CLI, along with several examples, plus model downloading

examples/scenes/ssl1300.toml

@@ -0,0 +1,19 @@
+# An SSL-1300 communications satellite (182k triangles) in geostationary orbit,
+# in an isometric view with Earth's limb behind it. Generated by
+# scripts/make-example-scenes.py; the model comes from scripts/fetch-models.sh.
+#
+#   resolved render --scene examples/scenes/ssl1300.toml --preview ssl1300.png
+
+sun = [144500446867, 38718778044, 0]
+moon = [0, 0, -3.844e8]
+
+[observer]
+position = [42164291.13, -34.20, 0.00]
+look_at = [42164000.00, 0.00, 0.00]
+up = [1, 0, 0]
+
+[[target]]
+model = "../models/nasa/ssl1300.glb"
+scale = 0.1
+position = [42163999.7300, 0.2428, 0.3631]
+attitude = [0.513066177, -0.706858772, -0.018726374, -0.486583084]