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ada626d0
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three.js
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ada626d0
编写于
3月 14, 2018
作者:
W
WestLangley
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examples/js/utils/MathUtils.js
examples/js/utils/MathUtils.js
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examples/js/utils/MathUtils.js
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/**
* @author WestLangley
* @author thezwap
* @author WestLangley
/ http://github.com/WestLangley
* @author thezwap
/ http://github.com/thezwap
*/
THREE
.
MathUtils
=
{
setQuaternionFromProperEuler
:
function
(
q
,
a
,
b
,
c
,
order
)
{
var
cos
=
Math
.
cos
;
var
sin
=
Math
.
sin
;
setQuaternionFromProperEuler
:
function
(
q
,
a
,
b
,
c
,
order
)
{
var
c2
=
cos
(
b
/
2
);
// Intrinsic Proper Euler Angles - see https://en.wikipedia.org/wiki/Euler_angles
var
s2
=
sin
(
b
/
2
);
// rotations are applied to the axes in the order specified by 'order'
// rotation by angle 'a' is applied first, then by angle 'b', then by angle 'c'
// angles are in radians
var
c
13
=
cos
((
a
+
c
)
/
2
)
;
var
s
13
=
sin
((
a
+
c
)
/
2
)
;
var
c
os
=
Math
.
cos
;
var
s
in
=
Math
.
sin
;
var
c
1_3
=
cos
((
a
-
c
)
/
2
);
var
s
1_3
=
sin
((
a
-
c
)
/
2
);
var
c
2
=
cos
(
b
/
2
);
var
s
2
=
sin
(
b
/
2
);
var
c
3_1
=
cos
((
c
-
a
)
/
2
);
var
s
3_1
=
sin
((
c
-
a
)
/
2
);
var
c
13
=
cos
(
(
a
+
c
)
/
2
);
var
s
13
=
sin
(
(
a
+
c
)
/
2
);
if
(
order
===
'
XYX
'
)
{
var
c1_3
=
cos
(
(
a
-
c
)
/
2
);
var
s1_3
=
sin
(
(
a
-
c
)
/
2
);
q
.
set
(
c2
*
s13
,
s2
*
c1_3
,
s2
*
s1_3
,
c2
*
c13
);
var
c3_1
=
cos
(
(
c
-
a
)
/
2
);
var
s3_1
=
sin
(
(
c
-
a
)
/
2
);
}
else
if
(
order
===
'
YZY
'
)
{
if
(
order
===
'
XYX
'
)
{
q
.
set
(
s2
*
s1_3
,
c2
*
s13
,
s2
*
c1_3
,
c2
*
c13
);
q
.
set
(
c2
*
s13
,
s2
*
c1_3
,
s2
*
s1_3
,
c2
*
c13
);
}
else
if
(
order
===
'
ZXZ
'
)
{
}
else
if
(
order
===
'
YZY
'
)
{
q
.
set
(
s2
*
c1_3
,
s2
*
s1_3
,
c2
*
s13
,
c2
*
c13
);
q
.
set
(
s2
*
s1_3
,
c2
*
s13
,
s2
*
c1_3
,
c2
*
c13
);
}
else
if
(
order
===
'
XZX
'
)
{
}
else
if
(
order
===
'
ZXZ
'
)
{
q
.
set
(
c2
*
s13
,
s2
*
s3_1
,
s2
*
c3_1
,
c2
*
c13
);
q
.
set
(
s2
*
c1_3
,
s2
*
s1_3
,
c2
*
s13
,
c2
*
c13
);
}
else
if
(
order
===
'
YXY
'
)
{
}
else
if
(
order
===
'
XZX
'
)
{
q
.
set
(
s2
*
c3_1
,
c2
*
s13
,
s2
*
s3_1
,
c2
*
c13
);
q
.
set
(
c2
*
s13
,
s2
*
s3_1
,
s2
*
c3_1
,
c2
*
c13
);
}
else
if
(
order
===
'
ZYZ
'
)
{
}
else
if
(
order
===
'
YXY
'
)
{
q
.
set
(
s2
*
s3_1
,
s2
*
c3_1
,
c2
*
s13
,
c2
*
c13
);
q
.
set
(
s2
*
c3_1
,
c2
*
s13
,
s2
*
s3_1
,
c2
*
c13
);
}
}
else
if
(
order
===
'
ZYZ
'
)
{
q
.
set
(
s2
*
s3_1
,
s2
*
c3_1
,
c2
*
s13
,
c2
*
c13
);
else
{
}
else
{
console
.
warn
(
'
THREE.MathUtils: .setQuaternionFromProperEuler() encountered an unknown order.
'
);
console
.
warn
(
'
THREE.MathUtils: .setQuaternionFromProperEuler() encountered an unknown order.
'
);
}
}
}
\ No newline at end of file
};
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