CLI, along with several examples, plus model downloading

examples/scenes/ostm.toml

@@ -0,0 +1,19 @@
+# OSTM / Jason-2 (65k triangles) in its 1336 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/ostm.toml --preview ostm.png
+
+sun = [125463331183, -81476839938, 0]
+moon = [0, 0, -3.844e8]
+
+[observer]
+position = [7714190.15, -72.55, 0.00]
+look_at = [7714137.00, 0.00, 0.00]
+up = [1, 0, 0]
+
+[[target]]
+model = "../models/nasa/ostm.glb"
+scale = 3.5
+position = [7714137.0021, -0.1237, -0.1237]
+attitude = [0.276078628, -0.655532500, 0.265098361, -0.650984325]