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import numpy as np
import matplotlib.pyplot as plt
from string import Template
import pyopencl as cl
from pyopencl.cltypes import make_double3
mf = cl.mem_flags
from planets import earth
from sun import sun_direction
from datetime import datetime
fish_eye = True
config = {
'size_x': 1000 if fish_eye else 1920//4,
'size_y': 1000 if fish_eye else 1080//4,
'ray_samples' : 16,
'light_samples': 8,
'exposure': 4.0,
'zoom': 1.0, # only for pinhole view
'eye_pos': np.array([0, 0, 1.0001]),
'eye_dir': np.array([0, 1, 0]), # only for pinhole view
'date': (2020, 1, 20),
'latitude': 49.01,
'longitude': 8.4
}
time_range = (5, 20, 1)
cl_platform = cl.get_platforms()[0]
cl_context = cl.Context(properties=[(cl.context_properties.PLATFORM, cl_platform)])
cl_queue = cl.CommandQueue(cl_context)
cl_picture = cl.Buffer(cl_context, mf.WRITE_ONLY, size=config['size_x']*config['size_y']*3*np.float64(0).nbytes)
program = None
with open('raymarch.cl') as f:
program = cl.Program(cl_context, Template(f.read()).substitute(
{**config, **earth}
)).build()
for time in np.arange(*time_range):
pit = datetime(*config['date'], int(np.floor(time)), int((time-np.floor(time))*60), 0)
sun_dir = sun_direction(config['latitude'], config['longitude'], pit, 1.0)
sun = make_double3(
np.cos(sun_dir[0])*np.sin(sun_dir[1]),
np.cos(sun_dir[0])*np.cos(sun_dir[1]),
np.sin(sun_dir[0])
)
print(sun_dir)
(program.render_fisheye if fish_eye else program.render_pinhole)(
cl_queue, (config['size_x'], config['size_y']), None, cl_picture,
make_double3(*(config['eye_pos'] * earth['earth_radius'])),
make_double3(*(config['eye_dir'] * earth['earth_radius'])),
sun)
np_picture = np.ndarray(shape=(config['size_y'], config['size_x'], 3), dtype=np.float64)
cl.enqueue_copy(cl_queue, np_picture, cl_picture).wait();
plt.imsave("sky_%05.1f.png" % time, np_picture, origin='lower')
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