| Microsoft DirectX 8.1 (Visual Basic) |
Computes the dot-product of a plane and a 3-D vector. The w parameter of the vector is assumed to be 1.
D3DXPlaneDotCoord( _
P1 As D3DPLANE, _
V As D3DVECTOR) As Single
The dot-product of the plane and 3-D vector.
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.
Given a plane (a, b, c, d) and a 3-D vector (x, y, z) the return value of this function is a*x + b*y + c*z + d*1. The D3DXPlaneDotCoord function is useful for determining the plane's relationship with a coordinate in 3-D space.