User Manual

Common Controls
Image and Settings Tabs
The Image and Settings tabs in the Inspector are duplicated in many Generator nodes. These
common controls are described in detail at the end of this chapter in “The Common
Controls” section.
Day Sky [DS]
The DaySky node
Day Sky Node Introduction
The Day Sky node aims to produce a simulation of the daylight produced at a specific time and
location on the earth, and generates a high dynamic range image that represents a map of that
light. It is not a sky generator, although it could be combined with a cloud generator or Noise
node to produce one.
NOTE: This generator is a practical implementation of the research paper, A Practical
Analytical Model for Daylight, by Preetham, Shirley, and Smits. A copy of the original
paper can be found at the website for the Visual Simulation Group at the University of
Utah [https://www.cs.utah.edu/~shirley/papers/sunsky/sunsky.pdf].
Inputs
There is a single input on the Day Sky node for an effect mask to limit the area where the day
sky simulation occurs is applied.
–
Effect Mask: The optional blue effect mask input accepts a mask shape created
by polylines, basic primitive shapes, paint strokes, or bitmaps from other tools.
Connecting a mask to this input limits the Day Sky to only those pixels within the mask.
Basic Node Setup
The Day Sky node is a generator, so it typically starts the branch of a node tree and connects
to some other node, like a Merge node.
A Day Sky connected as the background to a Merge node
Chapter –89 Generator Nodes 1978