User Manual

pCustomForce [pCF]
The pCustomForce node
pCustom Force Node Introduction
The pCustom Force node allows you to change the forces applied to a particle system or
subset. This node is quite likely the most complex and the most powerful node in Fusion. If you
are experienced with scripting or C++ programming, you should find the structure and
terminology used by the Custom Force node to be familiar.
The forces on a particle within a system can have their positions and rotations affected by
forces. The position in XYZ and the Torque, which is the spin of the particle, are controlled by
independent custom equations. The Custom Force node is used to create custom expressions
and filters to modify the behavior. In addition to providing three image inputs, this node will
allow for the connection of up to eight numeric inputs and as many as four XY position values
from other controls and parameters in the node tree.
Inputs
The pCustom Force node has three inputs. Like most particle nodes, this orange input accepts
only other particle nodes. A green and magenta are 2D image inputs for custom image
calculations. Optionally there are teal or white bitmap or mesh inputs, which appear on the
node when you set the Region menu in the Region tab to either Bitmap or Mesh.
–
Input: The orange input takes the output of other particle nodes.
–
Image 1 and 2: The green and magenta image inputs accept 2D images that are
used for per-pixel calculations and compositing functions.
–
Region: The teal or white region input takes a 2D image or a 3D mesh depending
on whether you set the Region menu to Bitmap or Mesh. The color of the input is
determined by whichever is selected first in the menu. The 3D mesh or a selectable
channel from the bitmap defines the area where the pCustom Force takes effect.
Basic Node Setup
The pCustom Force node is inserted between a pEmitter and pRender node to serve as a
catalyst for particles using advanced C++ and scripting.
A pCustom Force is applied to the particles generated by the pEmitter
Chapter – 103 Particle Nodes 2278