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| 13 Jan 2016 07:37 PM |
why "w" needs to be the cosine of theta/2? why the components of the vector should be multiplied by the sine of theta/2? why it's divided by two? |
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nox7
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| Joined: 29 Aug 2008 |
| Total Posts: 27467 |
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| 13 Jan 2016 08:53 PM |
That is not correct. You may be getting confused if you read this page (http://wiki.roblox.com/index.php?title=Quaternions_for_rotation#Quaternion_from_Axis-Angle) on the Wiki.
It says that is how you would get a quaternion from an axis-angle representation. It demonstrates this because a quaternion is not easily visualized, so they recommend converting to axis-angle instead for visual purposes. |
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