User Manual

There are three Position nodes that can take advantage of World Position Pass data.
 Nodes > Position > Volume Fog
 Nodes > Position > Volume Mask
 Nodes > Position > Z to World
 The “Dark Box”
Empty regions of the render will have the Position channel incorrectly initialized to (0,0,0). To
get the correct Position data, add a bounding sphere or box to your scene to create distant
values and allow the Position nodes to render correctly.
Without a bounding mesh to generate Position values, the fog fills in the background incorrectly.
Point Clouds
The Point Cloud node is designed to work with locator clouds generated from 3D tracking
software. 3D camera tracking software, such as SynthEyes and PF Track, will often generate
hundreds or even thousands of tracking points. Seeing these points in the scene and
referencing their position in 3D and screen space is important to assist with lining up live action
and CG, but bringing each point in as an individual Locator3D would impact performance
dramatically and clutter the node tree.
Point cloud in the viewer.
Chapter – 76 3D Compositing Basics 1584