You guys could help him instead of being self-entitled assholes. Not like anyone who is in disbelief that he doesn't know what heartlining is can actually shape anything correctly anyways. Assholes.
Try to think of heartlining as bending the track around the train to get the desired result. For example, in Storm Runner on the immelman thingy the track kicks out to the left in this picture to keep the train's rotation on an axis through the center of the train at the rider's heart. This axis is represented by the yellow line in the No Limits editor.
http://www.rcdb.com/2498.htm?p=9611
Most modern rides use this technique. I believe but am not certain that wooden rides do a half ass version of this where the track kicks out but not enough to shift the actual structure. The purpose of heartlining is mostly to kill laterals. Inline rolls without heartlining would hurt.
Here is an example of an inverted coaster doing a barrel roll.
http://www.rcdb.com/1076.htm?p=2359
The turn after the hill does it here:
http://www.rcdb.com/3245.htm?p=14342
Dragster's roll is wonky for this reason:
http://www.rcdb.com/1896.htm?p=5796
Lots of B&M's have this at the top of their drop
http://www.rcdb.com/1549.htm?p=14953
Look at the MCBR here. It turns slightly proximal to the MCBR, but the turn is the right idea.
http://www.rcdb.com/1651.htm?p=7667
Hope that helped a bit.