How I can know surface angle?

Question

Hi, I have to know rotation of surface i'm looking, but I dont know how I should implement it? I'm not searching complete code, but even idea how I could do that?

alt text

Like this, arrows are showing surfaces, I need to know rotation of surface i'm looking. I was thinking multiple raycasts, but not sure how to implement that. Any idea?

EDIT:

New picture (I'm bad at describing, sorry!), maybe it helps someone.

alt text

^ This raycast should find angle information.

Answer 1

Best Answer

Answer by Loius · Jan 09, 2013 at 06:10 PM

A raycast hit contains the ".normal" attribute, which is a Vector3 representing the hit plane's normal (the direction its "outside" face is facing).

You can use Vector3.Angle(normal, yourRay) to get the angle between those, if that's what you're looking for.

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Wolfram · Jan 09, 2013 at 06:12 PM 2

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You'll need -yourRayDirection ins$$anonymous$$d of yourRay, otherwise the value returned is 180°-angle. Also note that smooth surface normals and probably also bumpmaps will modify the normal, and therefore the angle.

Eeppi · Jan 10, 2013 at 02:47 PM 0

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Thanks for the answer. I'm probably idiot, but I can't get this working. $$anonymous$$y code is like this now:

var hit : RaycastHit;

var direction = transform.TransformDirection(Vector3.forward);

var ray = transform.position;

var normal: Vector3 = Vector3(hit.normal.x, hit.normal.y, hit.normal.z);

if(Physics.Raycast(ray,direction,hit)){

var test = Vector3.Angle(normal,ray);

Debug.Log(test);

}

Wolfram · Jan 10, 2013 at 02:50 PM 2

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As I've written above, you need to use "-direction", not "ray". Also, directly use hit.normal ins$$anonymous$$d of creating a local variable, it's faster. And currently you're assigning "normal" before calling Physics.Raycast, so the value will be incorrect.

Wolfram · Jan 10, 2013 at 02:51 PM 2

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Also note that "transform.TransformDirection(Vector3.forward)" is simply "transform.forward", which is also faster.

Answer 2

Answer by hotozi · May 23, 2019 at 08:14 PM

Don't break your head i found the simplest and best answer for calculation... RaycastHit has a transform in which it is linked to the collider once it is called

 Rayhit.transform.eulerAngles

''

 var Rayhit: RaycastHit;
 var HitRay= Physics.Raycast(transform.position,transform.forward,Rayhit,1);
 if(HitRay)
 print(Rayhit.transform.eulerAngles.y);

''

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Bunny83 · May 24, 2019 at 12:15 AM 3

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What does the object rotation on the y axis has to do with the surface angle? Yes, if your object is aligned with the principal axis you can work out the surface angle from the object rotation. However if you have a look at the OPs image the object has several different surfaces at different angles. So your answer is not really simpler nor the best answer. The best answer was already given by Loius over 6 years ago.

Apart from that you should avoid giving example code in UnityScript as it has been deprecated long time ago and is no longer supported in the latest Unity versions.

ps: i removed your second answer on the other similar question. Please do not bump old questions which already have been answered. Especially don't spam old outdated code to somewhat similar questions. Take the time to read the question and answer that question.

How I can know surface angle?

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