TerrainSceneManager: Bad RAY query results + SOLUTION

I figured out that ray scene queries with the Terrain Scene Manager are very imprecise.

The resulting distance to the terrain hit point is upto 1 Ogre Unit larger than the real distance.
So the resulting hit points are at the wrong place. (somewhere below the terrain surface)
Here is a picture of my tests:
Click to enlarge
[attachment=0]Ogre problem - wrong RAY results for terrain.png[/attachment]

Only vertical rays returns the correct distance value.

I started a topic about this bug in the main forum. (here)
There I got answers related to the TSM internal calculation algorithm.

Solution

Based on this information I wrote a method, which perform a distance correction.
It's very easy to embedd into existing Mogre applications.
Just add my correction method and 2 lines of code to each ray query loop.
Then the distance results for terrain are very precise.

My code I published here:
http://www.ogre3d.org/forums/viewtopic. ... 00#p444900

Also I created images which explains how my code calculates the distance correction.

Note:
This problem is only related to the Terrain Scene Manager.
The new terrain component gives precise results. (For other terrain managers I don't know.)