Lots of updates and bug fixes.  See the release notes and/or LOG for details.
The attached tarball, csv9.5.4.tar.gz, contains the source code for this release along with the source code for the sub...

I present the easiest way to understand curved spaces, in both hyperbolic and spherical geometries.  This is the first in a series about the development of Hyperbolica.

Chapters:
0:00 Intro
0:24 Spherical Geometry
2:33 Hyperbolic Introduction
3:53 Projections
5:37 Non-Euclidean Weirdness
8:31 Non-Euclidean Formulas
10:20 Outro

Hyperbolica
Trailer: https://www.youtube.com/watch?v=EMKLeS-Uq_8
Steam Page: https://store.steampowered.com/app/1256230/Hyperbolica/

Henry Segerman
https://www.youtube.com/channel/UC4zzTEL5tuIgGMvzjk1Ozbg
https://www.youtube.com/watch?v=eGEQ_UuQtYs

HyperRogue
https://roguetemple.com/z/hyper/

Music:
"Glass Waves" By Phil K
https://willcomposeforfood.com/

We build our 4D world using Tetrahedral (instead of Triangular) Meshes, and show 4D Crystals as an example.

See also: How to walk through walls using the 4th Dimension: https://www.youtube.com/watch?v=9yW--eQaA2I

Stay tuned for the next video, which will show more gameplay! We also will make more videos explaining the fourth dimension using the game. Subscribe to the channel if you are interested.

Image Formation by Lenses from College Physics. Download for free at http://cnx.org