wildboar

I have a small function:

bool CanSee(UnitInstance * Me, Vector3& Him)
{
   Vector3 NN1 = Me->Pos - Him;
   Vector3 NN2 = Me->PrevVel;

   NN1.normalize();
   NN2.normalize();

   return(Vector3::dot(NN1, NN2) < 0.0f);
}

This gives me too wide of a field of view check, this is between enemy and player used for stealth system.

How can I make it a lesser FOV?

I have a function like this from recast, its a function that tests if a triangle gets intersected by a ray:

static bool intersectSegmentTriangle(const float* sp, const float* sq,
const float* a, const float* b, const float* c,
float &t)
{
float v, w;
float ab[3], ac[3], qp[3], ap[3], norm[3], e[3];
rcVsub(ab, b, a);
rcVsub(ac, c, a);
rcVsub(qp, sp, sq);


// Compute triangle normal. Can be precalculated or cached if
// intersecting multiple segments against the same triangle
rcVcross(norm, ab, ac);


// Compute denominator d. If d <= 0, segment is parallel to or points
// away from triangle, so exit early
float d = rcVdot(qp, norm);
if (d <= 0.0f) return false;


// Compute intersection t value of pq with plane of triangle. A ray
// intersects iff 0 <= t. Segment intersects iff 0 <= t <= 1. Delay
// dividing by d until intersection has been found to pierce triangle
rcVsub(ap, sp, a);
t = rcVdot(ap, norm);
if (t < 0.0f) return false;
if (t > d) return false; // For segment; exclude this code line for a ray test


// Compute barycentric coordinate components and test if within bounds
rcVcross(e, qp, ap);
v = rcVdot(ac, e);
if (v < 0.0f || v > d) return false;
w = -rcVdot(ab, e);
if (w < 0.0f || v + w > d) return false;


// Segment/ray intersects triangle. Perform delayed division
t /= d;


return true;
}

CIwFMat ConvertToMarmaladeFormat(Matrix4& Mat)

{

	CIwFMat M;

	M.m[0][0] = Mat[0][0];

	M.m[0][1] = Mat[0][1];

	M.m[0][2] = Mat[0][2];

	M.m[1][0] = Mat[1][0];

	M.m[1][1] = Mat[1][1];

	M.m[1][2] = Mat[1][2];

	M.m[2][0] = Mat[2][0];

	M.m[2][1] = Mat[2][1];

	M.m[2][2] = Mat[2][2];

	M.t = CIwFVec3(Mat[3][0], Mat[3][1], Mat[3][2]);

	return M;

}



Matrix4 ConvertFromMarmaladeFormat(CIwFMat& M)

{

	Matrix4 Mat;

	Mat.identity();

	Mat[0][0] = M.m[0][0];

	Mat[0][1] = M.m[0][1];

	Mat[0][2] = M.m[0][2];

	Mat[1][0] = M.m[1][0];

	Mat[1][1] = M.m[1][1];

	Mat[1][2] = M.m[1][2];

	Mat[2][0] = M.m[2][0];

	Mat[2][1] = M.m[2][1];

	Mat[2][2] = M.m[2][2];

	Mat[3][0] = M.t.x;

	Mat[3][1] = M.t.y;

	Mat[3][2] = M.t.z;

	return Mat;

}



class Matrix4

{

	friend Vector4 operator*(const Vector4 &lhs, const Matrix4 &rhs);

	friend Vector3 operator*(const Vector3 &lhs, const Matrix4 &rhs);

	friend Matrix4 operator*(float scalar, const Matrix4 &rhs);

public:

	static const Matrix4 IDENTITY;

	static Matrix4 createFromAxes(const Vector3 &x, const Vector3 &y, const Vector3 &z);

	static Matrix4 createFromAxesTransposed(const Vector3 &x, const Vector3 &y, const Vector3 &z);

	static Matrix4 createFromHeadPitchRoll(float headDegrees, float pitchDegrees, float rollDegrees);

	static Matrix4 createMirror(const Vector3 &planeNormal, const Vector3 &pointOnPlane);

	static Matrix4 createOrient(const Vector3 &from, const Vector3 &to);

	static Matrix4 createRotate(const Vector3 &axis, float degrees);

	static Matrix4 createScale(float sx, float sy, float sz);

	static Matrix4 createTranslate(float tx, float ty, float tz);

	Matrix4() {}

	Matrix4(float m11, float m12, float m13, float m14,

			float m21, float m22, float m23, float m24,

			float m31, float m32, float m33, float m34,

			float m41, float m42, float m43, float m44);

	~Matrix4() {}

	float *operator[](int row);

	const float *operator[](int row) const;

	bool operator==(const Matrix4 &rhs) const;

	bool operator!=(const Matrix4 &rhs) const;

	Matrix4 &operator+=(const Matrix4 &rhs);

	Matrix4 &operator-=(const Matrix4 &rhs);

	Matrix4 &operator*=(const Matrix4 &rhs);

	Matrix4 &operator*=(float scalar);

	Matrix4 &operator/=(float scalar);

	Matrix4 operator+(const Matrix4 &rhs) const;

	Matrix4 operator-(const Matrix4 &rhs) const;

	Matrix4 operator*(const Matrix4 &rhs) const;

	Matrix4 operator*(float scalar) const;

	Matrix4 operator/(float scalar) const;

	float determinant() const;

	void fromAxes(const Vector3 &x, const Vector3 &y, const Vector3 &z);

	void fromAxesTransposed(const Vector3 &x, const Vector3 &y, const Vector3 &z);

	void fromHeadPitchRoll(float headDegrees, float pitchDegrees, float rollDegrees);

	void identity();

	Matrix4 inverse() const;

	void orient(const Vector3 &from, const Vector3 &to);

	void rotate(const Vector3 &axis, float degrees);

	void scale(float sx, float sy, float sz);

	void toAxes(Vector3 &x, Vector3 &y, Vector3 &z) const;

	void toAxesTransposed(Vector3 &x, Vector3 &y, Vector3 &z) const;

	void toHeadPitchRoll(float &headDegrees, float &pitchDegrees, float &rollDegrees) const;

	void translate(float tx, float ty, float tz);

	Matrix4 transpose() const;

private:

	float mtx[4][4];

};



class CIwFMat

{

public:

/**

* 3x3 rotation matrix.

*/

	float   m[3][3];

/**

* Trans vector.

*/

	CIwFVec3	t;

...

};