public static Quaternion LookRotationNormal(Vector3 normal, Vector3 up = null)
{
if (up != Vector3.zero)
{
return QuaternionEx.LookRotationForcedUp(up, normal);
}
if (normal == Vector3.up)
{
return QuaternionEx.LookRotationForcedUp(Vector3.forward, normal);
}
if (normal == Vector3.down)
{
return QuaternionEx.LookRotationForcedUp(Vector3.back, normal);
}
if (normal.y == 0f)
{
return QuaternionEx.LookRotationForcedUp(Vector3.up, normal);
}
Vector3 vector3 = Vector3.Cross(normal, Vector3.up);
return QuaternionEx.LookRotationForcedUp(-Vector3.Cross(normal, vector3), normal);
}
public static Quaternion LookRotationGradient(Vector3 normal, Vector3 up)
{
return QuaternionEx.LookRotationForcedUp(Vector3.Cross(normal, (normal == Vector3.up ? Vector3.forward : Vector3.Cross(normal, Vector3.up))), up);
}