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-rw-r--r--fancy_local_sunrise.py90
1 files changed, 90 insertions, 0 deletions
diff --git a/fancy_local_sunrise.py b/fancy_local_sunrise.py
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+++ b/fancy_local_sunrise.py
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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
+
+config = {
+ 'size_x': 1000,
+ 'size_y': 1000,
+
+ 'ray_samples' : 16,
+ 'light_samples': 8,
+
+ 'exposure': 2.0,
+ '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),
+ 'timezone': 1, # GMT+1
+ 'summertime': False,
+
+ 'latitude': 49.01356,
+ 'longitude': 8.40444
+}
+
+time_range = (6, 20, 0.5)
+
+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, config['timezone'], 1.0 if config['summertime'] else 0.0)
+
+ 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(
+ 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();
+
+ fig = plt.gcf()
+
+ ax_image = fig.add_axes([0.0, 0.0, 1.0, 1.0], label='Sky')
+ ax_image.imshow(np_picture, origin='lower')
+ ax_image.axis('off')
+
+ ax_polar = fig.add_axes([0.0, 0.0, 1.0, 1.0], projection='polar', label='Overlay')
+ ax_polar.patch.set_alpha(0)
+ ax_polar.set_theta_zero_location('N')
+ ax_polar.set_rlim(bottom=90, top=0)
+ yticks = [0, 15, 30, 45, 60, 75, 90]
+ ax_polar.set_yticks(yticks)
+ ax_polar.set_yticklabels(['' if i == 90 else '%d°' % i for i in yticks], color='white', fontsize=6)
+ ax_polar.set_rlabel_position(-90/4)
+ ax_polar.set_xticklabels(['N', 'NW', 'W', 'SW', 'S', 'SE', 'E', 'NE'])
+ ax_polar.grid(True)
+
+ plt.savefig("sky_%05.1f.png" % time, bbox_inches='tight', pad_inches=0.2)
+
+ fig.clear()
+