The Kill Modifier provides a way to force particles to stay within certain bounds. Those which stray outside the defined boundary will be killed.
Here is its interface:
For the 'Groups Affected' tab and for the buttons at the bottom of the interface, please see the 'Common interface elements' page. This modifier does not have a Falloff tab.
Uncheck this switch to disable the modifier.
Independent [default setting]
In this mode, the modifier will work in the same way as a standard Cinema 4D particle modifier: particles will be affected if they come into the field of effect of the modifier. X-Particle Actions have no effect on the modifier in this mode.
In this mode, the modifier will only act on a particle when told to do so by an Action. Until that point, the particle will not be affected, but once activated for a particular particle, the modifier will continue to influence it as long as it is in the field of effect of the modifier. The modifier's effect on a particle can be halted by means of another Action, if desired.
This defines the nature of the bounding volume.
The particles must stay inside the modifier's boundary (shown as a yellow box or sphere).
The particles must stay outside the modifier's boundary (shown as a yellow box or sphere).
One or more objects can be dragged into the modifier's Objects list. The effect depends on the flags which are set for each object.
Outside Camera FOV
In this mode particles are killed if they are outside the field of view of the current camera (note: this will only work correctly with Perspective cameras).
The shape of the modifier, either a Box or a Sphere. Only applies when 'Volume' is set to 'Inside Bounds' or 'Outside Bounds'.
The size of the object when 'Shape' is set to 'Box' (not available in Objects or Camera modes).
The size of the object when 'Shape' is set to 'Sphere' (not available in Objects or Camera modes).
This is a list of bounding objects. Each object in the list (which must be a polygon object of some kind) has two flags.
Green tick/Red cross
The object will only act as a bounding object if the green tick is present. It is disabled if it has a red cross.
In this screenshot the Cube has the Outside flag, while the Sphere has the Inside flag:
- The Outside flag means that the particles will die if they are outside the Cube.
- The Inside flag means that the particles will die if they are inside the Sphere.