# Add3DParticlesScaleKeyFrame

## Description

Adds a size change at a certain point in a particle's life. Scale values are relative to the value set by Set3DParticlesSize so a scale of 2 means double its normal size and 0.5 is half its normal size. A scale added with time=1 will make the particle gradually transform to the given until it has been alive for 1 second when it will match the given size. The particle will then gradually transform from that size to the next size (if a next size exists).

## Definition

Add3DParticlesScaleKeyFrame( ID, time, scale )

void agk::Add3DParticlesScaleKeyFrame( UINT ID, float time, float scale )

## Parameters

- ID - The ID of the emitter to modify.
- time - The time that particles should become this size.
- scale - The scale relative to the normal particle size, must be greater then or equal to 0.