mix 函数的描述为 x\times a + (1-a)\times y，但是实际的代码是 x * (1.0 - a) + y * a
这应该算是个笔误？
@ti.func
def mix(x, y, a):
"""Performs a linear interpolation between `x` and `y` using
`a` to weight between them. The return value is computed as
:math:`x\times a + (1-a)\times y`.
The arguments can be scalars or :class:`~taichi.Matrix`,
as long as the operation can be performed.
This function is similar to the `mix` function in GLSL.
Args:
x (:mod:`~taichi.types.primitive_types`, :class:`~taichi.Matrix`): Specify
the start of the range in which to interpolate.
y (:mod:`~taichi.types.primitive_types`, :class:`~taichi.Matrix`): Specify
the end of the range in which to interpolate.
a (:mod:`~taichi.types.primitive_types`, :class:`~taichi.Matrix`): Specify
the weight to use to interpolate between x and y.
Returns:
(:mod:`~taichi.types.primitive_types`, :class:`~taichi.Matrix`): The linear
interpolation of `x` and `y` by weight `a`.
Example::
>>> x = ti.Vector([1, 1, 1])
>>> y = ti.Vector([2, 2, 2])
>>> a = ti.Vector([1, 0, 0])
>>> ti.math.mix(x, y, a)
[2.000000, 1.000000, 1.000000]
>>> x = ti.Matrix([[1, 2], [2, 3]], ti.f32)
>>> y = ti.Matrix([[3, 5], [4, 5]], ti.f32)
>>> a = 0.5
>>> ti.math.mix(x, y, a)
[[2.000000, 3.500000], [3.000000, 4.000000]]
"""
return x * (1.0 - a) + y * a
在API文档中也是相同的描述
https://docs.taichi-lang.org/api/taichi/math/mathimpl/#taichi.math.mathimpl.mix
