camera_options={}, geometry_options={},

sampling_options={}, results_options={},

remove=[], comment=None, verbose=False,

overwrite=False):

"""

refer to wikispace.librat.com for full definitions

INPUT

-----

fname: path to save camera file

results: default None, str

If this is None then a random name is generated, otherwise

str is used.

remove: default [], list

list of commands as strings in the librat format that

are to be not included in the camera file

comment: default None, str

a comment to inlcude at the beigging of the camera file

e.g. associtated light file etc.

"""

if os.path.isfile(fname) and not overwrite:

R = raw_input('this camera exists, overwrite? (y/n)').lower()

if R != 'y':

sys.exit()

camera = OrderedDict()

camera['camera.name'] = 'simple camera'

for K, V in camera_options.items():

camera[K] = V

geometry = OrderedDict()

geometry['geometry.perspective'] = True

geometry['geometry.azimuth'] = 0.0

geometry['geometry.zenith'] = 0.0

geometry['geometry.twist'] = 0.0

geometry['geometry.lookAt'] = [0, 0, 0]

geometry['geometry.idealArea'] = 2

geometry['geometry.boomLength'] = 10.

for K, V in geometry_options.items():

geometry[K] = V

sampling = OrderedDict()

sampling['samplingCharacteristics.nPixels'] = 262144

sampling['samplingCharacteristics.rpp'] = 4

for K, V in sampling_options.items():

sampling[K] = V

### setting results

if 'oname' in results_options.keys():

oname = results_options['oname']

else:

oname = '-'.join(camera['camera.name'].split()) + '_' + datetime.datetime.now().strftime("%y-%m-%d_%H:%M:%S")

results = OrderedDict()

results['result.integral.mode'] = 'scattering order'

results['result.integral.format'] = 'ascii'

results['result.image'] = oname + '.hips'

results['result.integral'] = oname + '.results'

### concatenate settings

camera_settings = OrderedDict(camera.items() +

geometry.items() +

sampling.items() +

results.items())

for drop in remove:

del camera_settings[drop]

write_camera(fname, camera_settings, comment, verbose)

comment=None, verbose=False,

overwrite=False, remove=[]):

if os.path.isfile(fname) and not overwrite:

R = raw_input('this camera exists, overwrite? (y/n)').lower()

if R != 'y':

sys.exit()

camera = OrderedDict()

camera['camera.name'] = 'simple camera'

for K, V in camera_options.items():

camera[K] = V

geometry = OrderedDict()

geometry['geometry.azimuth'] = 0.0

geometry['geometry.zenith'] = 0.0

for K, V in geometry_options.items():

geometry[K] = V

### concatenate settings

camera_settings = OrderedDict(camera.items() +

geometry.items())

for drop in remove:

del camera_settings[drop]

new_options={}, comment=None, verbose=False,

remove=[]):

with open(old_camera) as cam:

camera_settings = OrderedDict()

for line in cam.readlines():

if '#' in line or '{' in line or '}' in line or len(line) < 10:

continue

else:

var, val = line.strip().strip(';').split('=')

try: val = float(val)

except: pass

if isinstance(val, str):

val = val.replace('"', '')

val = val.replace('"', '')

val = ' '.join(val.split())

if isinstance(val, str) and len(val.split(',')) > 1:

val = [float(v) for v in val.split(',')]

camera_settings[var.strip()] = val

for K, V in new_options.items():

camera_settings[K] = V

if oname:

camera_settings['result.image'] = oname + '.hips'

camera_settings['result.integral'] = oname + '.dat'

for drop in remove:

del camera_settings[drop]

with open(fname, 'w') as cam:

cam.write('camera {\n')

cam.write('\n')

cam.write('# camera location: {}\n'.format(fname))

cam.write('# created by: {}\n'.format(getpass.getuser()))

if comment is not None:

for line in range((len(comment) // 75) + 1):

cam.write('# ' + comment[line * 75: (line + 1) * 75] + '\n')

cam.write('\n')

for K, V in camera_settings.items():

if isinstance(V, list):

V = ','.join([str(v) for v in V])

elif isinstance(V, str):

V = '"{}"'.format(V)

elif isinstance(V, bool):

V = '{}'.format({True:'TRUE', False:'FALSE'}[V])

cam.write('{} = {};\n'.format(K, V))

if verbose: print '{} = {};\n'.format(K, V).strip()