User Manual

Fog 3D and Soft Clipping
The Fog3D node helps to create atmospheric depth cues.
Split screen with and without fog.
The Fog3D node works well with depth of field and antialiasing supported by the OpenGL
renderer. Since it is not a post-processing node (like the VolumeFog node found in the Nodes >
Position menu or Fog node in Nodes > Deep Pixel), it does not need additional channels like
Position or Z-channel color. Furthermore, it supports transparent objects.
The SoftClip node uses the distance of a pixel from the viewpoint to affect opacity, allowing
objects to gradually fade away when too close to the camera. This prevents objects from
“popping off” should the camera pass through them. This is especially useful with particles that
the camera may be passing through.
Geometry nodes such as the Shape3D node use a Matte Objects checkbox to enable masking
out parts of the 3D scene. Effectively, everything that falls behind a matte object doesn’t get
rendered. However, matte objects can contribute information into the Z-channel and the Object
ID channel, leaving all other channels at their default values. They do not remove or change any
geometry; they can be thought of as a 3D garbage matte for the renderer.
Circle shape used as a Matte
object to see the floor.
Chapter – 76 3D Compositing Basics 1581