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以下插值算法参考自wmo，可能有优化余地

线性插值：

r(取值范围 0~1)

v1、v2

v1 * ( 1f – r) + v2 * r

埃尔米特插值：

r、v1、v2、in、out

h1= 2f * r * r * r – 3f  * r * r +1f

h2= -2f * r * r * r + 3f  * r * r

h3= r * r * r – 2f * r * r + r

h4= r * r * r – r * r

v1 * h1 + v2 * h2 + in * h3 + out * h4

贝赛尔曲线插值:

r、v1、v2、in、out

inverseFactor = 1f – r

factorTimesTwo = r * r

inverseFactorTimesTwo = inverseFactor * inverseFactor

h1 = inverseFactorTimesTwo * inverseFactor

h2 = 3f * r * inverseFactorTimesTwo;

h3 = 3f * factorTimesTwo * inverseFactor;

h4 = factorTimesTwo * r

v1 * h1 + v2 * h2 + in * h3 + out * h4

四元数线性插值默认使用slerp函数