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May 4, 2018 08:06
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Spherical Coordinates Tutorial Expression 2
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float $rate = 3.14 / 2.0; | |
float $theta = offset.translateX * $rate + control.translateX * $rate; | |
float $phi = offset.translateY * $rate - control.translateY * $rate; | |
float $x = sin($theta) * sin($phi); | |
float $y = cos($phi); | |
float $z = cos($theta) * sin($phi); | |
float $px = $x / (1 - $z); | |
float $py = $y / (1 - $z); | |
$px = $px * 0.5; | |
$py = $py * 0.5; | |
$x = (2 * $px) / (1 + pow($px, 2) + pow($py, 2)); | |
$y = (2 * $py) / (1 + pow($px, 2) + pow($py, 2)); | |
$z = (-1 + pow($px, 2) + pow($py, 2)) / (1 + pow($px, 2) + pow($py, 2)); | |
constraint.translateZ = $z; | |
constraint.translateX = $x; | |
constraint.translateY = $y; |
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