Search in
Sort by:

Question Status:

Search help

  • Simple searches use one or more words. Separate the words with spaces (cat dog) to search cat,dog or both. Separate the words with plus signs (cat +dog) to search for items that may contain cat but must contain dog.
  • You can further refine your search on the search results page, where you can search by keywords, author, topic. These can be combined with each other. Examples
    • cat dog --matches anything with cat,dog or both
    • cat +dog --searches for cat +dog where dog is a mandatory term
    • cat -dog -- searches for cat excluding any result containing dog
    • [cats] —will restrict your search to results with topic named "cats"
    • [cats] [dogs] —will restrict your search to results with both topics, "cats", and "dogs"

Mirror a FRotator along a plane

I have a FRotator and want to mirror it along a plane. The plane is represented by a normal vector. How do I achieve that?

Product Version: UE 4.18
more ▼

asked Feb 13 '18 at 11:06 PM in C++ Programming

avatar image

5 1 2 5

(comments are locked)
10|2000 characters needed characters left
Viewable by all users

1 answer: sort voted first

From an unity answer talking about UE4

 var objectQuat; // from world rotation
 var mirrorNormalQuat = new Quaternion(plane.x, plane.y, plane.z, 0);
 var reflectedQuat = mirrorNormalQuat * objectQuat * mirrorNormalQuat;

i'm not sur if the plane is represented by it's normal here, but i guess you can give it a try

edit: according to this plane is indeed represented by it's normal

more ▼

answered Feb 13 '18 at 11:36 PM

avatar image

1.5k 14 18 32

avatar image Kojox Feb 13 '18 at 11:54 PM

thank you for your answer. I've tried it using this code:

 FQuat mirrorNormalQuat = FQuat(normal.X, normal.Y, normal.Z, 0);
 FQuat reflectedQuat = mirrorNormalQuat * paramRot.Quaternion() * mirrorNormalQuat;
 resultRotation = reflectedQuat.Rotator();

the result is a rotation just pointing upward. Is there maybe something wrong with this code? (just using the paramRot as rotation works as expected)

avatar image Kojox Feb 14 '18 at 12:07 AM

alright never mind the code works now perfectly fine. there were just a few other problems I had to fix.

(comments are locked)
10|2000 characters needed characters left
Viewable by all users
Your answer
toggle preview:

Up to 5 attachments (including images) can be used with a maximum of 5.2 MB each and 5.2 MB total.

Follow this question

Once you sign in you will be able to subscribe for any updates here

Answers to this question