SteamVR at all now for Lighthouse-based devices.
Other news: the workbench now allows to creation of Draft polylines, including filled faces and point snapping.
#FreeCAD #XR #FreeCADFriday
[PL] Monado ze śledzeniem libsurvive działa teraz dobrze nawet przy konfiguracji z dwoma Lighthouse.
@FreeCAD@fosstodon.org XR workbench nie potrzebuje już SteamVR dla urządzeń opartych na Lighthouse.
Inne nowości: Workbench umożliwia teraz tworzenie polilinii Draft, w tym wypełnionych powierzchni i przyciągania punktów.
A portal to another dimension at home... Tilt Five AR glasses displaying our favourite #FreeCAD building on a photo-reflective surface hanging on a wall.
@FreeCAD@fosstodon.org Virtual Reality addon just works with Tilt Five AR glasses and the latest beta runtime(1.5). Pretty cool, knowing that T5 does not obstruct real world view.
Tip: you can pair two T5 wands with single glasses to get full left/right hand controller scheme.
Replying to
@FreeCAD
Nice! Hopefully, the recording will be uploaded there https://video.fosdem.org/2026/h1309/
...and another attempt to Free Flight tool for @FreeCAD@fosstodon.org (navigate with keyboard and mouse like in a FPS game). Since I failed to deliver equal experience on all platforms using just Qt, this time I'm experimenting with SDL library provided by pySDL3 python bindings. More info: https://github.com/FreeCAD/FreeCAD/issues/5563#issuecomment-3192561148
Replying to
PS Small tool for people who would like to test the Addon without owning a VR set (on Linux) https://101010.pl/@kwahoo/115103034576189423
Quoting
Testing/developing #FreeCAD XR workbench without VR hardware should be easier now.
I created https://github.com/kwahoo2/remote-mndset This is a client for @MonadoXR@floss.social remote driver. The client supports both keyboard/mouse or gamepad input.
Of course, remote-mndset can be used with any OpenXR application, as long as the Monado runtime is used.
I am currently working on modelling tools in FreeCAD XR Workbench. That includes:
- working plane that can be aligned to object's face normal
- drawing wires (polylines) for face creation
- making pads and pockets from these faces
Teaser below:
Replying to
@TechConnectify
Ok, after digging a bit I see your point about underlying chemistry.
Definitely lambda ratio oscillations have an impact on a catalyst converter efficiency https://www.sciencedirect.com/science/article/pii/S0926337323013000
Both amplitude and frequency matters. This also explains why the frequency is similar in all engines.
And the frequency is quite low, much lower than lambda sensor and ECU would theoretically allow - this indicates that ECU deliberately acts this way. Even with two state sensor we can call this a proactive action.
The downside of the two state sensor is that, the lambda ratio can drift during low or high signal state period.
As for the graph, it should have a disclaimer like "for average lambda in X period of time".
I've learned something new here;)
@TechConnectify
Superb vid!
But I have an issue with the claim at 24:28, that three way catalyst converter cannot work at lambda equal exactly zero.
Below is graph of three way catalyst converter efficiency. Solid lines are for harmful exhaust components after the catalyst converter (dashed - before). Hatched region is "catalyst converter high efficiency region". As you can see at lambda=1 CO, HC and NOx are all low.
But the 2 state lambda sensor is, well, 2 state. It cannot show when you are at lambda=1.
Even wideband lambda sensor is nothing more than 2 state sensor with an oxygen pump added. And you are using current to pump in or pump out oxygen from a some "semi-closed" volume in the sensor until the state changes. This might be a reason for small oscillations even with a wideband sensor.
Source of the graph "Podstawy budowy silników - Sławomir Luft"
Testing/developing #FreeCAD XR workbench without VR hardware should be easier now.
I created https://github.com/kwahoo2/remote-mndset This is a client for @MonadoXR@floss.social remote driver. The client supports both keyboard/mouse or gamepad input.
Of course, remote-mndset can be used with any OpenXR application, as long as the Monado runtime is used.
Picking objects with 3D ray demo.
Shows an example use of FreeCADGui.ActiveDocument.ActiveView.getObjectInfoRay(vec_start, vec_dir) introduced in FreeCAD 1.1
More info: https://forum.freecad.org/viewtopic.php?t=98958
https://gist.github.com/kwahoo2/6be97fd804ab3df0441eb0e710eafbd9#file-robo-waypoints-ray-pick-py
Replying to
@TechConnectify
Yes, the ECU causes it, but only because the way the lambda sensor works.
The algorithm is simple: if lambda is below 1 (rich) decrease fuel amount till lambda passes 1 (lean). Then start increasing fuel till lambda goes under 1 again.
ECU cannot command "stay at lambda 1", since the sensor cannot measure that value and there is no valid feedback.
#FreeCAD XR Workbench can run now on Wayland thanks to the EGL interface.
Works with #SteamVR and @MonadoXR@floss.social or any runtime that supports XR_MNDX_egl_enable extension.
Note: this is an early work amd requires an pyopenxr fork and Coin3D compiled with EGL instead of GLX (info: https://github.com/kwahoo2/freecad-xr-workbench/blob/main/doc/EGL_Howto.md)
[EN] Making an egg shape with Sketcher and Descartes method in @FreeCAD@fosstodon.org
Based on https://www.ijpam.eu/contents/2012-78-5/8/8.pdf
[PL] Tworzenie kształtu jajka w szkicowniku metodą Descantesa
QR codes have enough capacity to store small @freecad@social.freecad.org scripts/models. This is the makeBottleTut example from https://wiki.freecad.org/Topological_data_scripting#The_script 547 bytes after compression.
The script opens makeBottle.png unzips the text from the QR code and executes it.
Scripts:
https://gist.github.com/kwahoo2/38560d14c913fdf83fa9737b71fd18f5
