| Microsoft DirectX 8.1 (Visual Basic) | 
Returns the length of a 3-D vector.
D3DXVec3Length( _ 
    v As D3DVECTOR) As Single 
The vector's length.
If the function fails, an error is raised and Err.Number can be set to one of the following values.
| D3DERR_INVALIDCALL | 
| D3DERR_OUTOFVIDEOMEMORY | 
For information on trapping errors, see the Microsoft® Visual Basic® Error Handling topic.