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sel = Application.Selection(0) 
Application.CreatePrim("Grid", "MeshSurface", "", "")
Application.SetValue("grid.Name", "tempGrid", "")
Application.SelectObj("tempGrid", "", True)
Application.AddToSelection(sel, "", True)
Application.Align("", "siY", "siAlignGMIDDLE", "siAlignGMIN", "siAlignGMIDDLE", "siAlignGMIDDLE", "siAlignFMIN", "siAlignGMIDDLE", False)
Application.DeleteObj("tempGrid")

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// Example using an input transform to preserve scaling and rotation
// Works in XSI v10.0 and up

var oSelection = Application.Selection;
for (var oItem = 0; oItem < oSelection.Count; oItem++ ) {
	LogMessage (oSelection(oItem).Name) ;
	oTransform = oSelection(oItem).Kinematics.Local.Transform ;
	// find the bounding box
	var vba = new VBArray( oSelection(oItem).GetBoundingBox(oTransform) );
	var jsa = vba.toArray();
	// Report the min and max
	var minX = jsa[0];
	var minY = jsa[1];
	var minZ = jsa[2];
	var maxX = jsa[3];
	var maxY = jsa[4];
	var maxZ = jsa[5];
	var centerX = (minX + maxX)/2 ;
	var centerY = (minY + maxY)/2 ;
	var centerZ = (minZ + maxZ)/2 ;
	var toGroundY = - minY;
	LogMessage( "min:" + minX + ", " + minY + ", " + minZ ) ;
   LogMessage( "max:" + maxX + ", " + maxY + ", " + maxZ ) ;
	LogMessage( "center:" + centerX + ", " + centerY + ", " + centerZ ) ;
	LogMessage( "toGroundY:" + toGroundY ) ;
	Translate(oSelection(oItem), 0, toGroundY, 0, siAbsolute, siLocal, siObj, siY, null, null, null, null, null, null, null, null, null, 0, null);

}

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// Example using an input transform to preserve scaling and rotation
//

var oSelection = Application.Selection;
for (var oItem = 0; oItem < oSelection.Count; oItem++ ) {
	// Calculate the local transform of the object to take into account the rotation and scaling
	oTransform = oSelection(oItem).Kinematics.Local.Transform ;
	// find the bounding box using X3DObject.GetBoundingBox
	var vba = new VBArray( oSelection(oItem).GetBoundingBox(oTransform) );
	var jsa = vba.toArray();
	// calculate the ground translation to translate the object to ground
	var toGroundY = - jsa[1];
	// Translate the object to ground
	Translate(oSelection(oItem), 0, toGroundY, 0, siAbsolute, siLocal, siObj, siY, null, null, null, null, null, null, null, null, null, 0, null);
}

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/*	Script created by Daniel Brassard (2015)
	This script is a mimic of the Rest On Ground tool in LW
	Modify to your liking if you wish. Cheers!
	This script should work with Softimage v10.0 (2012) and up
*/

//  Rest On Ground

// Create a temporary custom property that will hold the user's choices

   var oPPG = XSIFactory.CreateObject("CustomProperty")
   oPPG.Name = "RestOnGround" ;

   oPPG.AddParameter3( "RestAxis", siString, 1 );
   oPPG.AddParameter3( "CenterX", siBool, true ) ;
   oPPG.AddParameter3( "CenterY", siBool, true );
   oPPG.AddParameter3( "CenterZ", siBool, true );
   oPPG.AddParameter3( "Sense", siString, 1.0 );
   
   oLayout = oPPG.PPGLayout
   
   oLayout.AddGroup();
   oLayout.AddRow();
   aRestAxis = new Array ("X", 0, "Y", 1, "Z", 2 );
   oLayout.AddEnumControl( "RestAxis", aRestAxis, "Rest Axis:", siControlRadio ) ;
   oLayout.EndRow();
	
   oLayout.AddItem( "CenterX", "Center: X Axis" ) ;
   oLayout.AddItem( "CenterY", "Center: Y Axis" ) ;
   oLayout.AddItem( "CenterZ", "Center: Z Axis" ) ;
   
   oLayout.AddRow();
   aSense = new Array ("Above +", 1.0 , "Below -", -1.0 );
   oLayout.AddEnumControl( "Sense", aSense, "Sense:", siControlRadio );
   oLayout.EndRow();
  
   oLayout.EndGroup();
   
   oLayout.AddRow();
   oLayout.AddButton( "OK", "OK") ;
   oLayout.AddButton( "Cancel", "Cancel");
   oLayout.EndRow();
   
   oLayout.Logic = OK_OnClicked.toString() + Cancel_OnClicked.toString() ;
   oLayout.Language = "JScript" ;
   
   InspectObj( oPPG,null,"Rest On Ground" );
   
   function OK_OnClicked()
   {
        
			Logmessage ( RestAxis.value );
               // Here a real plug-in would actually
               // do the calculation
               
               // Destroy the Custom Property (optional)
               DeleteObj( PPG.Inspected ) ;
               PPG.Close() ;
			return;
   }
   
   function Cancel_OnClicked()
   {
        
			Logmessage ( "Cancelled by User" );
               // Destroy the Custom Property (optional)
               DeleteObj( PPG.Inspected ) ;
               PPG.Close() ;
			return;
   }

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// Example using an input transform to preserve scaling and rotation
//

var oSelection = Application.Selection;
for (var oItem = 0; oItem < oSelection.Count; oItem++ ) {
   // Calculate the local transform of the object to take into account the rotation and scaling
   oTransform = oSelection(oItem).Kinematics.Local.Transform ;
   // find the bounding box using X3DObject.GetBoundingBox
   var vba = new VBArray( oSelection(oItem).GetBoundingBox(oTransform) );
   var jsa = vba.toArray();
   // calculate the ground translation to translate the object to ground
   var toGroundY = - jsa[1];
   // Translate the object to ground
   Translate(oSelected(oItem), 0, toGroundY, 0, siAbsolute, siLocal, siObj, siXYZ, null, null, null, null, null, null, null, null, null, 0, null);
}

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var vba = new VBArray( oSelection(oItem).GetBoundingBox(oTransform) );