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PA | szmul_pa – When enabled, animation of the Size Multiplier parameter is evaluated individually for each particle. The Age channel of individual particles is treated as if it is the Timeline itself, and animation applied to the Size Multiplier is evaluated over it. Therefore, the Size Multiplier animation is applied to each particle, starting at its time of birth. For example, animating the Size Multiplier to go from 1 to 0 over Timeline frames 0 to 30 will individually scale down each particle during the first 30 frames of its birth. Conversely, when this option is disabled, the Size Multiplier animation will treat the particles as a collection of points, and will scale them simultaneously, regardless of their current age. For example, animating the Size Multiplier to go from 1 to 0 over Timeline frames 0 to 30 will simultaneously scale all particles in the simulation over the first 30 Timeline frames, and none will be visible on frame 31. Note that the particle Age Channel export must be enabled from the Output roll-out of the Phoenix FD Simulator.

Size Addend | szaddend – Specifies an additional addend amount, which is added right after the calculation of the Size Multiplier.

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