Unity technical manual - size over lifetime and size by speed

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Premise

This is what Xiao Kong insisted on writing Unity Novice series , Welcome to taste .

Novice （√√√）

bosses （√）
The particle section is a series of articles , And the introduction was very detailed , Suggest Collection .

Practice process

Life cycle size （Size over Lifetime） Sub module

The module can realize that the particle size changes with the change of life cycle .

Separate Axes- Separation shaft ： It means that it can be controlled separately after opening x Axis y Axis z Axis , By default, the particle system as a whole is not checked . To achieve non-uniform particle scaling, check the separation axis , Then change them separately x Axis y Axis z Axis , Be careful z Only when mesh particles are valid .

Size： Particle size changes over the life cycle , A curve or hyperbolic interval or two value interval is used to define how the particle size changes in its life cycle .

Application scenarios ： For fireballs produced by fuel combustion , Flame particles tend to expand after emission , But in the later stage, it gradually disappears and shrinks as the fuel runs out and the flame dissipates . under these circumstances , There will be a curve that first rises and then falls to a smaller size “ hump ”.

Speed determines size （Size by Speed） Sub module

The module can control different particle velocities and display different sizes , For example, explosive effect , Realistic physical effects , The speed of flying out is usually slightly smaller , The larger the volume and mass, the slower the general speed of the object .

The module attributes and speed colors （Color By Speed） Module attributes are basically the same . The separation shaft can be used x Axis y Axis z Axis for different scaling to achieve non-uniform effect .

Create a new scene , You can create a new particle system object , Then the main module's 【Start Speed】 Set to two numerical ranges, for example 1-10. Then check the activation speed （Size By Speed） modular , Set the speed range to 1-10, Then modify the curve , You can see the effect （ Remember to open the real-time preview, otherwise you have to see the effect after running ）, In actual projects, the speed range of the module is usually the same as 【Start Speed】 The interval range is consistent , So you can see the corresponding relationship at a glance , Even after a long time, you can look back and see clearly , Otherwise, if you look back at the particle, you have to calculate a wave by yourself , Waste time in vain .

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author ： Xiaokong and Xiaozhi Xiaokong
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