Talk:Rotation - Revision history

Kadah Coba: Fixed script tags

2022-03-21T07:15:24Z

Fixed script tags

← Older revision		Revision as of 00:15, 21 March 2022
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	Pending fulfillment of my promise to pay Jesrad L$5000 -- and [http://wiki.secondlife.com/w/index.php?title=Rotation&diff=220643&oldid=167253 Mephistopheles Thalheimer can attest I keep my word on these bounty payments] -- could someone please independently verify that this function works as it should?		Pending fulfillment of my promise to pay Jesrad L$5000 -- and [http://wiki.secondlife.com/w/index.php?title=Rotation&diff=220643&oldid=167253 Mephistopheles Thalheimer can attest I keep my word on these bounty payments] -- could someone please independently verify that this function works as it should?

	<~~lsl~~>// Constrain a rotation to a given plane, defined by its normal, this is very useful for vehicles that remain horizontal in turns:		<source lang="lsl2">// Constrain a rotation to a given plane, defined by its normal, this is very useful for vehicles that remain horizontal in turns:
	rotation ConstrainQuat2Plane(rotation source, vector normal)		rotation ConstrainQuat2Plane(rotation source, vector normal)
	{		{
	return llAxisAngle2Rot(normal, <source.x, source.y, source.z> * normal * llRot2Angle(source));		return llAxisAngle2Rot(normal, <source.x, source.y, source.z> * normal * llRot2Angle(source));
	} // Jesrad Seraph</~~lsl~~>		} // Jesrad Seraph</source>

	I'm very troubled by the use of the first three elements of the quaternion in that manner, but in all honestly, I don't know enough to figure out what a correct answer is. [[User:JS Uralia\|JS Uralia]] 20:43, 23 May 2009 (UTC)		I'm very troubled by the use of the first three elements of the quaternion in that manner, but in all honestly, I don't know enough to figure out what a correct answer is. [[User:JS Uralia\|JS Uralia]] 20:43, 23 May 2009 (UTC)
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	([[User:Francoise Eichel\|Francoise Eichel]] 11:11, 22 February 2011 (PST))		([[User:Francoise Eichel\|Francoise Eichel]] 11:11, 22 February 2011 (PST))

	<~~lsl~~>/*		<source lang="lsl2">/*
	Position of Object Rotated Around A Relative Point,		Position of Object Rotated Around A Relative Point,
	from : http://wiki.secondlife.com/wiki/Rotation		from : http://wiki.secondlife.com/wiki/Rotation
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	RotAround( FACING );		RotAround( FACING );
	}		}
	}</~~lsl~~>		}</source>

	:Looks good, two problems:		:Looks good, two problems:
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	:Please check that the following code works, I haven't done extensive tested. -- '''[[User:Strife_Onizuka\|Strife]]''' <sup><small>([[User talk:Strife_Onizuka\|talk]]\|[[Special:Contributions/Strife_Onizuka\|contribs]])</small></sup> 22:22, 22 February 2011 (PST)		:Please check that the following code works, I haven't done extensive tested. -- '''[[User:Strife_Onizuka\|Strife]]''' <sup><small>([[User talk:Strife_Onizuka\|talk]]\|[[Special:Contributions/Strife_Onizuka\|contribs]])</small></sup> 22:22, 22 February 2011 (PST)

	<~~lsl~~>/*		<source lang="lsl2">/*
	Position of Object Rotated Around A Relative Point,		Position of Object Rotated Around A Relative Point,
	from : http://wiki.secondlife.com/wiki/Rotation		from : http://wiki.secondlife.com/wiki/Rotation
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	state on;		state on;
	}		}
	}</~~lsl~~>		}</source>

	== Attached prims: how to get the rotation of the attach point relative to the avatar forward vector ==		== Attached prims: how to get the rotation of the attach point relative to the avatar forward vector ==
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	What rotations do you get for various Euler coordinates? Derived from LSL and the viewer GUI:		What rotations do you get for various Euler coordinates? Derived from LSL and the viewer GUI:
	<~~lsl~~>		<source lang="lsl2">
	default		default
	{ state_entry()		{ state_entry()
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	}		}
	}		}
	</~~lsl~~>		</source>

	{\|		{\|

Oz Linden: Text replacement - "hg.secondlife.com" to "bitbucket.org/lindenlab"

2015-05-01T17:13:08Z

Text replacement - "hg.secondlife.com" to "bitbucket.org/lindenlab"

