Re: Help with Expression

[Christian Götzinger <cg(at)pension-goetzinger.de>]

Hi,

thanks a lot. It's working like a charm now. Since I'm using nulls as 
parents for my book geometry, I could get away with a much easier script:

// align books in x with a specified distance
function AlignObjectsX(objects, distance)
{
  for (i=0; i<objects.Count-1; i++)
  {
    objects(i+1).Kinematics.Local.Parameters("posx").value = 
objects(i).Kinematics.Local.Parameters("posx").value + 
objects(i).Kinematics.Local.Parameters("sclx").value + distance;  
  }
}

AlignObjectsX(Selection, 0.2);

I also tried to randomize the distance value but couldn't figure out how 
to do it. It's not so important because it won't make a difference, but 
just out of curiosity - how would I do that?
I tried with RAND(0.2, 0.4) but that didn't work.

Thanks a lot for your help,
Chris

Kai Wolter schrieb:

> don't think it works with expressions because you would need them in 
> both directions and that will lead to a circle.
> but i liked the task, so here are a few helper functions:
>
> // align books in x with a specified distance
> function AlignObjectsX(objects, distance)
> {
>    for (i=0; i<objects.Count-1; i++)
>    {
>                                    //xmin, ymin, zmin, xmax, ymax, 
> zmax         col1 = GetBBox (objects(i) , false, null, null, null, 
> null, null, null );
>        col2 = GetBBox (objects(i+1) , false, null, null, null, null, 
> null, null );
>        objects(i+1).Kinematics.Global.Parameters( "posx" ).Value = 
> col1(3) + (col2(3) - col2(0))/2 + distance;
>    }
> }
>
> // align books in y
> function AlignToObjectY(objects, object)
> {
>    col = GetBBox (object, false, null, null, null, null, null, null );
>    for (i=0; i<objects.Count; i++)
>    {
>        col2 = GetBBox (objects(i) , false, null, null, null, null, 
> null, null );
>        objects(i).Kinematics.Global.Parameters( "posy" ).Value = 
> objects(i).Kinematics.Global.Parameters( "posy" ).Value + 
> object.Kinematics.Global.Parameters( "posy" ).Value - (col2(1) - col(1));
>    }
> }
>
> // sample scene
> CreatePrim("Cube", "MeshSurface", null, null);
> Scale(null, 9.47775628626693E-02, 1, 1, siRelative, siLocal, siObj, 
> siXYZ, null, null, null, null, null, null, null, 0);
> Scale(null, 1, 1, 0.720870034294196, siRelative, siLocal, siObj, 
> siXYZ, null, null, null, null, null, null, null, 0);
> Duplicate("cube", null, siDuplicateHistory, siSharedParent, 
> siShareGrouping, siDuplicateProperties, siDuplicateAnimation, 
> siShareConstraints, siSetSelection, siApplyRepeatXForm, null, null, 
> null, null, null, null, null, null, null, null, 
> siDuplicateSelectedTextureSupports);
> Scale(null, 2.08001760680689, 1, 1, siRelative, siLocal, siObj, siXYZ, 
> null, null, null, null, null, null, null, 0);
> Duplicate("cube1", null, siDuplicateHistory, siSharedParent, 
> siShareGrouping, siDuplicateProperties, siDuplicateAnimation, 
> siShareConstraints, siSetSelection, siApplyRepeatXForm, null, null, 
> null, null, null, null, null, null, null, null, 
> siDuplicateSelectedTextureSupports);
> Scale(null, 0.709690205494565, 1, 1, siRelative, siLocal, siObj, 
> siXYZ, null, null, null, null, null, null, null, 0);
> Scale(null, 1, 1.11605415860735, 1, siRelative, siLocal, siObj, siXYZ, 
> null, null, null, null, null, null, null, 0);
> DeleteObj("cube2");
> SelectObj("cube,cube1", null, true);
> SelectObj("cube1", null, true);
> Duplicate("cube1", null, siDuplicateHistory, siSharedParent, 
> siShareGrouping, siDuplicateProperties, siDuplicateAnimation, 
> siShareConstraints, siSetSelection, siApplyRepeatXForm, null, null, 
> null, null, null, null, null, null, null, null, 
> siDuplicateSelectedTextureSupports);
> Scale(null, 1.49986352670082, 1, 1, siRelative, siLocal, siObj, siXYZ, 
> null, null, null, null, null, null, null, 0);
> SelectObj("cube1", null, true);
> Scale(null, 1, 2.29980657640232, 1, siRelative, siLocal, siObj, siXYZ, 
> null, null, null, null, null, null, null, 0);
> SelectObj("cube2", null, true);
> Scale(null, 1, 0.686653771760155, 1, siRelative, siLocal, siObj, 
> siXYZ, null, null, null, null, null, null, null, 0);
> DeselectAll();
> SelectObj("cube", null, null);
> ToggleSelection("cube1", null, null);
> ToggleSelection("cube2", null, null);
>
> AlignObjectsX(Selection, 1.5);
> AlignToObjectY(Selection, Selection(0));
>
>
> Cheers,
> Kai
>
> Christian Götzinger schrieb:
>
> > Hi List,
> >
> > I also posted this on XSIBase but seeing as this mailing list is 
> > probably the best place to get answers to technical questions, here 
> > goes:
> >
> > I'm in the process of creating several bookshelves filled with books.
> >
> > I have created one book which I'm going to duplicate off many times. 
> > Basically, I've parented that one book to a null and I'm using the 
> > null to scale the book up and down. This way I can lateron randomize 
> > the sizes of all my books very easily.
> >
> > Now, what I'd like to do is for XSI to align my books automatically 
> > next to each other.
> > Here's my basic setup:
> >
> > BookP1 (Null) -> Scale X = 5 -- Scale Y = 25 -- Scale Z = 15
> > Child: Book1 (which is the actual book)
> >
> > To test things out I have duplicated the hierarchy to create BookP2 
> > and its child Book2
> >
> > I have set this expression on BookP2's local position X:
> > Valid expression : BookP2.kine.local.posx = 
> > BookP1.kine.local.posx+BookP1.kine.local.sclx
> >
> > This works very well. If I scale BookP1 up in X, the second book gets 
> > aligned automatically.
> >
> > Now my question: how can I generalize this expression so that it'll 
> > be valid for all books once I've mass duplicated them?
> >
> > I'm not into scripting or anything, so this may seem like a piece of 
> > cake to you
> >
> > Thanks,
> > Chris
>
>
>
>
>
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