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types:rotation [2015-09-22 09:34 SLT] sei Add note on <0,0,0,0> vs <0,0,0,1> and talk about ZERO_ROTATION |
types:rotation [2015-09-22 10:16 SLT] (current) sei change tutorial link to point to articles |
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| <WRAP round info>**IMPORTANT:**\\ | <WRAP round info>**IMPORTANT:**\\ | ||
| - | Please note that this is **NOT** an introductory text on rotations, but a reference on the usage of the rotation type in LSL. If you want to learn on rotations, you may want to check the [[/rotations]] tutorial. | + | Please note that this is **NOT** an introductory text on rotations, but a reference on the usage of the rotation type in LSL. If you want to learn on rotations, you may want to check the $lart[Rotations] tutorial. |
| </WRAP> | </WRAP> | ||
| ===== Rotation type ===== | ===== Rotation type ===== | ||
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| === Inverse of a rotation === | === Inverse of a rotation === | ||
| - | The rotation that cancels a given rotation can be obtained by negating the **s** component. Unfortunately, LSL does not support an operand that does this, so it has to be done by hand. For example: ''<q.x, q.y, q.z, -q.s>'' is the inverse rotation of **q**, or if you want to invert the variable you can do: ''q.s = -q.s;'' | + | The rotation that cancels a given rotation can be obtained by negating the **s** component. Unfortunately, LSL does not support an operator that does this, so it has to be done by hand. For example: ''<q.x, q.y, q.z, -q.s>'' is the inverse rotation of **q**, or if you want to invert the variable you can do: ''q.s = -q.s;'' |
| === Type casting a quaternion === | === Type casting a quaternion === | ||
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| * ''(rotation)rotation_value'' does nothing special to the value, as expected. | * ''(rotation)rotation_value'' does nothing special to the value, as expected. | ||
| * ''(rotation)string_value'' is supported; see $lty[string#Type casting of strings] for details. | * ''(rotation)string_value'' is supported; see $lty[string#Type casting of strings] for details. | ||
| - | * ''(string)rotation_value'' is supported too; see $lty[float#Precision] for details. | + | * ''(string)rotation_value'' is supported too; see $lty[float#Type casting a float to string] for details. |
| * ''(list)rotation_value'' results in a list with one single element of type $ty[rotation]. | * ''(list)rotation_value'' results in a list with one single element of type $ty[rotation]. | ||