Do you notice that sometimes, the number in transform is weird. Like:
- -90 to -89.9801
- 270 be 271.00001
- or like this
Even that what you set originally is 90 or 270.
Why does this happen? Does it have some connections of unity's mechanisim?
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where did u place the object in hirarchy or direct in scene? – Muhammad Faizan Khan Mar 21 '16 at 06:55
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I feel that this usually happen, when I duplicate object. – tim Mar 21 '16 at 07:28
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And this happend, not only in rotation. Sometimes, in scale or in position – tim Mar 21 '16 at 07:30
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if u duplicate then it will take same transform property – Muhammad Faizan Khan Mar 21 '16 at 07:34
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I feel that if u place an object directly to the scene then its change its transform while if u directly put in your hierarchy it will remain same – Muhammad Faizan Khan Mar 21 '16 at 07:35
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@MohammadFaizanKhan maybe u r right – tim Mar 21 '16 at 07:36
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yes I have experience it – Muhammad Faizan Khan Mar 21 '16 at 07:37
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It also maybe caused by the static objects baking – tim Mar 21 '16 at 08:04
2 Answers
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I think the reason is that Unity does calculate its transformations with quaternions. The Euler Angles have to be calculated into a quaternion and so there's a little inaccurateness.
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The value displayed is a conversion from the quaternion value.
https://en.wikipedia.org/wiki/Conversion_between_quaternions_and_Euler_angles
Float always brings a bit of inaccuracy.
Why Are Floating Point Numbers Inaccurate?
But mostly the first part. What is displayed is just for you to understand but this is not what Unity uses. You will also notice some jumps from 180 to -90 or 360 to -180 when you are rotating all axis. This is again due to the fact that a quaternion is just a direction regardless the 3 axis (quaternion actually has 4 dimensions) but based on angles and trigonometry.
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Then it is just the float rounding and inaccuracy. Sometimes you will see the scientific notation. – Everts Mar 21 '16 at 08:50