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<p class=MsoNormal><span style='color:#1F497D'>Bumpity Bump. If I don’t hear
any comments on this, I’m going to assume the proposal is sound and have carte
blanche to break OpenSim at my whim. ;) <o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>(find the original post for the
attachment.)<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Regards,<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Adam<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
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<p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:
"Tahoma","sans-serif"'>From:</span></b><span lang=EN-US style='font-size:10.0pt;
font-family:"Tahoma","sans-serif"'> opensim-dev-bounces@lists.berlios.de
[mailto:opensim-dev-bounces@lists.berlios.de] <b>On Behalf Of </b>Frisby, Adam<br>
<b>Sent:</b> Friday, 11 December 2009 3:48 AM<br>
<b>To:</b> opensim-dev@lists.berlios.de<br>
<b>Subject:</b> [Opensim-dev] Refactoring SceneObjectGroup - Introducing
Components<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Hi Folks,<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I’ve got a fairly complicated proposal to deliver here today
– the short of it is; I’d like to go ahead and replace the current Scene Object
representation model – at a fairly comprehensive & complete level. Some of
you have had the misfortune of working with SceneObjectPart/SceneObjectGroup
and should understand what I am talking about.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>There are several stages to this proposal – but I would like
to talk about today the first big one (and a small outline of the larger
project – the reason for this being some of the later details require a little
more nutting out before I have a complete proposal for them).<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>So – the larger proposal in a nutshell; I would like to:<o:p></o:p></p>
<p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l1 level1 lfo2'><![if !supportLists]><span
style='font-family:Symbol'><span style='mso-list:Ignore'>·<span
style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]>Merge SceneObjectGroup & SceneObjectPart<o:p></o:p></p>
<p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l1 level1 lfo2'><![if !supportLists]><span
style='font-family:Symbol'><span style='mso-list:Ignore'>·<span
style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]>Enable full inheritance & linking (ie,
hierarchical linking)<o:p></o:p></p>
<p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l1 level1 lfo2'><![if !supportLists]><span
style='font-family:Symbol'><span style='mso-list:Ignore'>·<span
style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]>Make programming with SceneObjects possible
& reasonable from the outside (ie have a clean API).<o:p></o:p></p>
<p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l1 level1 lfo2'><![if !supportLists]><span
style='font-family:Symbol'><span style='mso-list:Ignore'>·<span
style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]>Provide the ability to extend SceneObjects with
“components” to introduce new properties and behaviours.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>The item I’d like to talk about today would be implementing
Components. Components are small C# classes that may be attached to any
SceneObject arbitrarily. <o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>A component is any class inheriting from IComponent –
IComponent carries only two properties; a serialisation property (returns the
current ‘state’ for serialisation purposes), and a type property (which
recognises the ‘type’ of component that it is) – components allow you to attach
arbitrary data to an object for the purposes of interacting with a region
module. For instance, a “Mesh” module (which is my current best example) would
have a MeshComponent that included all the extra data to tag an object with
related to meshes – which would get serialised and passed around with the main
object. When deserialized – a “Factory” handles making sure the MeshComponent
is deserialized with the main object.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I’ve attached a document which is my current state of the
whole proposal which includes some examples & more detail. Please note that
Phase 2 is not finalised yet – and some decisions were discussed about changing
two facets in particular.<o:p></o:p></p>
<p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo4'><![if !supportLists]><span
style='font-family:Symbol'><span style='mso-list:Ignore'>·<span
style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]>Enabling inheritance of components+sceneobject
to make speedy-classes for common use cases (eg PrimObject inherits
PrimComponent and SceneObject)<o:p></o:p></p>
<p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo4'><![if !supportLists]><span
style='font-family:Symbol'><span style='mso-list:Ignore'>·<span
style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]>Allowing more than one factory potentially; for
manufacturing said speedy-classes.<o:p></o:p></p>
<p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo4'><![if !supportLists]><span
style='font-family:Symbol'><span style='mso-list:Ignore'>·<span
style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]>Note that these shorthand classes would still
use the standard .Has / .Get methods; they would just return ‘this’ where the
particular component type is concerned.<o:p></o:p></p>
<p class=MsoNormal> <o:p></o:p></p>
<p class=MsoNormal>To begin with – I would like to implement components as an
extra non-serialised property of the SceneObjectPart; this will occur very
shortly after 0.7 is tagged; which I would like to do once ROBUST covers all
the main services (I heard something about late-december/early-jan); this first
stage should not break anything in particular – however once that Is complete,
I would like to migrate properties into components in order to modularised the
codebase better.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>An example of this would be PrimData – primdata is unique to
the Second Life use case, and irrelevant to others; in this case, we’ll move
PrimData into a commonly accessed component (eg
“SceneObject.Get<PrimData>.Hollow = 0.9f;”) – once the move to components
is complete for the common data; then creating the final SceneObject class
which merges SceneObjectGroup+Part should be a fairly painless process.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Please take a read of the document attached for more
information – and I am very keen to hear anyones thoughts as to use cases that
this model will make more difficult; or could not support. The goal with this
project is to make OpenSim support more with less – allowing third party
modules to really take OpenSim as a framework to the next level; and make a
more modular server for other clients & platforms.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Thanks!<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Adam<o:p></o:p></p>
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