CLI, along with several examples, plus model downloading

examples/scenes/boxwing.toml

@@ -0,0 +1,29 @@
+# A box-wing satellite 7000 km from Earth's center (about 620 km up), seen from 60 m
+# with Earth's limb behind it.
+#
+# The camera looks 63.7 degrees from straight down. At this altitude the limb is
+# 65.7 degrees from straight down, so it crosses the image about 2 degrees (320 px)
+# above the center, with Earth below and space above. Image up is the local vertical.
+#
+# The satellite is turned so the camera sees it along its (+1, +1, +1) body diagonal,
+# an isometric view of the +X (array side), +Y and +Z faces, with +Z toward image up.
+# The Sun is placed to light those three faces and the Earth near the limb.
+#
+#   resolved render --scene examples/scenes/boxwing.toml --preview boxwing.png
+
+sun = [111155951345, -100085268138, 2610842842]
+moon = [0, 0, -3.844e8]
+
+# Anything left out keeps the example camera's value.
+[camera]
+exposure = 1e-4
+
+[observer]
+position = [7000026.62, -53.77, 0.0]
+look_at = [7000000.0, 0.0, 0.0]
+up = [1, 0, 0]
+
+[[target]]
+model = "../models/boxwing.gltf"
+position = [7000000.0, 0.0, 0.0]
+attitude = [0.218913627, -0.630230282, 0.320639661, -0.672366584]