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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]

Type: const D3DXVECTOR2*

Pointer to a source D3DXVECTOR2 structure.

pV2 [in]

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

Header

D3dx9math.h

Library

D3dx9.lib

See also

D3DXVec2Dot

 

 

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