Optics-2022 : Filters : S_NightSky
S_NightSky
Description
Generates a realistic starry night sky as viewed from a major city or a specified longitude and latitude. The stars are generated using a star database so that major constellations are visible where expected.
The S_NightSky filter comes from the Emmy award winning Boris FX Sapphire filter set.
Category
Render.
Controls
Presets
To select a preset, pick one from the Presets window.
Mode
Controls how the location is determined.
Night Sky
Location is set by adjusting Latitude, Longitude, and GMT Offset parameters.
Night Sky Locations
Location is set by choosing a city from the Location list.
Latitude
Latitude for specifying the location of the camera.
Longitude
Longitude for specifying location of the camera.
GMT Offset
Number of hours the specified time is offset from Coordinated Universal Time (UTC) or Greenwich Mean Time (GMT).
Location
Specifies which city to use to determine position on the Earth's surface. Available cities are scattered around each of the continents.
Note: The Location parameter is only visible in Night Sky Locations mode.
Anchorage
Anchorage, Alaska, United States, North America.
Astana
Astana, Kazakhstan, Asia.
Beijing
Beijing, China, Asia.
Boston
Boston, Massachusetts, United States, North America.
Cairo
Cairo, Egypt, Africa.
Caracas
Caracas, Venezuela, South America.
Chicago
Chicago, Illinois, United States, North America.
Hong Kong
Hong Kong, China, Asia.
Istanbul
Istanbul, Turkey, Asia/Europe.
Johannesburg
Johannesburg, South Africa, Africa.
Lagos
Lagos, Nigeria, Africa.
Lima
Lima, Peru, South America.
London
Longon, England, Europe.
Los Angeles
Los Angeles, California, United States, North America.
Madrid
Madrid, Spain, Europe.
Mexico City
Mexico City, Mexico, North America.
Moscow
Moscow, Russia, Europe.
Mumbai
Mumbai, India, Asia.
Nairobi
Nairobi, Kenya, Africa.
New York City
New York City, New York, United States, North America.
Nuuk
Nuuk, Greenland, North America.
Perth
Perth, Australia, Australia.
Punta Arenas
Punta Arenas, Chile, South America.
Rio de Janeiro
Rio de Janeiro, Brazil, South America.
Central Siberia
Siberia, Russia, Europe.
Stockholm
Stockholm, Sweden, Europe.
Sydney
Sydney, Australia, Australia.
Tokyo
Tokyo, Japan, Asia.
Vancouver
Vancouver, Canada, North America.
Yellowknife
Yellowknife, Canada, North America.
Warsaw
Warsaw, Poland, Europe.
Star Size
The size of stars in pixels.
Star Brightness
The overall brightness of the stars.
Altitude
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.
Azimuth
Camera rotation left and right. An azimuth of zero points North and positive values rotate East (right).
Field Of View
Camera field of view.
Time
Year
Which year to use to look up star locations.
Month
Which month to use to look up star locations.
Day
Which day of the month to use to look up star locations.
Hour
The hour of the day to use to look up star locations. This should be specified in military (24 hour) format.
Minute
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.
Magnitude Limit
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.
Vary Size By Mag
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.
Star Saturation
Scales the color saturation of the star. Set to 0 for all white stars. Increase for more intense colors.
Glare
Glare Brightness
The overall brightness of the glares.
Glare Size
Scales the size of the glares.
Rel Height
Scales the vertical dimension of the glares making them elliptical instead of circular.
Glare Color
Scales the color of the glares.
Glare Rotate
Rotates the ray elements of the glares, if any, in degrees.
Rays Length
Adjusts the length of the rays without changing their thickness.
Glare Star Mag
Specify which stars should be glared based on magnitude. Stars brighter than this (i.e. lower magnitude) will get glares.
Streaks
Streak Length
Length of streaks or rays radiating out from the brightest stars.
Streak Brightness
Brightness of streaks radiating out from the brightest stars.
Streak Number
Number of streaks radiating out from the brightest stars.
Streak Rotation
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.
Streak Symmetry
How symmetrically the rays are drawn. This affects both spacing and length.
Streak Star Mag
Specify which stars should have streaks based on magnitude. Stars brighter than this (i.e. lower magnitude) will get streaks.
Bg Brightness
Scales the brightness of the image.
Combine
Determines how the stars are combined with the image.
Stars Only
Renders only the stars.
Mult
The stars are multiplied by the image.
Add
The stars are added to the image.
Screen
The stars are blended with the image using a s Screen operation.
Difference
The result is the difference between the stars and image.
Overlay
The stars are combined with the image using an Overlay function.
Seed
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.