← Older revision		Revision as of 10:13, 1 May 2015
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	Starting point, the user interface of the object editor panel:		Starting point, the user interface of the object editor panel:

	http://hg.~~secondlife.com~~/viewer-development/src/a126abe30997/indra/newview/llpanelobject.cpp		http://bitbucket.org/lindenlab/viewer-development/src/a126abe30997/indra/newview/llpanelobject.cpp

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	Searching for "onCommitRotation" in same file...		Searching for "onCommitRotation" in same file...

	http://hg.~~secondlife.com~~/viewer-development/src/a126abe30997/indra/newview/llpanelobject.cpp		http://bitbucket.org/lindenlab/viewer-development/src/a126abe30997/indra/newview/llpanelobject.cpp

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	Searching for "sendRotation" in same file...		Searching for "sendRotation" in same file...

	http://hg.~~secondlife.com~~/viewer-development/src/a126abe30997/indra/newview/llpanelobject.cpp		http://bitbucket.org/lindenlab/viewer-development/src/a126abe30997/indra/newview/llpanelobject.cpp

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	---> F32 LLVector3::magVec () const, in file v3math.h		---> F32 LLVector3::magVec () const, in file v3math.h

	http://hg.~~secondlife.com~~/viewer-development/src/a126abe30997/indra/llmath/v3math.h		http://bitbucket.org/lindenlab/viewer-development/src/a126abe30997/indra/llmath/v3math.h

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	Understanding this section is a confusing mess for a non C++ programmer. Which of these is actually used by "rotation.setQuat(new_rot.mV[VX], new_rot.mV[VY], new_rot.mV[VZ]);" ?		Understanding this section is a confusing mess for a non C++ programmer. Which of these is actually used by "rotation.setQuat(new_rot.mV[VX], new_rot.mV[VY], new_rot.mV[VZ]);" ?

	http://hg.~~secondlife.com~~/viewer-development/src/a126abe30997/indra/llmath/llquaternion.h		http://bitbucket.org/lindenlab/viewer-development/src/a126abe30997/indra/llmath/llquaternion.h

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	Overlapping function definitions in the *.cpp:		Overlapping function definitions in the *.cpp:

	http://hg.~~secondlife.com~~/viewer-development/src/a126abe30997/indra/llmath/llquaternion.cpp		http://bitbucket.org/lindenlab/viewer-development/src/a126abe30997/indra/llmath/llquaternion.cpp

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	=== const LLMatrix3& orthogonalize(); ===		=== const LLMatrix3& orthogonalize(); ===

	http://hg.~~secondlife.com~~/viewer-development/src/a126abe30997/indra/llmath/m3math.h		http://bitbucket.org/lindenlab/viewer-development/src/a126abe30997/indra/llmath/m3math.h

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	</pre>		</pre>

	http://hg.~~secondlife.com~~/viewer-development/src/a126abe30997/indra/llmath/m3math.cpp		http://bitbucket.org/lindenlab/viewer-development/src/a126abe30997/indra/llmath/m3math.cpp

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	=== LLMatrix3::quaternion() const ===		=== LLMatrix3::quaternion() const ===

	http://hg.~~secondlife.com~~/viewer-development/src/a126abe30997/indra/llmath/m3math.h		http://bitbucket.org/lindenlab/viewer-development/src/a126abe30997/indra/llmath/m3math.h

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	</pre>		</pre>

	http://hg.~~secondlife.com~~/viewer-development/src/a126abe30997/indra/llmath/m3math.cpp		http://bitbucket.org/lindenlab/viewer-development/src/a126abe30997/indra/llmath/m3math.cpp

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	</pre>		</pre>

	http://hg.~~secondlife.com~~/viewer-development/src/a126abe30997/indra/llmath/v4math.h		http://bitbucket.org/lindenlab/viewer-development/src/a126abe30997/indra/llmath/v4math.h

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Strife Onizuka: /* Adding Rotations */

2014-03-24T00:02:32Z

Adding Rotations

← Older revision		Revision as of 17:02, 23 March 2014
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	:It can give you a halfway rotation, if you're willing to normalize it yourself. You can usually get away without normalizing, if you just want to set. --[[User:Cerise Sorbet\|Cerise Sorbet]]		:It can give you a halfway rotation, if you're willing to normalize it yourself. You can usually get away without normalizing, if you just want to set. --[[User:Cerise Sorbet\|Cerise Sorbet]]
	Adding two rotations makes no sense whatsoever imho [[User:Aleric Inglewood\|Aleric Inglewood]] 08:05, 23 March 2014 (PDT)		Adding two rotations makes no sense whatsoever imho [[User:Aleric Inglewood\|Aleric Inglewood]] 08:05, 23 March 2014 (PDT)

