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Question by AntGoober · Jun 15, 2020 at 11:58 AM · c#rotationlightingdaynight

Sun Variable Rotation

Hey, I'm trying to write a script that will allow the sun to rotate between different angles at differing speeds... So it rotates from 30° at 4am to 60° at 6am - then from 60° to 120° at 6pm - then from 120° to 150° at 8pm - so the sun moves 3 times faster in the morning and dusk basically...

I'm doing this to avoid long shadows as the day begins/ends that I seem to get with various day / night assests I've used, and also make the middle of the day last longer.

The times 4am, 6am etc. will change based upon the in-game season too, just FYI.

Any help would be greatly appreciated.

(Attached pic may be easier to understand than explanation) [1]: /storage/temp/161991-mfsun.png

mfsun.png (238.0 kB)
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Answer by SiniKettu_ · Jun 19, 2020 at 10:05 AM

I would recommend to create an animation of your sun, in which you can make the sun going three times faster during morning and dusk.

You can easily create an animation in Unity. If you don't know how : https://docs.unity3d.com/Manual/animeditor-CreatingANewAnimationClip.html


Another suggestion : create a curve on a mathematical software (i would use Xcas or Geogebra) and to a function because you seem to need a mathematical function which follow this kind of curve : alt text


Another suggestion : you can create a custom graph as a variable in Unity, which is editable from the inspector. And then your script will be able to read the Y value for a given X value.

Put a public variable in your class with the type AnimationCurve:

 public AnimationCurve myCurve;

You can evaluate the curve (get the y for an x value) with:

 float y = this.myCurve.Evaluate(x);


I hope i'm useful


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avatar image SiniKettu_ · Jun 19, 2020 at 10:18 AM 0
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Or you can do multiple linear functions which fit with what you want

So it rotates from 30° at 4am to 60° at 6am - then from 60° to 120° at 6pm - then from 120° to 150° at 8pm - so the sun moves 3 times faster in the morning and dusk basically...

avatar image AntGoober · Jun 19, 2020 at 11:23 AM 0
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"I hope I'm useful" - lol :) Thank you so much, I'll have a look into the methods you suggested!

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