The S_NightSky filter comes from the Emmy award winning Boris FX Sapphire filter set.

Render.

To select a preset, pick one from the Presets window.

Controls how the location is determined.

Location is set by adjusting Latitude, Longitude, and GMT Offset parameters.

Location is set by choosing a city from the Location list.

Latitude for specifying the location of the camera.

Longitude for specifying location of the camera.

Number of hours the specified time is offset from Coordinated Universal Time (UTC) or Greenwich Mean Time (GMT).

Specifies which city to use to determine position on the Earth's surface. Available cities are scattered around each of the continents.

Anchorage, Alaska, United States, North America.

Astana, Kazakhstan, Asia.

Beijing, China, Asia.

Boston, Massachusetts, United States, North America.

Cairo, Egypt, Africa.

Caracas, Venezuela, South America.

Chicago, Illinois, United States, North America.

Hong Kong, China, Asia.

Istanbul, Turkey, Asia/Europe.

Johannesburg, South Africa, Africa.

Lagos, Nigeria, Africa.

Lima, Peru, South America.

Longon, England, Europe.

Los Angeles, California, United States, North America.

Madrid, Spain, Europe.

Mexico City, Mexico, North America.

Moscow, Russia, Europe.

Mumbai, India, Asia.

Nairobi, Kenya, Africa.

New York City, New York, United States, North America.

Nuuk, Greenland, North America.

Perth, Australia, Australia.

Punta Arenas, Chile, South America.

Rio de Janeiro, Brazil, South America.

Siberia, Russia, Europe.

Stockholm, Sweden, Europe.

Sydney, Australia, Australia.

Tokyo, Japan, Asia.

Vancouver, Canada, North America.

Yellowknife, Canada, North America.

Warsaw, Poland, Europe.

The size of stars in pixels.

The overall brightness of the stars.

Camera rotation up and down. An altitude of 0 points out towards the horizon. 90 degrees points straight up. 180 looks backwards and upside down.

Camera rotation left and right. An azimuth of zero points North and positive values rotate East (right).

Camera field of view.

Which year to use to look up star locations.

Which month to use to look up star locations.

Which day of the month to use to look up star locations.

The hour of the day to use to look up star locations. This should be specified in military (24 hour) format.

The minute to use to look up star locations. Animate this parameter if you want to animate the stars over a period of real world time.

This controls which stars are currently visible based on their apparent magnitude.

Brighter stars have smaller magnitudes and dimmer stars have larger magnitudes, opposite from what you might think. The brightest stars in the sky have magnitude 0 or even −1. With the naked eye you can see stars up to magnitude 5 or 6, but a backyard telescope can see much fainter stars, up to 12 or more.

The larger Magnitude Limit, the more stars visible on screen. Increasing this parameter will add stars dimmer than the currently visible ones.

Make brighter stars larger and dimmer stars smaller so that brighter stars appear brighter and smaller stars appear dimmer. A value of 0 will make all stars the same size, while a value of 1 will approximate the apparent size differences naturally occurring in the sky. Magnitude 0 stars will remain the same size regardless of the value of this parameter. Negative magnitude stars (very bright stars) will grow with an increased parameter value. Positive magnitude stars (dim stars) will shrink with an increased parameter value.

Scales the color saturation of the star. Set to 0 for all white stars. Increase for more intense colors.

The overall brightness of the glares.

Scales the size of the glares.

Scales the vertical dimension of the glares making them elliptical instead of circular.

Scales the color of the glares.

Rotates the ray elements of the glares, if any, in degrees.

Adjusts the length of the rays without changing their thickness.

Specify which stars should be glared based on magnitude. Stars brighter than this (i.e. lower magnitude) will get glares.

Length of streaks or rays radiating out from the brightest stars.

Brightness of streaks radiating out from the brightest stars.

Number of streaks radiating out from the brightest stars.

Rotation of the streaks emanating from the stars. A 0 value means that the first streak will be vertical from the star if Streak Symmetry is set to 1.

How symmetrically the rays are drawn. This affects both spacing and length.

Specify which stars should have streaks based on magnitude. Stars brighter than this (i.e. lower magnitude) will get streaks.

Scales the brightness of the image.

Determines how the stars are combined with the image.

Renders only the stars.

The stars are multiplied by the image.

The stars are added to the image.

The stars are blended with the image using a s Screen operation.

The result is the difference between the stars and image.

The stars are combined with the image using an Overlay function.

Used to initialize the random number generator. The actual seed value is not significant, but different seeds produce different results and the same value should give a repeatable result.