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How to caluculate normal of plane

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Plane:lane(Vector3 p0, Vector3 p1, Vector3 p2)
{
Vector3 edge0 = p1 - p0;
Vector3 edge1 = p2 - p0;

_normal = edge0.cross(edge1);
_normal.normalize();

_signedDistance = -_normal.dot(p0);
}

ECKILLER

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