[ODE] Ray question

[LR]

Hi,
 
I'm using ray to simulate a distance sensor, the ray is from 0 to 5 meters.
 
To determine what is the nearest object, i look in the nearcallback what is
the current detected object, if the distace is less than the last computed
the the "really" near object is the new one ... i think it's the good way
(no ?)
 
Question: 
 
when i find a contact (in the near callback) at (for exemple) 2 meters from
the ray position, is it a good optimisation to change the length of the ray
(using dRaySetLength) to down it to 2 meters ? To avoid detection after  2
meters.
 
 
Laurent.
 
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