public static Quaternion LookRotationForcedUp(Quaternion rotation, Vector3 up)
{
Vector3 vector3 = new Vector3();
Vector3 vector31 = new Vector3();
Vector3 vector32 = new Vector3();
Vector3 vector33 = new Vector3();
Vector3 vector34 = new Vector3();
float single = up.x * up.x + up.y * up.y + up.z * up.z;
if (single < 1.401298E-45f)
{
return(rotation);
}
float single1 = TransformHelpers.InvSqrt(single);
up.x = up.x * single1;
up.y = up.y * single1;
up.z = up.z * single1;
vector33.x = up.x;
vector33.y = up.y;
vector33.z = up.z;
float single2 = 1f;
float single3 = single2;
vector34.x = single2;
vector3.z = single3;
float single4 = 0f;
single3 = single4;
vector34.y = single4;
float single5 = single3;
single3 = single5;
vector34.z = single5;
float single6 = single3;
single3 = single6;
vector3.x = single6;
vector3.y = single3;
vector3 = rotation * vector3;
vector34 = rotation * vector34;
float single7 = vector3.x * vector33.x + vector3.y * vector33.y + vector3.z * vector33.z;
float single8 = vector34.x * vector33.x + vector34.y * vector33.y + vector34.z * vector33.z;
if (single7 * single7 <= single8 * single8)
{
vector31.x = vector3.x;
vector31.y = vector3.y;
vector31.z = vector3.z;
}
else
{
vector31.x = vector33.x;
vector31.y = vector33.y;
vector31.z = vector33.z;
vector32.x = vector34.x;
vector32.y = vector34.y;
vector32.z = vector34.z;
vector3.x = -(vector31.y * vector32.z - vector31.z * vector32.y);
vector3.y = -(vector31.z * vector32.x - vector31.x * vector32.z);
vector3.z = -(vector31.x * vector32.y - vector31.y * vector32.x);
float single9 = TransformHelpers.InvSqrt(vector3.x, vector3.y, vector3.z);
vector31.x = single9 * vector3.x;
vector31.y = single9 * vector3.y;
vector31.z = single9 * vector3.z;
}
vector32.x = vector33.x;
vector32.y = vector33.y;
vector32.z = vector33.z;
vector34.x = vector31.y * vector32.z - vector31.z * vector32.y;
vector34.y = vector31.z * vector32.x - vector31.x * vector32.z;
vector34.z = vector31.x * vector32.y - vector31.y * vector32.x;
float single10 = TransformHelpers.InvSqrt(vector34.x, vector34.y, vector34.z);
vector32.x = vector34.x * single10;
vector32.y = vector34.y * single10;
vector32.z = vector34.z * single10;
vector31.x = vector33.x;
vector31.y = vector33.y;
vector31.z = vector33.z;
vector3.x = vector31.y * vector32.z - vector31.z * vector32.y;
vector3.y = vector31.z * vector32.x - vector31.x * vector32.z;
vector3.z = vector31.x * vector32.y - vector31.y * vector32.x;
if (vector3.x * vector3.x + vector3.y * vector3.y + vector3.z * vector3.z < 1.401298E-45f)
{
return(rotation);
}
return(Quaternion.LookRotation(vector3, up));
}