Wayback Machinekoobas.hobune.stream
May JUN Jul
Previous capture 13 Next capture
2021 2022 2023
1 capture
13 Jun 22 - 13 Jun 22
sparklines
Close Help
  • 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
0
Question by Zillo7 · Jan 09, 2015 at 11:34 AM · rotationmathjointsjointlocalrotation

Attaching game objects with joints - Matching angles

I'm working on a 2D space combat game, and the feature I'm having a problem with is in attaching two spaceship objects together to dock them.

I'm using a slider joint to attach the ships together and move the smaller ship around the hangar of the larger one. The problem is in setting the angle property of the slider joint. When the carrier is facing north or south, everything works, but when facing any other direction, the small ship jumps from one point to another since the angle is not set correctly. Here's a gif of the results I get, and below is the relevant code. How do I set the angle properly?

     private GameObject HangarShip, CarrierShip; 
     private Vector3[] IntermediatePoints;

     internal void Move(int desiredPosition, SliderJoint2D joint)
     {
         CurrentPosition = Math.Max(-1, Math.Min(desiredPosition, IntermediatePoints.Length));

         //sets next point for the docked ship to slide to
         if (CurrentPosition == -1)
         { joint.connectedAnchor = RestingPostion; }
         else if (CurrentPosition == IntermediatePoints.Length)
         { joint.connectedAnchor = Runway; }
         else { joint.connectedAnchor = IntermediatePoints[CurrentPosition]; }
 
         //this line does not work properly
         joint.angle = (GetAngle(HangarShip.transform.position, CarrierShip.transform.TransformPoint(joint.connectedAnchor.x, joint.connectedAnchor.y, 0f)) - 90);
     }
 
     float GetAngle(Vector3 start, Vector3 target)
     {
         if (target.y == start.y)
         { return (start.x > target.x) ? 180 : 0; }
         if (target.x == start.x)
         { return (target.y > start.y) ? 90 : 270; }
 
         float tangent = (target.x - start.x) / (target.y - start.y);
         double ang = (float)Mathf.Atan(tangent) * 57.2958;
         if (target.y - start.y < 0) ang -= 180;
         return (float)ang;
     }

Comment
Add comment
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

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.

Follow this Question

Answers Answers and Comments

2 People are following this question.

avatar image avatar image

Related Questions

Child versus Parent rotations 3 Answers

Affine transformations to Object 3 Answers

Changing the forward rotation for LookAt 2 Answers

How to change the length of the object with configurable joint attached 0 Answers

Make 3D Player look exactly at mouse with ScreenToWorldPoint? (maths Question) 2 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