Re: [CPP] Storing data in a compileOp

[Guy Rabiller <guy(at)alamaison.fr>]

> ../.. will this data persist between saves? ../..

No. Your class is deleted when the Operator is deleted, so everything 'disappear'.


> ../.. I've been assuming all this time that init is
> called on creation and term on deletion. Is that
> the case or is it called everytime I load up the
> scene as well? ../..

When your load up the scene, the Operators are created by XSI, so you've been assuming right.


> ../.. Was hoping to avoid a blob due to the number
> of simultaneous copies I'll be using of this and I'd like
> to try keep setup as simple as possible ../..

The setup or the coding ? :-)


Just to be sure I understand what you are trying to do:

You have 2 mesh objects, and you want to Constraint one object to the second object, so that one vertice of the Constrained object is at a certain distance and in the normal direction of one vertice of the Constraining object ? Or do I have all wrong ?

Still it's unclear why you would want to call your class/operator methods/functions from outside the operator.
--
guy rabiller | 3d technical director (at) LaMaison


Alan Jones a écrit :

Hi Guy,

Thanks for that - just to check I've followed - I have my operator class and it stays as is - then I just use it to create an pass data through to my other class which has any additional functionality I want?

Seeing this position is the offset I thought I may want to change it to whatever the current difference is. hmmm actually I just realised something - I've been assuming all this time that init is called on creation and term on deletion. Is that the case or is it called everytime I load up the scene as well? i.e. will this data persist between saves?

Cheers,

Alan.

On 12/12/05, Guy Rabiller <guy(at)alamaison.fr > wrote:

> ../.. The data should persist until I
> delete the compiledOperator. ../..

This should be automatic, as long as you use a class for your compiled operator rather than directly using the callbacks.

First create a Class wich has the 3 members Init/Update/Term with similar arguments as of the callbacks.
Then when in the operator Init callback, create a new instance of your class then

CYourClass* pYourInstancePointer = new CYourClass();
inCtx.PutUserData( (CValue::siPtrType)pYourInstancePointer );
pYourInstancePointer->Init(inCtx);

In the Update and Term, retrieve your pointer:

CValue::siPtrType pUserData = in_ctx.GetUserData();
CYourClass* pYourInstancePointer = (CYourClass*)pUserData;

and either
pYourInstancePointer->Term(inCtx)
or
pYourInstancePointer->Update(inCtx, outPort)

Now your Class can contain any public or private members/properties, and it will be persistent until you delete the operator.

> ../..I'm making a customOperator that will be working ../..

I meant why would you want to call the function from outside of your Class/Operator ?

--
guy rabiller | 3d technical director (at) LaMaison

Alan Jones a écrit :

Hi Guy,

The data should persist until I delete the compiledOperator.

I'm making a customOperator that will be working as a constraint and I want to store the initial position of the point being constrained relative to another point (using pointLocatorData and a vector in tangent space) so I want to store both of those pieces during the init function. Then later I was to grab those - check the changed position of the point it's relative to and figure out the new location.

Cheers,

Alan.

On 12/12/05, Guy Rabiller <guy(at)alamaison.fr > wrote:

> ../.. I'd like to store some data (a vector)
> in my compiled op for it to reference later ../..

Define 'later' ?

How 'far' the data(s) should be persistent ?

> ../.. is there a way to call my own functions on the class ../..

Why would you do that ?
--
guy rabiller | 3d technical director (at) LaMaison


Alan Jones a écrit :

> Hi All,
>
> I'd like to store some data (a vector) in my compiled op for it to
> reference later - though I don't want the user to see it.
>
> I've looked at the init function - which seems like a good enough
> place to start, but can't seem to find a nice place to keep it. Is
> adding my own variables to the class going to break anything? or is
> that how I should be doing it?
>
> It might be nice to be able to change it from a command too - is there
> a way to call my own functions on the class if I add them or is
> update, init and term or I can really work within.
>
> Thanks for any help.
>
> Cheers,
>
> Alan.



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