#povray fun continues:
It's the same as previously but:
1. Povray file is generated from #python script, that works on python objects;
2. Heightfield is not created in Gimp but generated from #numpy array.
3. I saved 10 seconds of my life by generating spheres using for loop.
The end goal is to re-create something that renders landscapes similar to: @wildflowersbot
I spent most of the day debugging coordinate issues (now I know that they were coordinate issues).
I managed to solve it only when I created a debug geometry attached below.
Basically highest spike is where camera **should** be, and red cylinder is where camera is placed.
When they mismatched I knew what was wrong.
Some more debugging.
I want to add some plants, and there are some blockers:
1) I'm a fuckin undirected perfectionst and got blocked by "modelling a curve of a blade of grass";
2) I need to see how much of the geometry I need to fill with grass objects, and I have no idea how much is that;
3) Python is **sloow** geometry with a million of objects took more time preparing pov file tan rendering.
Spent part of day tearing out color map code from color brewer and seaborn code, and then integrated it with the lanscape generators.
Below landscapes are done using divergent colormaps from color brewer. Will need to do something better next time.
Another entry about landscape generator.
Reworked some code, to allow me to easily randomize colors, without ugly hacks I used last time.
Choose another (still randomly/computer generated palette).
Results are better but still suck :/
Will need to read into color theory (maybe just globally allow much less dark colors?).
Or maybe the "grass" is just bad. Need to think.
Also python is starting to be the bottleneck :/ (generating 100k of objects and printing them to a file).
Good thing: it looks **better**, also I have improved performance (by doing the dumbest thing: using multiprocessing).
Bad thing is: povray files exploded from ~10mb to ~80mb.
Key was to use "ambient" property for "grass". Previously grass was darker that it should be as it was illuminated from the random direction. Now ambient lightning means that they are magically always illuminated.
 Here is the reference to the property: http://www.povray.org/documentation/3.7.0/r3_4.html#r3_4_6_3_1
Worked on performance, so I can add more grass (or in future more objects).
Here is the writeup of changes: https://blog.askesis.pl/post/2020/09/povraygen-diary-for-2020-09-04-and-03.html .
I'll work on something else than grass next :)
I have also somewhat widened (and randomized) the base of the blade of grass. I might revert that change though.
@jacek what do you mean, "results suck". These are amaze.
@rysiek Glad you like it!
@jacek is the code available somewhere?
@lioh for 3d rendering I use povray raycaster (which is free) I'll get around to open sourceing the python code that generates povray input files. I'll try to not forget to ping you once it is done.
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