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The Particle nodes are used to generate a large number of duplicated objects that automatically animate. They are used to create elements like falling rain, fireworks, smoke, pixie dust, and much more. There are endless possibilities. Particles in Fusion consist of a set of nodes that are strung together in a chain for generating, modifying, and rendering particles in a 2D or 3D scene.
To begin, every particle system you create must contain two fundamental nodes:
— pEmitter: Used to generate the particles and control their basic look, motion. and behavior.
— pRender: Used to render the output of the pEmitter into a 2D or 3D scene. When creating particles, you only ever view the pRender node.
Particle Nodes
The remaining particle nodes modify the pEmitter results to simulate natural phenomena like gravity, flocking, and bounce. The names of particle nodes all begin with a lowercase p to differentiate them from non-particle nodes. They can be found in the particles category in the Effects Library.
pAvoid [pAv]
The pAvoid node
pAvoid Node Introduction
The pAvoid node is used to create a region or area within the image that affected particles attempt to avoid entering and crossing.
It has two primary controls. The first determines the distance from the region a particle should be before it begins to move away from the region. The second determines how strongly the particle moves away from the region.
A pAvoid node creates a “desire” in a particle to move away from a specific region. If the velocity of the particle is stronger than the combined distance and strength of the pAvoid region, the
particle’s desire to avoid the region does not overcome its momentum and the particle crosses that region regardless.
Inputs
The pAvoid node has a single orange input by default. Like most particle nodes, this orange input accepts only other particle nodes. A green bitmap or mesh input appears 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.
— Region: The green or magenta 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 particles avoid.
Basic Node Setup
The pAvoid node is placed in between the pEmitter and pRender. A Shape 3D node is used to create the region the particles will avoid.
A pAvoid node using a Shape 3D node as the region to avoid
Inspector
The pAvoid controls
The Random Seed slider and Randomize button are presented whenever a Fusion node relies on a random result. Two nodes with the same seed values will produce the same random results. Click the Randomize button to randomly select a new seed value, or adjust the slider to manually select a new seed value.
Determines the distance from the region a particle should be before it begins to move away from the region.