Second Life Forums Archive - Drift on rotation

Gotty McArdle

Registered User

Join date: 28 May 2006

Posts: 10

01-08-2010 14:58

Hi all,

I'm trying to spin a linkset around the root prim's local z-axis using llTargetOmega. It's fine as long as the linkset is aligned to the world's axis but it failed when set to another rotation. So, after a bit of research I found a possible cure:

axis = axis * llGetLocalRot();
llTargetOmega( axis, spinrate, gain );

A rather unpleasant side-effect was that the entire linkset then begins to 'wobble' as it rotates - as if another small rotation has been applied.

So, the question is; how do I resolve this problem and keep smooth the object spinning smoothly on the one axis?

Thanks in advance!

Gotty

Fenix Eldritch

Mostly harmless

Join date: 30 Jan 2005

Posts: 201

01-08-2010 15:30

is your root prim off center?

Void Singer

Int vSelf = Sing(void);

Join date: 24 Sep 2005

Posts: 6,973

01-08-2010 16:46

the axis formula is right, the wobble are seeing is probably caused by the viewer (maybe only at certain angles?) as it tries to apply that locally.

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Gotty McArdle

Registered User

Join date: 28 May 2006

Posts: 10

01-11-2010 14:31

Spot on, Void!

It certainly seems to be a viewer issue. If the object is left spinning and seemingly moving off-axis and the avatar moves away/to another sim and then returns, the object is back in it's original position.

Thanks for the help

Gotty

Strife Onizuka

Moonchild

Join date: 3 Mar 2004

Posts: 5,887

01-11-2010 14:45

You should file a bug report about this on JIRA.
http://jira.secondlife.com

Objects should not wobble or drift.

_____________________

Truth is a river that is always splitting up into arms that reunite. Islanded between the arms, the inhabitants argue for a lifetime as to which is the main river.
- Cyril Connolly

Without the political will to find common ground, the continual friction of tactic and counter tactic, only creates suspicion and hatred and vengeance, and perpetuates the cycle of violence.
- James Nachtwey

Gotty McArdle

Registered User

Join date: 28 May 2006

Posts: 10

01-15-2010 10:53

JIRA report filed on this issue. Let's see if it's fixable or not. Thanks again all!

Gotty

Nika Talaj

now you see her ...

Join date: 2 Jan 2007

Posts: 5,449

01-15-2010 11:12

Save me a search please Gotty, and post the bug number? I'll vote, I've seen this too.

I'm never terribly confident when scripting rotations, and must have spent 45 minutes the other day banging my head against this.

Gotty McArdle

Registered User

Join date: 28 May 2006

Posts: 10

01-17-2010 03:36

Here's the link for the issue, Nika:

http://jira.secondlife.com/browse/VWR-16629

It's an annoying little bug but needs fixing

Drift on rotation
Gotty McArdle Registered User Join date: 28 May 2006 Posts: 10	01-08-2010 14:58 Hi all, I'm trying to spin a linkset around the root prim's local z-axis using llTargetOmega. It's fine as long as the linkset is aligned to the world's axis but it failed when set to another rotation. So, after a bit of research I found a possible cure: axis = axis * llGetLocalRot(); llTargetOmega( axis, spinrate, gain ); A rather unpleasant side-effect was that the entire linkset then begins to 'wobble' as it rotates - as if another small rotation has been applied. So, the question is; how do I resolve this problem and keep smooth the object spinning smoothly on the one axis? Thanks in advance! Gotty
Fenix Eldritch Mostly harmless Join date: 30 Jan 2005 Posts: 201	01-08-2010 15:30 is your root prim off center?
Void Singer Int vSelf = Sing(void); Join date: 24 Sep 2005 Posts: 6,973	01-08-2010 16:46 the axis formula is right, the wobble are seeing is probably caused by the viewer (maybe only at certain angles?) as it tries to apply that locally. _____________________ \| \| . "Cat-Like Typing Detected" \| . This post may contain errors in logic, spelling, and \| . grammar known to the SL populace to cause confusion \| \| - Please Use PHP tags when posting scripts/code, Thanks. \| - Can't See PHP or URL Tags Correctly? Check Out This Link... \| -
Gotty McArdle Registered User Join date: 28 May 2006 Posts: 10	01-11-2010 14:31 Spot on, Void! It certainly seems to be a viewer issue. If the object is left spinning and seemingly moving off-axis and the avatar moves away/to another sim and then returns, the object is back in it's original position. Thanks for the help Gotty
Strife Onizuka Moonchild Join date: 3 Mar 2004 Posts: 5,887	01-11-2010 14:45 You should file a bug report about this on JIRA. http://jira.secondlife.com Objects should not wobble or drift. _____________________ Truth is a river that is always splitting up into arms that reunite. Islanded between the arms, the inhabitants argue for a lifetime as to which is the main river. - Cyril Connolly Without the political will to find common ground, the continual friction of tactic and counter tactic, only creates suspicion and hatred and vengeance, and perpetuates the cycle of violence. - James Nachtwey
Gotty McArdle Registered User Join date: 28 May 2006 Posts: 10	01-15-2010 10:53 JIRA report filed on this issue. Let's see if it's fixable or not. Thanks again all! Gotty
Nika Talaj now you see her ... Join date: 2 Jan 2007 Posts: 5,449	01-15-2010 11:12 Save me a search please Gotty, and post the bug number? I'll vote, I've seen this too. I'm never terribly confident when scripting rotations, and must have spent 45 minutes the other day banging my head against this.
Gotty McArdle Registered User Join date: 28 May 2006 Posts: 10	01-17-2010 03:36 Here's the link for the issue, Nika: http://jira.secondlife.com/browse/VWR-16629 It's an annoying little bug but needs fixing

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Drift on rotation