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Star trails: a frame from a film that uses it.
SkyNew

Star trails

Long-exposure star trails: every star drawn as an arc around the celestial pole, as long as the hours of rotation you set.

Version
1.0.0
Added
23 October 2026
Films
Not used in a film yet

Parameters

NameTypeDefaultRangeWhat it does
hours (Can change over time)number30 to 10 hhow long the exposure is: the trails are 15 degrees of arc for every hourCan change over time
densitynumber10.2 to 2how many stars leave a trail: 1 is a rich sky, below 0.5 a sparse one
brightness (Can change over time)number10 to 100how bright the trails are; 1 reads on a night sky, a daylight sky needs 40 to 100Can change over time
fadenumber0.30 to 1how much a trail fades toward its older end: 0 even, 1 a comet tail
colournumber0.70 to 1how strongly the trails show their stars' colours: 0 all white, 1 full
seedinteger40 to 999which stars: another seed is another sky

Use it in a film

film.js
elements: { 'star-trails': { hours: 3, density: 1 } }

Use it from your agent

Ask your agent to put it in a film. It finds the element by name.