D3DXVec2CCW function
Returns the z-component by taking the cross product of two 2D vectors.
Syntax
FLOAT D3DXVec2CCW( _In_ const D3DXVECTOR2 *pV1, _In_ const D3DXVECTOR2 *pV2 );
Parameters
- pV1 [in]
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Type: const D3DXVECTOR2*
Pointer to a source D3DXVECTOR2 structure.
- pV2 [in]
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Type: const D3DXVECTOR2*
Pointer to a source D3DXVECTOR2 structure.
Return value
Type: FLOAT
The z-component.
Remarks
This function determines the z-component by determining the cross-product based on the following formula: ((x1,y1,0) cross (x2,y2,0)). Or as shown in the following example.
pV1->x * pV2->y - pV1->y * pV2->x
If the value of the z-component is positive, the vector V2 is counterclockwise from the vector V1. This information is useful for back-face culling.
Requirements
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See also
Build date: 11/22/2012
