Mesh.Intersect(Vector3,Vector3,IntersectInformation,IntersectInformation) Method (Microsoft.DirectX.Direct3D)

Article
06/30/2006

Determines whether a ray intersects with a mesh.

Definition

Visual Basic Public Function Intersect( _
    ByVal rayPos As Vector3, _
    ByVal rayDir As Vector3, _
    ByRef closestHit As IntersectInformation, _
    ByRef allHits As IntersectInformation _
) As Boolean

C# public bool Intersect(
    Vector3 rayPos,
    Vector3 rayDir,
    out IntersectInformation closestHit,
    out IntersectInformation allHits
);

C++ public:
bool Intersect(
    Vector3 rayPos,
    Vector3 rayDir,
    [Out] IntersectInformation% closestHit,
    [Out] IntersectInformation% allHits
);

JScript public function Intersect(
    rayPos : Vector3,
    rayDir : Vector3,
    closestHit : IntersectInformation,
    allHits : IntersectInformation
) : boolean;

Parameters

rayPos Microsoft.DirectX.Vector3
A Vector3 structure that specifies the origin coordinate of the ray.

rayDir Microsoft.DirectX.Vector3
A Vector3 structure that specifies the direction of the ray.

closestHit Microsoft.DirectX.Direct3D.IntersectInformation
An IntersectInformation object that describes the closest intersection between the array and the mesh.

allHits Microsoft.DirectX.Direct3D.IntersectInformation[]
Array of IntersectInformation structures that describe all intersections of the ray and the mesh.

Return Value

System.Boolean
Value that is true if the ray intersects a triangular face on the mesh; otherwise, the value is false.

Remarks

The Intersect method provides a way to understand points in and around a triangle, independent of where the triangle is actually located. This method returns the resulting point by using the following equation:

V1 + U(V2-V1) + V(V3-V1)

Any point in the plane V1V2V3 can be represented by the barycentric coordinate (U,V). The U parameter controls how much V2 gets weighted into the result, and the V parameter controls how much V3 gets weighted into the result. Lastly, 1-U-V controls how much V1 gets weighted into the result.

Barycentric coordinates are a form of general coordinates. In this context, using them represents a change in coordinate systems. What holds true for Cartesian coordinates also holds true for barycentric coordinates.

Exceptions

InvalidCallException

The method call is invalid. For example, a method's parameter might contain an invalid value.

OutOfMemoryException Leave Site

Microsoft Direct3D could not allocate sufficient memory to complete the call.

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Mesh.Intersect(Vector3,Vector3,IntersectInformation,IntersectInformation) Method (Microsoft.DirectX.Direct3D)

Additional resources

Visual Basic	Public Function Intersect( _ ByVal rayPos As Vector3, _ ByVal rayDir As Vector3, _ ByRef closestHit As IntersectInformation, _ ByRef allHits As IntersectInformation _ ) As Boolean
C#	public bool Intersect( Vector3 rayPos, Vector3 rayDir, out IntersectInformation closestHit, out IntersectInformation allHits );
C++	public: bool Intersect( Vector3 rayPos, Vector3 rayDir, [Out] IntersectInformation% closestHit, [Out] IntersectInformation% allHits );
JScript	public function Intersect( rayPos : Vector3, rayDir : Vector3, closestHit : IntersectInformation, allHits : IntersectInformation ) : boolean;

rayPos	Microsoft.DirectX.Vector3 A Vector3 structure that specifies the origin coordinate of the ray.
rayDir	Microsoft.DirectX.Vector3 A Vector3 structure that specifies the direction of the ray.
closestHit	Microsoft.DirectX.Direct3D.IntersectInformation An IntersectInformation object that describes the closest intersection between the array and the mesh.
allHits	Microsoft.DirectX.Direct3D.IntersectInformation[] Array of IntersectInformation structures that describe all intersections of the ray and the mesh.