yt.visualization.volume_rendering.camera_path module

class yt.visualization.volume_rendering.camera_path.Keyframes(x, y, z=None, north_vectors=None, up_vectors=None, times=None, niter=50000, init_temp=10.0, alpha=0.999, fixed_start=False)

Bases: object

all_pairs()

Generates all (i,j) pairs for (i,j) for 0-size

cartesian_matrix()

Create a distance matrix for the city coords that uses straight line distance

cooling()

create_path(npoints, path_time=None, tension=0.5, shortest_path=False)

Create a interpolated camera path from keyframes.

Parameters:

• npoints (integer) – Number of points to interpolate from keyframes

• path_time (array_like, optional) – Times of interpolated points. Default: Linearly spaced

• tension (float, optional) – Controls how sharp of a curve the spline takes. A higher tension allows for more sharp turns. Default: 0.5

• shortest_path (boolean, optional) – If true, estimate the shortest path between the keyframes. Default: False

Returns:

path – Dictionary (time, position, north_vectors, up_vectors) of camera path. Also saved to self.path.

Return type:

dict

get_shortest_path()

Determine shortest path between all keyframes.

prob(prev, next, temperature)

rand_seq()

Generates values in random order, equivalent to using shuffle in random without generation all values at once.

reversed_sections(tour)

Generator to return all possible variations where a section between two cities are swapped.

set_times(times)

setup_tsp(niter=50000, init_temp=10.0, alpha=0.999, fixed_start=False)

Setup parameters for Travelling Salesman Problem.

Parameters:

• niter (integer, optional) – Maximum number of iterations to find solution. Default: 50000

• init_temp (float, optional) – Initial temperature for simulated annealing when finding a solution. Lower initial temperatures result in an initial solution in first several iterations that changes more rapidly. Default: 10.0

• alpha (float, optional) – Exponent in cooling function in simulated annealing. Must be < 1. In each iteration, the temperature_new = temperature_old * alpha. Default: 0.999

• fixed_start (boolean, optional) – If true, the first point never changes when searching for shortest path. Default: False

tour_length(tour)

Calculate the total length of the tour based on the distance matrix

write_path(filename='path.dat')

Writes camera path to ASCII file

Parameters:

filename (string, optional) – Filename containing the camera path. Default: path.dat