2011

Table Of Contents
Show Vectors
The Show Vectors tool is a three input, single output image pass-through tool
that allows in-player viewing of 2D vectors as overlays on an RGBA image.
Images representing a 2D vector per pixel can be used as image inputs to
indicate pixel displacement from one frame to another. These 2D vector images
can either be generated for artistic effect, the result of an analysis, or imported
from a render generated from a 3D package.
The 2D vector (x, y) components are directly stored as the red and green
channels in the vector image; the blue and alpha channels are unused. The
Show Vectors tool makes viewing 2D vector images far more intuitive. Instead
of showing a red, green, yellow (mix of red and green) or black (negative
components) image, actual arrows are shown, indicating the origin, direction,
and amplitude of motion, for either the forward vector input image, the
backward vector input image, or both. Because the vectors are shown as
overlays on top of a regular RGBA image, the positional relationship between
the vectors and the RGBA image can clearly be seen. This is often crucial to
understand how the 2D vectors will affect that RGBA image.
Forward vectors
716 | Chapter 30 Vectors