Basic sky rendering using the model by Nishita et al.

See "Display of the earth taking into account atmospheric scattering" (Nishita et al., 1993)

`bluedot.py` renders the full earth disk while rotating the sun around it.

`sunrise.py` renders the rise of the sun.

Physical model constants may be changed in `planets.py`.

1 files changed, 10 insertions, 0 deletions

diff --git a/planets.py b/planets.py
new file mode 100644
index 0000000..f94782c
--- /dev/null
+++ b/planets.py
@@ -0,0 +1,10 @@
+earth = {
+    'earth_radius': 6371e3,
+    'atmos_height': 100e3,
+
+    'rayleigh_atmos_height': 7994,
+    'mie_atmos_height'     : 1200,
+
+    'rayleigh_beta': (3.8e-6, 13.5e-6, 33.1e-6),
+    'mie_beta'     : (21e-6)
+}