Unity technical manual - lifecycle lifetimebyemitterspeed - color in the cycle coloroverlifetime- speed color colorbyspeed

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Premise

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

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

Practice process

Emitter lifecycle （Lifetime by Emitter Speed） Sub module

Activate this attribute to see the effect when you move the whole particle system object . By default, moving fast produces fewer particles . Like the flame of a candle , The fire will decrease as you move , Stillness and no wind will restore the size of the flame .

Life cycle color （Color Over Lifetime） Sub module

This module is used to control how the color and transparency of particles change in the life cycle , Support double gradient , The particles will randomly take one of the gradients . The left point of the gradient bar indicates the beginning of the particle life , The right side of the gradient bar indicates the end of the particle life .

The color of many types of natural and surreal particles changes over time , So this attribute has many uses . for example , Strong white sparks cool as they pass through the air , Magic may suddenly turn rainbow . But just as important Alpha（ transparency ） The change of . Particles burn out when they reach the end of their life cycle 、 Fading or dissipation is a very common phenomenon （ for example , Strong spark 、 Fireworks and smoke particles ）, This effect can be achieved by a simple gradient gradient .

Speed color （Color By Speed） Sub module

The module can set the color of particles according to the particle speed （ A unit of distance per second ） change .

Color： The color gradient of particles defined within the speed range .

Speed Range： The lower and upper limits of the speed range to which the color gradient is mapped （ Out of range speeds are mapped to the endpoints of the ramp ）.

A burning or luminous particle （ Like a spark ） It burns more brightly when moving rapidly in the air （ for example , When the spark comes into contact with more oxygen ）, But as they slow down, they darken slightly . To simulate this , You can use Color By Speed modular , Make the gradient white at the upper limit of the speed range , The lower limit is red （ In the spark example , Faster particles will appear in white , The slower particles are red ）.

You can create a new particle system that will be the main module of 【Start Speed】 Set to two numerical ranges, for example 1-10. Then activate the speed color （Color By Speed） modular , Set the speed range to 1-10, Then change the color value , You can see the effect , In actual projects, the speed range of the module is usually the same as 【Start Speed】 The interval range is consistent , You can see the corresponding relationship at a glance , Otherwise, you have to calculate a wave by yourself .

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author ： Xiaokong and Xiaozhi Xiaokong
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