add more screenshots and fix some spelling and grammar

apps/astro/src/content/projects/habitat.md

@@ -14,8 +14,25 @@ description: A vignette of an O'Neill orbital habitat using @hello-worlds/react
 
 # Habitat
 
-Habitat is an experiment to validate non-standard world topologies that come standard with the @hello-worlds library. It's inspired by scifi, especially the Cycler habitats featured in Kim Stanley Robinson's book _2313_, or O'Neill habitats featured in other works.
+Habitat is an experiment to validate one of the non-standard world topologies that come standard with the @hello-worlds library. It's inspired by scifi, especially the Cycler habitats featured in Kim Stanley Robinson's book [_2313_](https://www.goodreads.com/book/show/11830394-2312), or O'Neill habitats featured in other works.
 
-Making a world wrap around itself was the primary motivator behind the hello-worlds library. I wanted to make a game settings based inside a Hollow-Earth, basically an inverted sphere planet (such as featured in the opening intro to the _Game of Thrones_ tv show). I've had som success with that, but I got distracted by beautiful non-real-time renders of O'Neill habitats, and decided to create a "vignette" of what it might look like to have a real-time rendered virtual world inside such as setting.
+Making a world wrap around itself was the primary motivator behind the hello-worlds library. I wanted to make a game setting based inside a Hollow-Earth, basically an inverted-sphere planet (such as featured in the opening intro to the _Game of Thrones_ tv show). I've had some success with that, but I got distracted by beautiful non-real-time renders of O'Neill habitats, and decided to create a "vignette" of what it might look like to have a real-time rendered virtual world inside such as setting. After all, it should be much easier to create a virtual world when it's small and can be rolled-up, right???
 
-Some considerations and bespoke solutions inside this project include (in various states of done-ness) a volumetric atmosphere solution which considers the shape of a cylinder, a cylinder-based camera solution, and an interesting down/upsampling pipeline to optimize performance of the ray-marched volumetric atmosphere.
+Well, nope.
+
+Some considerations and bespoke solutions inside this project include (in various states of done-ness) a volumetric atmosphere solution which considers the shape of a cylinder (atmosphere gets thinner towards the cylinder-center-line), a cylinder-based camera solution (you always point outwards), and an interesting down/upsampling pipeline to optimize performance of the ray-marched volumetric atmosphere (not related to the cylinder, but nevertheless awesome).
+
+Some other thoughts about cylinder worlds à la O'Neill cylinders:
+
+They wrap nicely along one axis, so you can use tiling terrains, especially as you can easily have land areas which are squares (which would not be true of Halo-type ring wolds, for example):
+<img class="h-256 object-scale-down" src="/large-terrain.png" alt="A tiled terrain heightmap I prepared" />
+
+Here's some more photos, I think it's a pretty project so far :)
+
+A look at what realistic tiled heightmaps can get you:
+
+<img class="h-256 object-scale-down" src="/habitat-screenshot-2.png" alt="A look at what realistic tiled heightmaps can get you " />
+
+A look through the downsampled atmosphere shader:
+
+<img class="h-256 object-scale-down" src="/habitat-screenshot-1.png" alt="A look through the downsampled atmosphere shader" />