Force Fields
Force fields affect particles by attracting, repelling or accelerating them in some direction. They can be used to model gravity, wind and other natural effects. Add force fields using the object list or alternatively, directly place a force field in the scene by right-clicking on the effect preview while holding CTRL. The following properties can be adjusted in the property panel to influence the behavior of a force field.
General
Property | Description |
|---|---|
| Lifetime | Time period during which the force field is active. If Repeat is selected, the force field stays active and repeats its behavior. |
| Type | Type of the force field. Point forces attract or repel particles based on their distance to the force center. Particles near the center are influenced more than particles farther away. They have a circular area of effect. Area forces accelerate particles in a specific direction if they move into into the force area. In contrast to a point force, this direction is not towards or away from the force center, but set as a separate parameter. |
| Width | Horizontal extent of the force field. |
| Height | Vertical extent of the force field. |
| Orientation | Orientation of the force field, in degrees. |
| Excluded Emitters | List of emitters not affected by the force field. |
Motion
Property | Description |
|---|---|
| Position | Position of the force field. You can also specify a motion path along which the force field travels over its lifetime. |
Physics
Property | Description |
|---|---|
| Direction | Direction in which particles are accelerated, in degrees. Only applies to area force fields. |
| Strength | How strongly particles are affected by the force field. Negative values reverse the force direction. Point forces then repel particles, for example. |
| Grid | Number of cells used for the randomization grid. Each grid cell has a slightly different, randomly selected force direction and strength, which is influenced by the variance parameters. This is especially useful for more organic motion that moves particles with some variation in strength and direction. Click  to randomize the strength and direction values of the grid cells. |