Make a perspective flythrough
Move a perspective camera toward and past a simulated galaxy.
Before you start
Use the THOR and plotting setup, download the galaxy cutout, and install FFmpeg. Put the files below in the same working directory as the cutout. The projected-map tutorial explains the camera and temperature weighting used here.
Configure
Download flythrough.yaml.
This is a complete configuration; its camera settings under
raytracer.operators.projections include:
mode: traverse
view: perspective
position: [0.525, 0.489, 0.536]
direction: [0.0, 0.0, 1.0]
up: [0.0, 1.0, 0.0]
fov_up: 60
travel_distance: 0.4
nframes: 96
npixels: [384, 256]
The camera travels along +z, passing beside the galaxy. Positions and
travel_distance use fractions of the cutout domain; fov_up is the vertical
field of view in degrees. It renders 96 frames at 384 × 256 pixels.
Run
The run writes flythrough/output.zr. Rerunning replaces that output.
Make the movie
Download plot_flythrough.py and thorplot.py into your working directory, then run:
In the output movie flythrough.mp4, each frame shows density-weighted
temperature along the rays ahead of the camera. The field of view stays fixed
while nearby structure grows on screen. A perspective view has no single
physical scale across all depths.