			:Yeah, it's pointless without more functionality. I've asked LL in the past for more in the way of rotation functions and operators (like multiplying/dividing them by a scalar, normalization, etc) but they have never bit. -- '''[[User:Strife_Onizuka\|Strife]]''' <sup><small>([[User talk:Strife_Onizuka\|talk]]\|[[Special:Contributions/Strife_Onizuka\|contribs]])</small></sup> 17:02, 23 March 2014 (PDT)

Aleric Inglewood: /* Adding Rotations */

2014-03-23T15:05:07Z

Adding Rotations

← Older revision		Revision as of 08:05, 23 March 2014
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	Why does LSL allow two rotations to be added together? Does it have any use? [[User:Omei Qunhua\|Omei Qunhua]] 14:05, 22 January 2014 (PST)		Why does LSL allow two rotations to be added together? Does it have any use? [[User:Omei Qunhua\|Omei Qunhua]] 14:05, 22 January 2014 (PST)
	:It can give you a halfway rotation, if you're willing to normalize it yourself. You can usually get away without normalizing, if you just want to set. --[[User:Cerise Sorbet\|Cerise Sorbet]]		:It can give you a halfway rotation, if you're willing to normalize it yourself. You can usually get away without normalizing, if you just want to set. --[[User:Cerise Sorbet\|Cerise Sorbet]]
			Adding two rotations makes no sense whatsoever imho [[User:Aleric Inglewood\|Aleric Inglewood]] 08:05, 23 March 2014 (PDT)

Cerise Sorbet: /* Adding Rotations */

2014-01-22T22:37:15Z

Adding Rotations

← Older revision		Revision as of 15:37, 22 January 2014
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	== Adding Rotations ==		== Adding Rotations ==
	Why does LSL allow two rotations to be added together? Does it have any use? [[User:Omei Qunhua\|Omei Qunhua]] 14:05, 22 January 2014 (PST)		Why does LSL allow two rotations to be added together? Does it have any use? [[User:Omei Qunhua\|Omei Qunhua]] 14:05, 22 January 2014 (PST)
			:It can give you a halfway rotation, if you're willing to normalize it yourself. You can usually get away without normalizing, if you just want to set. --[[User:Cerise Sorbet\|Cerise Sorbet]]

Omei Qunhua: addition query

2014-01-22T22:05:09Z

addition query

← Older revision		Revision as of 15:05, 22 January 2014
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	:I hope this provides enough incite to get you going.		:I hope this provides enough incite to get you going.
	:A word of caution, much of this is going to be dependent on how floating point math works and will be unavoidable. To understand this you will want to familiarize yourself with the workings of floats. -- '''[[User:Strife_Onizuka\|Strife]]''' <sup><small>([[User talk:Strife_Onizuka\|talk]]\|[[Special:Contributions/Strife_Onizuka\|contribs]])</small></sup> 09:50, 9 December 2011 (PST)		:A word of caution, much of this is going to be dependent on how floating point math works and will be unavoidable. To understand this you will want to familiarize yourself with the workings of floats. -- '''[[User:Strife_Onizuka\|Strife]]''' <sup><small>([[User talk:Strife_Onizuka\|talk]]\|[[Special:Contributions/Strife_Onizuka\|contribs]])</small></sup> 09:50, 9 December 2011 (PST)

			== Adding Rotations ==
			Why does LSL allow two rotations to be added together? Does it have any use? [[User:Omei Qunhua\|Omei Qunhua]] 14:05, 22 January 2014 (PST)

Strife Onizuka: /* Viewer UI, object rotation bugs, code analysis */

2011-12-09T17:50:48Z

Viewer UI, object rotation bugs, code analysis

← Older revision		Revision as of 10:50, 9 December 2011
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	No matching function in v4math.cpp so this *.h is the declaration and definition.		No matching function in v4math.cpp so this *.h is the declaration and definition.

			:Ok a quick C/C++ crash course.
			:* To fully explain header files (*.h) would require explaining the architecture of the compiler, which is best to be avoided (as it would rewire more than a paragraph). C is an old language and many of it's features are artifacts of an earlier age's computer limits. One of these quirks is that you can't use a function or type until it has been declared, now you don't need to declare a signature for a function before you define the body of the function, but if you don't you can't have two functions that call each other (function a calls function b which in turn calls function a). Sorting your functions is annoying and time consuming. This is because everything is read top to bottom, until it is encountered the compiler knowns nothing about it, only what has come before. So you are wondering: Why not just do name validation AFTER reading all of the names in, after parsing the files completely? Why would anyone put up with this madness? Answer: It's an artifact left over from when multi-pass processing was impractical. So instead of doing multi-pass processing, they allow you to feed the compiler hints about what is going to come later, to give it a boot strap.
			:* Function names can be overloaded, that is to say, you can have multiple functions with the same names but they need to have different parameters. They aren't redefinitions. This way the compiler can determine which version of the function to call based on what you fed it, how many parameters and their types (For added funzies, implicit typecasting can obscure or break things).
			:I hope this provides enough incite to get you going.
			:A word of caution, much of this is going to be dependent on how floating point math works and will be unavoidable. To understand this you will want to familiarize yourself with the workings of floats. -- '''[[User:Strife_Onizuka\|Strife]]''' <sup><small>([[User talk:Strife_Onizuka\|talk]]\|[[Special:Contributions/Strife_Onizuka\|contribs]])</small></sup> 09:50, 9 December 2011 (PST)

