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Add quaternion.to_axis_angle
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@ -81,6 +81,14 @@ function slerp(self, other, ratio)
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return modlib.vector.add(modlib.vector.multiply_scalar(self, s_0), modlib.vector.multiply_scalar(other, s_1))
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return modlib.vector.add(modlib.vector.multiply_scalar(self, s_0), modlib.vector.multiply_scalar(other, s_1))
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end
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end
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--> axis, angle
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function to_axis_angle(self)
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local axis = modlib.vector.new{self[1], self[2], self[3]}
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local len = axis:length()
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-- HACK invert axis for correct rotation in Minetest
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return len == 0 and axis or axis:divide_scalar(-len), 2 * math.atan2(len, self[4])
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end
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--> {x = pitch, y = yaw, z = roll} euler rotation in degrees
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--> {x = pitch, y = yaw, z = roll} euler rotation in degrees
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function to_euler_rotation(self)
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function to_euler_rotation(self)
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local rotation = {}
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local rotation = {}
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