Object Model: Geometry.GetBoundingSphere

Geometry.GetBoundingSphere

Introduced

v5.0

Description

Returns the center and radius of a bounding sphere of the Geometry object. If an input transform is specified, it is applied to the Geometry before the bounding sphere is calculated.

C# Syntax

Object Geometry.GetBoundingSphere( siVolumeCenterMethod in_centerMethod, Object in_pXfoObjectToBSphereSpace );

Scripting Syntax

oArray = Geometry.GetBoundingSphere( [Type], [Transform] );

Return Value

1-dimensional Array containing four values: the X, Y and Z coordinates of the center, followed by the radius of the sphere.

Parameters

Parameter	Type	Description
Type	siVolumeCenterMethod	The technique used to calculate the center of the bounding sphere Default Value: siVolumeCenterMethodBBoxCenter
Transform	SITransformation	Transform to be applied to the Geometry before the bounding sphere is calculated

Examples

1. JScript Example

/* 
        Example using no input transform and default center calculation method
*/
// Create and move (rotate and translate) a torus
NewScene( null, false ) ;
var oTorus = ActiveSceneRoot.AddGeometry( "Torus", "MeshSurface" ) ;
SelectObj( oTorus ) ;
Rotate(null, 45, 0, 0, siAbsolute, siPivot, siObj, siX, null, null, null, null, null, null, null, 0, null) ;
Translate(null, 3, 2, 1, siAbsolute, siPivot, siObj, siX, null, null, null, null, null, null, null, null, null, 0, null) ;
// Find the bounding sphere
var vba = new VBArray( oTorus.ActivePrimitive.Geometry.GetBoundingSphere() ) ;
var jsa = vba.toArray() ;
// Report the (local) center and radius
Application.LogMessage( "center:"  + jsa[0] + ", " + jsa[1] + ", " + jsa[2] ) ;
Application.LogMessage( "radius:" + jsa[3] ) ;

2. JScript Example

/* 
        Example using an input transform to preserve scaling and a different center 
        calculation method
*/
// Create and move (rotate and translate) a torus
NewScene( null, false ) ;
var oTorus = ActiveSceneRoot.AddGeometry( "Torus", "MeshSurface" ) ;
SelectObj( oTorus ) ;
Scale(null, 0.5, 0.5, 1, siAbsolute, siGlobal, siObj, siY, null, null, null, null, null, null, null, 0, null) ;
oTransform = oTorus.Kinematics.Local.Transform ;
// Find the bounding sphere
var vba = new VBArray( oTorus.ActivePrimitive.Geometry.GetBoundingSphere( siVolumeCenterMethodCOG, oTransform) ) ;
var jsa = vba.toArray() ;
// Report the (local) center and radius
Application.LogMessage( "center:" + jsa[0] + ", " + jsa[1] + ", " + jsa[2] ) ;
Application.LogMessage( "radius:" + jsa[3] ) ;
// Build a sphere that shows the bounding volume
var oSphere = ActiveSceneRoot.AddPrimitive("Sphere" ) ;
oSphere.radius = jsa[3] ;
oSphere.PosX = jsa[0] ;
oSphere.PosY = jsa[1] ;
oSphere.PosZ = jsa[2] ;