Scalar Tardis: /* Viewer UI, object rotation bugs, code analysis */ new section

2011-12-07T16:52:57Z

Viewer UI, object rotation bugs, code analysis: new section

Show changes

Strife Onizuka: /* Some interesting values */

2011-12-06T18:21:29Z

Some interesting values

← Older revision		Revision as of 11:21, 6 December 2011
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	\| 0 \|\| 0 \|\| -180 \|\| # \|\| 0.000000 \|\| 0.000000 \|\| 1.000000 \|\| 0.000000		\| 0 \|\| 0 \|\| -180 \|\| # \|\| 0.000000 \|\| 0.000000 \|\| 1.000000 \|\| 0.000000
	\|}		\|}

			:Quaternions only need half a 4 dimensional sphere to work, the other half is duplicate so, <0,0,0,1> expresses the same angle as <0,0,0,-1>. Mathematically there is no difference between negative and positive zero, but that doesn't mean negative zero is not without it's use which is why it is supported in the floating point standard. As you can see, by preserving the negative zero, you can get seemingly different values, which are just mirror of the same angle. You may want to read [[Quaternion]]. -- '''[[User:Strife_Onizuka\|Strife]]''' <sup><small>([[User talk:Strife_Onizuka\|talk]]\|[[Special:Contributions/Strife_Onizuka\|contribs]])</small></sup> 10:21, 6 December 2011 (PST)

Scalar Tardis: /* Some interesting values */ new section

2011-12-04T09:04:11Z

Some interesting values: new section

← Older revision		Revision as of 02:04, 4 December 2011
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	Aspects of the article needs to be rewritten since we now have [[PRIM_ROT_LOCAL]] and [[PRIM_POS_LOCAL]]. -- '''[[User:Strife_Onizuka\|Strife]]''' <sup><small>([[User talk:Strife_Onizuka\|talk]]\|[[Special:Contributions/Strife_Onizuka\|contribs]])</small></sup> 12:19, 5 September 2011 (PDT)		Aspects of the article needs to be rewritten since we now have [[PRIM_ROT_LOCAL]] and [[PRIM_POS_LOCAL]]. -- '''[[User:Strife_Onizuka\|Strife]]''' <sup><small>([[User talk:Strife_Onizuka\|talk]]\|[[Special:Contributions/Strife_Onizuka\|contribs]])</small></sup> 12:19, 5 September 2011 (PDT)

			== Some interesting values ==

			What rotations do you get for various Euler coordinates? Derived from LSL and the viewer GUI:
			<lsl>
			default
			{ state_entry()
			{ llSetTimerEvent(1.0); }

			timer()
			{ rotation rot = llGetRot();
			llSetText("My rotation: "
			+ "\n X: " + (string)rot.x
			+ "\n Y: " + (string)rot.y
			+ "\n Z: " + (string)rot.z
			+ "\n S: " + (string)rot.s
			+ "\n \n \n \n \n \n \n \n \n ",
			<1,1,1>,1);
			}
			}
			</lsl>

