*The following didn't really happen (duh), but it would be nice!*
I fired up my NL2 software to build a coaster that I had in my head. I clicked "new" then chose "Intamin Rocket Coaster" as the type. I chose to have trains of 8 cars, and to have two trains. I placed the cursor at the point where I wanted to start, then right-clicked and chose "Make Station" from the menu. A station track of exactly the right length was created at the cursor point. I decided to go ahead and choose the station building, and picked an elaborate futuristic design, left hand loading, with a zig-zag ramp down to the ground.
That done, I went to the "track" menu and chose "launch". A popup menu asked how fast I wanted the launch to get to, and how many seconds I wanted it to take. I chose (for fun) 200mph and 0.5 seconds. An alert box warned that the G-forces of that sort of launch would be unsafe. I of course had the option of overriding it and making it anyway, but I chose to pick other numbers instead: 100mph in 5 seconds. It created a launch track exactly the right length to achieve this. Now for the top hat element.
I chose "standard track" from the track menu, then "add vertex". I clicked a point and track was added from the end of the launch to the point I just clicked. It curved nicely, but I was afraid of the G-forces, since it looked rather abrupt. I highlighted the section of track I just made and chose "get info" from the segment menu. It showed that the track segment was 68ft long, the train would enter it at 100mph, exit it at 98mph, and the maximum G-force during that segment would be 6.4g. Too much. I left the segment highlighted, then chose "increase size" and slid the slider bar to the right. The segment maintained its ratio, but got larger. I increased the size until the G-force stat was less than 5 (where I wanted it).
On the way up the top hat, I decide to have the train do a 3/4 twist instead of the usual 1/4 twist. I selected "create element" then "heartline twist". I input that the speed going in would be 94mph (which I knew from the 'get info' after I resized the previous segment), and that it would twist 240deg clockwise. Since the previous segment ended with the train travelling vertically, the heartline was created to keep the train travelling in that same direction. After the hearline is created, I highlight that element, click "get info" and double-check that the G-forces are in check. They are.
A couple of clicks makes the hump over the top of the tophat. It doesn't look exactly smooth, though. I highlight the segment and click "Smooth it!". A perfect half-circle over the top of the element is created. I click to see the G-forces and WOAH! The G-forces are not nearly the airtime-laden wonder I imagined, and the speed exiting the segment is "0". The train isn't making it over the top. I resize the element with the slider again, this time going smaller. Pretty soon, there is an exit speed and the G-force rating is -0.8 - nice floaty!
For the 3/4 twist back down the other side, I highlight the first 3/4 twist I made for the trip up the tophat. Then I click "Copy". A menu box comes up and I select "keep current size", "reverse" (to make it go down instead of up), and "mirror" so it will be counter-clockwise. Click "OK" and I have an identical 3/4 twist to the first one, only heading down and spinning in the opposite direction. It is added to the end of my track. A similar set of moves copies the segment that led into the twist up to make a nice pull-out coming down.
Now the fun part: I want my rocket to have a loop. I choose "create element" then "vertical loop". I choose the diameter, the distance between the lead-in and lead-out tracks, and whether it loops right or left. Click and done. Highlighting the loop, I check the G-forces and am happy with it. I think that it would be even nicer if it were a leaning loop, though. While the loop is highlighted, I click "modify element" and "tilt". I love the Tilt feature, especially for helix work, but right now I'm getting loopy. I set my loop to lean at 45deg. Since the editor now has full-on graphics and not just wireframe (although you can opt for wire if you want), I can tell that my loop looks fantastic. There is the small problem of the terrain, however. I had chosen a hilly terrain to begin with and there is a hill right in the way now. No problem. NL2 allows underground tunnels, and everything is automatically tunneled when the track travels below grade. All I have to do is choose the material for the facing of the tunnel. I like a rock face for my tunnels here. I chose wood facing before when I did that cool mine train, but that's another story.
I bust out of the other side of that hill, make a wicked upward helix ("create element", "helix", then check boxes to set the direction, rotation, and height) and a MCBR.
I want to see how it looks with supports, so I click "auto supports". A box pops up saying "Intamin style supports are default with this track style. Is this OK?" I click "no" then choose "B&M style supports" and click "OK". The track is auto-supported as if B&M had designed them. It looks freakish, so I go back and choose "Arrow multi-looper" style supports. That looks freaky, too, but I like it. I click "test ride" and get a full-scale test as if I were in the simulator and can even slow down or speed up the time scale (10%-1000%) to watch the forces and such closely.
I notice that there was some pumping in my tunnel, so I go back and highlight those segments and click "Smooth it!". Done.
When the track is completed, NL2 does a quick check of the entire layout and highlights the segments in green, yellow, or red depending on the maximum G-forces attained on those segments. My whole track is green except for the pull-out of one drop that is red. Forgot to check that one while I was building... no matter. I click that segment, choose "quick fix" and get a menu that says it can be fixed either by raising the bottom of the drop or by lessening the steepness of the drop. I choose to lessen the steepness and it does it with one click.
I save the coaster, then click "Ride". The simulator is part of the editor now and I get a menu before the ride begins. Since I had installed floodlights along the layout while building (they were part of the "scenery" menu and were placed like trees), I choose to ride at night. There's my POV shot, I hear the people in the station, I hear the restraints lower and lock... looking ahead, there is barely visible a huge tophat element and a loop leaning at a 45deg angle, floodlit against a black, starry sky. It's just a matter of seconds now... my heart races and the train screams out of the station. All is well with the No Limits world.