Ok I'm still playing with this tool and have found good solutions to some other difficult roof layout problems. (ok I also got some inside tips from the creator).
(Click here for all Roof Object related posts)
Rising (Falling) Eave (Sergej's tip)
Think of a barn roof with an angle sliced off and you still want the roof to look as though it's on a square footprint. You don't want the odd angled wall to affect the ridge line and it's not obvious how! Here's a very simple work around. Have a very small straight edge before the raking eave! You can make the straight edge so small it won't appear even if dimensioned but it will still get you the effect of what you want if it has the roof pitch. In fact you can use the trim command on a squared off roof which will automatically set the angled edge to 90 and it will work (Just make sure to leave a tiny portion straight. How easy was that !!! Slabs peh!
Constant Ridge Line
This is one that I have recently discovered because Sergej asked me how long it would take to do this with the ACA roof object. He can do it very quickly in his Spirit's roof tool. First let's look at a simple example. By setting the recessed edge to a 90d slope it no longer influences the ridge line and we get our straight ridge.
But if we have another edge it no longer works so what can we do. You may have tried to guess a height and been frustrated that you just can't quite get the exact height required to heal the ridge line and an undesired line appears in your plan view.
Well here's another use for my Trim trick. Draw a line across in plan view from your inset roof position and using your snaps draw a diagonal line from where it intersects your main roof and trim the roof. In isometric view you can now use the ID command to get the exact height at this point. NOTE: YOU MUST HAVE UNITS SET TO MAXIMUM accuracy to get this to work.
Copy the z number from the command line to your clipboard using Control C. Now undo (control Z) the unwanted trim restoring your roof and then select the difficult edge. Pasting your z height into the edge height and restoring the pitch if necessary and your ridge line will be whole again. Wow! That was easy too! Too Easy! And you thought slabs were necessary!
(Tip: If your roof object elevation is other than 0, you may need to add that to the z number to get it's height correct)
Here's ACA roof objects (3) of the original roof picture that Sergej sent me thinking it would take a long time to produce with his ADT1 roof object but it's cleverer that he thought! Using the above trick for the difficult 2nd edge on the same slope and the trim command I had completed it within minutes of him sending the photo.
Hole in One
No not golf! When people ask how to create a hole they may be asking several things. Here's some tips for creating holes in different circumstances.
I will deal with this one in a separate post but there is a solution using the roof object that may suit your situation.
Wrap around verandah.
Let's say you have a colonial house with a verandah all around. Is there a roof object solution? Well I've surprised Sergej with this one and he calls it a bug but it does work. Add a 2nd pitch to just one edge at 0d and the centre disappears. Ok you will need to experiment to get the right height (maybe use the trim and ID command??)
Try it with a round roof!
Also try a double slope roof and set the 2nd slope to 90d. (This is Sergej's official solution!). mmm.... that might be a simpler solution!
How about a central open hole as in a chinese courtyard. I haven't found a way yet but you can wrap your roof mostly around the yard and finish each end very close together to give the appearance of there being a hole in the centre. The point about doing it on a corner is there is already a line there and an extra line slightly apart will be invisible.
Well hopefully again I have challenged your view of the limitations of the ACA/ADT roof object. Yes it does have them but they are probably a lot further down the track than you have been given to believe.
Why would use the roof object over slabs? Well it heals itself as you stretch prod & alter the shape. That's got to be a good idea. In my work on putting units on tight sites I am constantly stretching and moving portions around and to have the roof just 'deal with it' is great. I hope to post some competent solutions to dressing off your roof both for rendering and elevations in the future as well as just maybe some more tips so come back.