			{\|
			! colspan=3\| Degrees
			! #
			! colspan=4\| Rotation
			\|-
			! X !! Y !! Z !! # !! X !! Y !! Z !! S
			\|-
			\| colspan="8" \| Starting position:
			\|-
			\| 0 \|\| 0 \|\| 0 \|\| # \|\| 0.000000 \|\| 0.000000 \|\| 0.000000 \|\| 1.000000
			\|-
			\| colspan="8" \| Symmetry mystery
			\|-
			\| 60 \|\| 0 \|\| 0 \|\| # \|\| 0.500000 \|\| 0.000000 \|\| 0.000000 \|\| 0.866025
			\|-
			\| 0 \|\| 60 \|\| 0 \|\| # \|\| 0.000000 \|\| 0.500000 \|\| 0.000000 \|\| 0.866025
			\|-
			\| 0 \|\| 0 \|\| 60 \|\| # \|\| 0.000000 \|\| 0.000000 \|\| 0.500000 \|\| 0.866025
			\|-
			\| 90 \|\| 0 \|\| 0 \|\| # \|\| 0.707107 \|\| 0.000000 \|\| 0.000000 \|\| 0.707107
			\|-
			\| 0 \|\| 90 \|\| 0 \|\| # \|\| 0.000000 \|\| 0.707107 \|\| 0.000000 \|\| 0.707107
			\|-
			\| 0 \|\| 0 \|\| 90 \|\| # \|\| 0.000000 \|\| 0.000000 \|\| 0.707107 \|\| 0.707107
			\|-
			\| 120 \|\| 0 \|\| 0 \|\| # \|\| 0.866025 \|\| 0.000000 \|\| 0.000000 \|\| 0.500000
			\|-
			\| 0 \|\| 120 \|\| 0 \|\| # \|\| 0.000000 \|\| 0.866025 \|\| 0.000000 \|\| 0.500000
			\|-
			\| 0 \|\| 0 \|\| 120 \|\| # \|\| 0.000000 \|\| 0.000000 \|\| 0.866025 \|\| 0.500000
			\|-
			\| colspan=8 \| Negative and positive 0.000000 ?? ...
			\|-
			\| 180 \|\| 0 \|\| 0 \|\| # \|\|-1.000000 \|\| 0.000000 \|\|-0.000000 \|\| 0.000000
			\|-
			\| 0 \|\| 180 \|\| 0 \|\| # \|\|-0.000000 \|\|-1.000000 \|\|-0.000000 \|\| 0.000000
			\|-
			\| 0 \|\| 0 \|\| 180 \|\| # \|\|-0.000000 \|\|-0.000000 \|\|-1.000000 \|\| 0.000000
			\|-
			\| colspan=8 \| Is -180 different from 180? Well, that depends on there being a difference between -0 and 0, above...
			\|-
			\| -180 \|\| 0 \|\| 0 \|\| # \|\| 1.000000 \|\| 0.000000 \|\| 0.000000 \|\| 0.000000
			\|-
			\| 0 \|\| -180 \|\| 0 \|\| # \|\| 0.000000 \|\| 1.000000 \|\| 0.000000 \|\| 0.000000
			\|-
			\| 0 \|\| 0 \|\| -180 \|\| # \|\| 0.000000 \|\| 0.000000 \|\| 1.000000 \|\| 0.000000
			\|}

← Older revision		Revision as of 17:02, 23 March 2014
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	:It can give you a halfway rotation, if you're willing to normalize it yourself. You can usually get away without normalizing, if you just want to set. --[[User:Cerise Sorbet\|Cerise Sorbet]]		:It can give you a halfway rotation, if you're willing to normalize it yourself. You can usually get away without normalizing, if you just want to set. --[[User:Cerise Sorbet\|Cerise Sorbet]]
	Adding two rotations makes no sense whatsoever imho [[User:Aleric Inglewood\|Aleric Inglewood]] 08:05, 23 March 2014 (PDT)		Adding two rotations makes no sense whatsoever imho [[User:Aleric Inglewood\|Aleric Inglewood]] 08:05, 23 March 2014 (PDT)

			:Yeah, it's pointless without more functionality. I've asked LL in the past for more in the way of rotation functions and operators (like multiplying/dividing them by a scalar, normalization, etc) but they have never bit. -- '''[[User:Strife_Onizuka\|Strife]]''' <sup><small>([[User talk:Strife_Onizuka\|talk]]\|[[Special:Contributions/Strife_Onizuka\|contribs]])</small></sup> 17:02, 23 March 2014 (PDT)

← Older revision		Revision as of 08:05, 23 March 2014
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	Why does LSL allow two rotations to be added together? Does it have any use? [[User:Omei Qunhua\|Omei Qunhua]] 14:05, 22 January 2014 (PST)		Why does LSL allow two rotations to be added together? Does it have any use? [[User:Omei Qunhua\|Omei Qunhua]] 14:05, 22 January 2014 (PST)
	:It can give you a halfway rotation, if you're willing to normalize it yourself. You can usually get away without normalizing, if you just want to set. --[[User:Cerise Sorbet\|Cerise Sorbet]]		:It can give you a halfway rotation, if you're willing to normalize it yourself. You can usually get away without normalizing, if you just want to set. --[[User:Cerise Sorbet\|Cerise Sorbet]]
			Adding two rotations makes no sense whatsoever imho [[User:Aleric Inglewood\|Aleric Inglewood]] 08:05, 23 March 2014 (PDT)