/// <summary>
///
/// </summary>
public override void ComputeBoundingSphere()
{
var box = new Box3();
if (this.BoundingSphere == null)
{
this.BoundingSphere = new Sphere();
}
var bufferAttribute = this.Attributes["position"] as BufferAttribute<float>;
Debug.Assert(null != bufferAttribute);
var positions = bufferAttribute.Array;
if (null != positions)
{
box.MakeEmpty();
var center = this.BoundingSphere.Center;
for ( var i = 0; i < positions.Length; i += 3 )
{
var vector = new Vector3(positions[i], positions[i + 1], positions[i + 2]);
box.ExpandByPoint(vector);
}
box.Center(center);
// hoping to find a boundingSphere with a radius smaller than the
// boundingSphere of the boundingBox: sqrt(3) smaller in the best case
var maxRadiusSq = float.NegativeInfinity;
for ( var i = 0; i < positions.Length; i += 3 )
{
var vector = new Vector3(positions[i], positions[i + 1], positions[i + 2]);
maxRadiusSq = Math.Max(maxRadiusSq, center.DistanceToSquared(vector));
}
this.BoundingSphere.Radius = (float)Math.Sqrt(maxRadiusSq);
//if ()
//{
// Trace.TraceError( "BufferGeometry.computeBoundingSphere(): Computed radius is NaN. The 'position' attribute is likely to have NaN values." );
//}
}
}