Added earth surface texture

examples/scenes/icesat2.toml

@@ -3,15 +3,22 @@
 # scripts/make-example-scenes.py; the model comes from scripts/fetch-models.sh.
 #
 #   resolved render --scene examples/scenes/icesat2.toml --preview icesat2.png
+#   resolved render --scene examples/scenes/icesat2.toml --lighting L1 --preview icesat2.png
 
-sun = [105781668823, -105781668823, 0]
+sun = [143802702898, -41234761516, 0]
 moon = [0, 0, -3.844e8]
+# Earth-fixed to inertial: 25 N 33 E behind the spacecraft, looking north.
+earth_attitude = [0.655810260, -0.694017033, -0.135426580, -0.264410481]
 
 [observer]
 position = [6874182.69, -103.11, 0.00]
 look_at = [6874137.00, 0.00, 0.00]
 up = [1, 0, 0]
 
+# At lighting L1, Earth's surface shows July (from scripts/fetch-earth.sh).
+[appearance]
+earth_month = 7
+
 [[target]]
 model = "../models/nasa/icesat2.glb"
 scale = 1.0