Sweet! Thanks
Yeah sometime it crashes because there's still a bug lurking somewhere in the quadtree behind the terrain.
The way trimming is suppose to work is that it allow to select an area like in the leveling tool but instead of changing the height of all the points (LOWER and HIGHER) to the height of the point you started the selection from. It just bring the points HIGHER than the point down to it. So let's say you create two hills and want to turn them into plateaus you can use the trimming tool, click on a point of the height you want the plateaus to be at. Drag over the two hills and release the click.
But I'm thinking of changing it by using the AOBdev idea of clicking and move the point up or down with the mouse. So that with the levelling / trimming tool, you will just click and drag a selection, release, move it up or down using the mouse, and finally click to lock in the modification. Hopefully that will be a better system.
Having people play your game makes you realize that you "intuitive" controls weren't that intuitive lol.