XMVector4Reflect function (directxmath.h)

Reflects an incident 4D vector across a 4D normal vector.

Syntax

XMVECTOR XM_CALLCONV XMVector4Reflect(
  [in] FXMVECTOR Incident,
  [in] FXMVECTOR Normal
) noexcept;

Parameters

[in] Incident

4D incident vector to reflect.

[in] Normal

4D normal vector to reflect the incident vector across.

Return value

Returns the reflected incident angle.

Remarks

The following pseudocode demonstrates the operation of the function:

XMVECTOR Result;

float s = 2.0f * dot(Incident, Normal);

Result.x = Incident.x - s * Normal.x;
Result.y = Incident.y - s * Normal.y;
Result.z = Incident.z - s * Normal.z;
Result.w = Incident.w - s * Normal.w;

return Result;

Platform Requirements

Requirements

See also

DirectXMath Library 4D Vector Geometric Functions