User Manual

Shadow [SH]
The Shadow node
Shadow Node Introduction
Shadow is a versatile node used in the creation of a drop shadow, based on the Alpha channel
in an image. Optionally, a second image can be used as a depth matte to distort the shadow
based on the varying depth in a background image.
Input
The three inputs on the Shadow node are used to connect a 2D image that causes the shadow.
A depth map input and an effect mask can be used to limit the area where trails appear.
Typically, the output of the shadow is then merged over the actual background in the
composite.
–
Input: The orange input is used for the primary 2D image with Alpha channel that is
the source of the shadow.
–
Depth: The green Depth map input takes a 2D image as its input and extracts a
depth matte from a selected channel. The light Position and Distance controls can
then be used to modify the appearance of the shadow based on depth.
–
Effect Mask: The blue input is for a mask shape created by polylines, basic primitive
shapes, paint strokes, or bitmaps from other tools. Connecting a mask to this input
limits the area where the shadow appears. An effects mask is applied to the tool
after the tool is processed.
NOTE: The Shadow node is designed to create simple 2D drop shadows. Use a Spot
Light node and an Image Plane 3D node for full 3D shadow casting.
Basic Node Setup
Below, the Shadow node uses the output of an image with Alpha and connects to the
foreground of a Merge. The shadow is shown over the background input to the Merge.
A Shadow node is generated from the
MediaIn2 and shown over MediaIn1
Chapter – 88 Effect Nodes 1959