User Manual

XY Disparity
The XY Disparity channels indicate where each pixel’s corresponding matte can be found in a
stereo image. Each eye, left and right, will use this vector to point to where that pixel would be
in the other eye. This can be used for adjusting stereo effects, or to mask pixels in stereo space.
XY Disparity.
World Position Pass
World Position Pass (WPP) is an auxiliary channel, sometimes referred to as Point Position, XYZ
pass, or WPP. It is used to represent each pixel’s 3D (XYZ) position as RGB color values. The
result is a very colorful image.
The colors correspond to a pixel’s position in 3D, so if a pixel sits at 0/0/0 in a 3D scene, the
resulting pixel will have an RGB value of 0/0/0, or black. If a pixel sits at 1/0/0 in the 3D scene,
the resulting pixel is fully red. Due to the huge extent, 3D scenes that have the WPP channel
should always be rendered in 32-bit floating point to provide the accuracy needed.
The following image shows a 3D Rendering of a scene with its center sitting at 0/0/0 in 3D
space and the associated WPP. For better visibility, the WPP has been normalized.
Chapter – 69 Understanding Image Channels 1403