public void setSupportMultipleCollisions(boolean set) {
        if (picker == null) {
            throw new IllegalStateException("The TerrainPicker is null.");
        } else if (picker instanceof BresenhamTerrainPicker) {
            ((BresenhamTerrainPicker)picker).setSupportMultipleCollisions(set);
        } else {
            throw new IllegalStateException("The underlying picking implementation does not support multiple collisions");
        }
    }
When colliding with this terrain, is a report of all collisions wanted or only the closest collision?<br>
If only the closest collision is required, the collision calculation will be faster.<br>
Note: If no collision happens, it takes as long as a collision with multipleCollisions on would take.

@param set Whether to support multiple collisions or not
jme3-terrain/src/main/java/com/jme3/terrain/geomipmap/TerrainQuad.java