Re: Help with Expression

[Kai Wolter <xsi(at)kaipirinha.com>]

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




---
Unsubscribe? Mail Majordomo(at)Softimage.COM with the following text in body:
unsubscribe xsi