• 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
2
Question by Croolsby · Sep 20, 2015 at 07:51 AM · collisionrigidbodykinematicfreezepositionfreezerotation

Rigidbody: Freeze All vs InKinematic

If you set a rigidbody to either kinematic or freeze all the position and rotation, it will be unaffected by physics. What are some other consequences freezing verses setting to kinematic?

I can think of one. A kinematic rigidbody will not send collision events, but a frozen one will.

This is the reason I am asking. I want to use the built-in collision detection, but I need to resolve the collision in non-realistic ways. So I want kinematic rigidbodies, but those don't send collision events, so I'm thinking of just freezing the position and rotation.

I'm wondering if there are some performance differences between the two.

Comment
Add comment · Show 2
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 maccabbe · Sep 20, 2015 at 04:26 PM 0
Share

Have you tried using OnTriggerEnter/OnTriggerExit/OnTriggerStay? Unlike OnCollision they can be used with kinematic rigidbodies.

http://docs.unity3d.com/ScriptReference/Collider.OnTriggerEnter.html

http://docs.unity3d.com/ScriptReference/Collider.OnTriggerExit.html

http://docs.unity3d.com/ScriptReference/Collider.OnTriggerStay.html

avatar image kaliAJ maccabbe · Jun 30, 2020 at 07:26 AM 0
Share

@Croolsby I am experiencing something different here when I freeze the rotation without freezing position the collision event does happen. but when I froze them all(position, rotation) it just doesn't accept any collisions.

@maccabbe the triggers won't work since it needs one of the object set as a trigger, but not both. and since I have the prefab and I am instantiating a copy of the prefab and detecting the collision. this won't work.

0 Replies

· Add your reply
  • Sort: 

Your answer

Hint: You can notify a user about this post by typing @username

Up to 2 attachments (including images) can be used with a maximum of 524.3 kB each and 1.0 MB total.

Welcome to Unity Answers

The best place to ask and answer questions about development with Unity.

To help users navigate the site we have posted a site navigation guide.

If you are a new user to Unity Answers, check out our FAQ for more information.

Make sure to check out our Knowledge Base for commonly asked Unity questions.

If you are a moderator, see our Moderator Guidelines page.

We are making improvements to UA, see the list of changes.



Follow this Question

Answers Answers and Comments

4 People are following this question.

avatar image avatar image avatar image avatar image

Related Questions

Enemy rigidbody and bullet collisions 1 Answer

Object gravity but no collisions 0 Answers

How to make kinematic rigidbody react to some collisions 6 Answers

Kinematic RigidBody does not collide with Wall using MovePosition 2 Answers

seeking collision scenario solution : falling anvil vs. player 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