CLI, along with several examples, plus model downloading

examples/scenes/landsat8.toml

@@ -0,0 +1,19 @@
+# Landsat 8 (85k triangles) in its 705 km 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/landsat8.toml --preview landsat8.png
+
+sun = [111172883513, -100100513931, 0]
+moon = [0, 0, -3.844e8]
+
+[observer]
+position = [7083216.12, -150.19, 0.00]
+look_at = [7083137.00, 0.00, 0.00]
+up = [1, 0, 0]
+
+[[target]]
+model = "../models/nasa/landsat8.glb"
+scale = 1.0
+position = [7083133.0811, -2.1094, -2.6020]
+attitude = [0.227385402, -0.634228406, 0.312656887, -0.669549012]