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| public func Cross(_ q1: SCNQuaternion, _ q2: SCNQuaternion) -> SCNQuaternion { | |
| return SCNQuaternion( | |
| q1.w * q2.x + q1.x * q2.w + q1.y * q2.z - q1.z * q2.y, | |
| q1.w * q2.y - q1.x * q2.z + q1.y * q2.w + q1.z * q2.x, | |
| q1.w * q2.z + q1.x * q2.y - q1.y * q2.x + q1.z * q2.w, | |
| q1.w * q2.w - q1.x * q2.x - q1.y * q2.y - q1.z * q2.z | |
| ) | |
| } |
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