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240065e0
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three.js
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240065e0
编写于
1月 11, 2017
作者:
M
Mr.doob
提交者:
GitHub
1月 11, 2017
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Merge pull request #10553 from looeee/docs/euler/eulerTypeNote
Added note on intrinsic and extrinsic Euler types
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19c9247c
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docs/api/math/Euler.html
docs/api/math/Euler.html
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docs/api/math/Euler.html
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240065e0
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@@ -10,11 +10,12 @@
<body>
<h1>
[name]
</h1>
<div
class=
"desc"
>
A class representing [link:http://en.wikipedia.org/wiki/Euler_angles Euler Angles].
<br
/><br
/>
<div
class=
"desc"
>
A class representing [link:http://en.wikipedia.org/wiki/Euler_angles Euler Angles].
<br
/><br
/>
Euler angles describe a rotational transformation by rotating an object on its various
axes in specified amounts per axis, and a specified axis order.
</div>
Euler angles describe a rotational transformation by rotating an object on its various
axes in specified amounts per axis, and a specified axis order.
</div>
<h2>
Example
</h2>
...
...
@@ -51,9 +52,23 @@
<div>
The order in which to apply rotations. Default is 'XYZ', which means that the object will first be
rotated around its X axis, then its Y axis and finally its Z axis. Other possibilities are:
'YZX', 'ZXY', 'XZY', 'YXZ' and 'ZYX'.
Note that t
hese must be in upper case.
<br
/><br
/>
'YZX', 'ZXY', 'XZY', 'YXZ' and 'ZYX'.
T
hese must be in upper case.
<br
/><br
/>
If this is changed, [page:.onChangeCallback onChangeCallback] will be called.
Three.js uses
<em>
intrinsic
</em>
(Tait-Bryan) ordering, also known as
<em>
yaw
</em>
,
<em>
pitch
</em>
and
<em>
roll
</em>
. This means that rotations are performed with respect to the
<em>
local
</em>
coordinate system. That is, for order 'XYZ', the rotation is first around world-X, then around
local-Y (which may now be different from the world Y-axis), then local-Z (which may be different
from the world Z-axis).
<br
/><br
/>
Some implementations may use
<em>
extrinsic
</em>
(proper) ordering, in which case rotations are performed
with respect to the
<em>
world
</em>
coordinate system, so that for order 'XYZ', the rotations
are around world-X, world-Y, and world-Z.
<br
/><br
/>
Converting between the two types is relatively straightforward, you just need to reverse the order
and the rotation, so that an intrinsic (three.js) Euler rotation of angles a, b, c about XYZ
will be equivalent to to an extrinsic Euler rotation of angles c, b, a about ZYX.
<br
/><br
/>
If the order is changed, [page:.onChangeCallback onChangeCallback] will be called.
</div>
<h3>
[property:Float x]
</h3>
...
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