public float getHitFraction() {
        return hitFraction;
    }
The hitFraction is the fraction of the ray length (yeah, I know) at which the collision occurred.
If e.g. the ray test was from 0,0,0 to 0,6,0 and the hitFraction is 0.5 then the collision occurred at 0,3,0
@return the hitFraction
jme3-jbullet/src/main/java/com/jme3/bullet/collision/PhysicsRayTestResult.java