In this example, we optimize a tiny octree's output to the
RGB color vector [0, 1, 0.5], for a fixed ray.
We start with data format SH1 and in the middle switch to SH4 using the expand(format) function,
which automatically inserts extra channels as appropriate.
Then we continue to optimize using a manual gradient descent with MSE.
Slowly, the results get closer to the target vector.
.. literalinclude:: ex_opt_toy.py
:language: python
The output:
GRADIENT DESC [0.88920575 0.88920575 0.88920575] [0.67369866 0.6859846 0.67984015] [0.6194525 0.65586865 0.63762873] [0.58019906 0.64437073 0.61214054] [0.5475207 0.6409838 0.59386927] [0.5188446 0.6420485 0.579674 ] [0.49309036 0.64582 0.5681365 ] [0.46970066 0.6513118 0.55849427] [0.4483344 0.657904 0.5502867] [0.42875046 0.66518104 0.54321104] Expanding.. SH4 [0.4107593 0.6728529 0.5370555] [0.3631369 0.71049845 0.5277597 ] [0.32639033 0.7405325 0.52003586] [0.29751268 0.7646569 0.51378375] [0.27432522 0.7842779 0.5088086 ] [0.25531954 0.80046684 0.50490075] [0.23945224 0.8140159 0.50186735] [0.22599061 0.8255081 0.4995423 ] [0.21440998 0.83537465 0.4977861 ] [0.2043267 0.84393847 0.49648416] TARGET [0. 1. 0.5]