v0.14.0

• Add vector math library.
• Add CZML output for sensor visualization.
• Fix objects not updating properly when image renderer is off.

v0.13.1

• Add argument to set folder name in gen_multi.
• Add environment variable, SATSIM_SKYFIELD_LOAD_DIR, to specify location of Skyfield ephemeris files.
• Fix incorrect CZML output when image renderer is off.

v0.13.0

• Add ephemeris objects that are propagated with the Lagrange interpolator.
• Add Cesium CZML output. Set sim option save_czml to false to disable.
• Add CSV text file star catalog loader. This feature is useful for small catalogs such as Hipparcos and simulating wide FOV sensors.
• Add multiplier and clipping for radial cosine.
• Add option to skip image rendering. Set sim option mode to none to bypass image rendering.
• Update interfaces for newest version of Skyfield, Poliastro, POPPY, and AstroPy.
• Fix star renderer issue removing stars in field of view for non-square arrays.

v0.12.0

• Add augmentation of SatNet tf.data.Dataset. This feature allows injecting synthetic targets into real data during training.
• Add FFT convolution to add_patch sprite render and scatter_shift image augmenter for speed improvement.
• Add cache last PSF FFT to fftconv2p for speed improvement for static PSFs.
• Add two-body state vector as a trackable target.
• Add moon and sun model and misc methods to calculate phase angle and target brightness.