Creates a new 3D vector from a pair of ISO spherical angles.
示例
语法
fromAngles(theta, phi, [length])
参数
theta
Number: polar angle in radians (zero is up).
phi
Number: azimuthal angle in radians (zero is out of the screen).
length
Number: length of the new vector (defaults to 1).
返回值
p5.Vector: new p5.Vector object.
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