/// <summary>
/// Automatically computes bounding box for the specified vertex arrays.
/// </summary>
/// <param name="vertexArrayObject">
///
/// </param>
/// <returns>
/// It returns the <see cref="IBoundingVolume"/> for <paramref name="vertexArrayObject"/>, if possible.
/// </returns>
private static IBoundingVolume ComputeBoundingVolume(VertexArrayObject vertexArrayObject)
{
if (vertexArrayObject == null)
{
throw new ArgumentNullException("vertexArrayObject");
}
VertexArrayObject.IVertexArray vertexArray = vertexArrayObject.GetVertexArray(VertexArraySemantic.Position);
if (vertexArray == null)
{
return(null);
}
ArrayBufferObjectBase positionArray = vertexArray.Array;
Type positionArrayType = positionArray.GetType();
if (positionArrayType == typeof(ArrayBufferObject <Vertex4f>))
{
ArrayBufferObject <Vertex4f> positionArray4f = (ArrayBufferObject <Vertex4f>)positionArray;
Vertex4f min = Vertex4f.Maximum, max = Vertex4f.Minimum;
positionArray4f.MinMax(out min, out max);
return(new BoundingBox((Vertex3f)min, (Vertex3f)max));
}
else if (positionArrayType == typeof(ArrayBufferObject <Vertex3f>))
{
ArrayBufferObject <Vertex3f> positionArray3f = (ArrayBufferObject <Vertex3f>)positionArray;
Vertex3f min = Vertex3f.Maximum, max = Vertex3f.Minimum;
positionArray3f.MinMax(out min, out max);
return(new BoundingBox(min, max));
}
else
{
return(null);
}
}