@lisyarus Under "Quaternions in Clifford (aka geometric) algebra" near the end, there's a problem with your definition of i, j, and k. Notice that ij ≠ k, but instead ij = −k, so these are not actually isomorphic to the quaternions. You need to negate all three bivectors so that i = −e₂₃, j = −e₃₁, and k = −e₁₂.

@lisyarus There's also a typo in the "Quaternions in Clifford (aka geometric) algebra" section where you accidentally say e₁e₃ = −e₃e₂. There's another typo in the first line of the "Dot product via conjugation" section where the closing parenthesis is missing for (w,x,y,z).

@lisyarus I am not a statistically significant sample, but I really enjoyed this! 😃

It is (obviously) the kind of topic one could write a book on, so in a blog post choices need to be made on what to include and what to skip. But overall it feels like a nice stepping stone for anyone who would like to learn about quaternions!

Here's the fix, btw. `td` is the duration between two input keyframes.

@lisyarus To date this has been the easiest to understand explanation of quaternions that I've come across: https://youtu.be/en2QcehKJd8

Unfortunately it is an hour long video of a powerpoint presentation so referring back to it is a pain. A text form article that takes notes from this would be amazing to have!

@lisyarus I *still* don't really understand them tbh so I'm always interested in more explanations.

@lisyarus yes

@lisyarus nice! Just sarcasm.

@lisyarus seems really cool! I'm playing it and I explored the 1st floor/map multiple times, and it seems that I'm in an unwinnable situation, soft locked, as there's nowhere else to go.

@lisyarus cool. I've got to level 3 so far. Kinda expected grenades to destroy furniture, which blocks corridors and doorways, but oh well, indestructible martian furniture.

Apparently the game also runs on Steam Deck! That's so cool, since I've only tested it on Windows & Linux PC. I guess my Linux packaging skills are enough for that :)

@lisyarus What is the best way to send feedback?

I wish the districts didn't build themselves during _pause_ – I want to be able to try out different road designs without districts forcing me into the layout on the first try.

@lisyarus congratulations on the demo. 🥳

I'm looking forward to the full release.

@lisyarus Thank you for this "Missing Manual". I haven't yet had to get down'n'dirty with glTF (beyond feeding static models/attribs to a shader) so this should serve well as a handy resource [or possibly a grave warning]. 😄

@lisyarus Good article. Some bits was a lil hard to follow, but its mostly because I'm trying translate your descriptions of things to how I've built things. Like using Local CS in many places felt confusing because I've been calling these things world, model & local spaces for years now when dealing with skinning transform hierarchies.

And the GLTF stuff, woof, how much I hate their bindpose implementation. I stick to using the localspace node transforms instead of bindpose matrices.

@lisyarus https://github.com/sketchpunklabs/ossos/blob/ossos_next/prototypes/_lib/customSkinning/MatrixSkinMaterial.js#L59

Here's an alternative example of doing matrix skinning in glsl. This way you can remove the loop in your shader & get the final model space transform for the bone that you can apply to the pos & normal, instead of computing it twice.

In that folder I also have Pure DualQuat, Transform > DQ+Scale and SQT skinning alternatives.

@jonikorpi I mentioned you in the video because your terrain was a direct inspiration for me, hope it's OK :)

@lisyarus Well done you've invented spaceship QWOP 😅​

@lisyarus yes that ?s=20 always made (and makes) me irrationally angry

@lisyarus Cities Skylines should be ashamed of not looking this good

@lisyarus I love this kind of simple but elegant aesthetic in games. Keep us posted.

@lisyarus Looks like they're waiting for clearance to take off.