• Products
  • Solutions
  • Made with Unity
  • Learning
  • Support & Services
  • Community
  • Asset Store
  • Get Unity

UNITY ACCOUNT

You need a Unity Account to shop in the Online and Asset Stores, participate in the Unity Community and manage your license portfolio. Login Create account
  • Blog
  • Forums
  • Answers
  • Evangelists
  • User Groups
  • Beta Program
  • Advisory Panel

Navigation

  • Home
  • Products
  • Solutions
  • Made with Unity
  • Learning
  • Support & Services
  • Community
    • Blog
    • Forums
    • Answers
    • Evangelists
    • User Groups
    • Beta Program
    • Advisory Panel

Unity account

You need a Unity Account to shop in the Online and Asset Stores, participate in the Unity Community and manage your license portfolio. Login Create account

Language

  • Chinese
  • Spanish
  • Japanese
  • Korean
  • Portuguese
  • Ask a question
  • Spaces
    • Default
    • Help Room
    • META
    • Moderators
    • Topics
    • Questions
    • Users
    • Badges
  • Home /
avatar image
Question by DanMarionette · Jan 29, 2011 at 10:00 PM · animationparticlescolortransparencyalpha

How to change the alpha of a spawned particle?

Hello,

I have some particles(space dust) that spawn from an emitter attached to the players space ship. I want the dust to give the player a sense of motion when the move their ship. What I'm looking for is to set the alpha of the particles based on the ships velocity.

So as the player slows down the particles fade away and as they speed up the particles become brighter.

This means changing the alpha value of particles that have been emitted.

Any help would be great. Thanks

Comment

People who like this

0 Show 0
10 |3000 characters needed characters left characters exceeded
▼
  • Viewable by all users
  • Viewable by moderators
  • Viewable by moderators and the original poster
  • Advanced visibility
Viewable by all users

1 Reply

  • Sort: 
avatar image
Best Answer

Answer by anomalous_underdog · Jan 29, 2011 at 10:53 PM

Get the instance of the Particle Animator and edit ParticleAnimator.colorAnimation. Its an array of 5 colors. A color has an alpha value that goes from 0.0 to 1.0. With 1.0 being fully opaque.

Have the first color's alpha set to 0.0, the third and preceding colors' alpha set to 0.0.

When the velocity changes, store the ParticleAnimator.colorAnimation in a temporary variable, change the alpha of the second color depending on the ship's velocity, then assign the value back to ParticleAnimator.colorAnimation.

That's the basic idea.

Comment

People who like this

0 Show 1 · Share
10 |3000 characters needed characters left characters exceeded
▼
  • Viewable by all users
  • Viewable by moderators
  • Viewable by moderators and the original poster
  • Advanced visibility
Viewable by all users
avatar image DanMarionette · Jan 30, 2011 at 12:45 AM 0
Share

Thanks, this is perfect.

Unity Answers is in Read-Only mode

Unity Answers content will be migrated to a new Community platform and we are aiming to launch a public beta by June 9. Please note, Unity Answers is now in read-only so we can prepare for the final data migration.

For more information and updates, please read our full announcement thread in the Unity Forum.

Follow this Question

Answers Answers and Comments

No one has followed this question yet.

Related Questions

Particle systems in Unity are different during build 0 Answers

changes to colour alpha affect RGB values, but not in the same way 1 Answer

How to paint a texture transparent ? 0 Answers

All objects are getting transparent ? 1 Answer

Fading alpha of specific GUI.Label 0 Answers


Enterprise
Social Q&A

Social
Subscribe on YouTube social-youtube Follow on LinkedIn social-linkedin Follow on Twitter social-twitter Follow on Facebook social-facebook Follow on Instagram social-instagram

Footer

  • Purchase
    • Products
    • Subscription
    • Asset Store
    • Unity Gear
    • Resellers
  • Education
    • Students
    • Educators
    • Certification
    • Learn
    • Center of Excellence
  • Download
    • Unity
    • Beta Program
  • Unity Labs
    • Labs
    • Publications
  • Resources
    • Learn platform
    • Community
    • Documentation
    • Unity QA
    • FAQ
    • Services Status
    • Connect
  • About Unity
    • About Us
    • Blog
    • Events
    • Careers
    • Contact
    • Press
    • Partners
    • Affiliates
    • Security
Copyright © 2020 Unity Technologies
  • Legal
  • Privacy Policy
  • Cookies
  • Do Not Sell My Personal Information
  • Cookies Settings
"Unity", Unity logos, and other Unity trademarks are trademarks or registered trademarks of Unity Technologies or its affiliates in the U.S. and elsewhere (more info here). Other names or brands are trademarks of their respective owners.
  • Anonymous
  • Sign in
  • Create
  • Ask a question
  • Spaces
  • Default
  • Help Room
  • META
  • Moderators
  • Explore
  • Topics
  • Questions
  • Users
  • Badges