TAD handles extrusions directly and easily. Just specify a level and a height; and it will create the desired extrusion.

For complex geometries; you would need to substitute some part of the object or the whole object itself using some special instructions.

Currently, a hip-roof can be created on any volume on the site. Follow the instructions here carefully

1. Say you want to create a hip-roof over an object called “chajja”
2. Firstly, ensure that it is made in anti-clockwise fashion. If you are not sure, you can right-click on that object name in the list of names of objects (usually at the top left of the screen) and then use Remake shape anti-clockwise
3. Now create an outline (let's call it “p”) within the shape of chajja. Say at a distance of -0.25 (Minus, means the outline is created inside the shape) This will become the constructor plane around which the hip-roof would be created for the current object.
4. Make chajja once again the current object. i.e. the helpers should be on that shape
5. To do the next step; ensure that you are able to view the corner number of the shape. To do that, open the program settings (Press Ctrl-Enter inside TAD) and put a check mark on Show current object name on screen checkbox
6. Press F3 or F4 till you are sure that the first helper that is on chajja is indeed on the zeroth corner of that shape
7. Now briefly return back to the outline shape, p, that you had created earlier. The helpers would get shifted on to that shape. Now again press F3/F4 and make sure that the first helper of p is closest to the zeroth corner identified for the chajja. The corner no of p is irrelevant.
8. At this point you are sure that both the shapes chajja and p are aligned and the corners are also in sync
9. Last step: Return the helpers back to chajja i.e. make it the current object by clicking on its name in the top-left list of object names. Make sure that you do not shift the helper to any other corner other than the zeroth
10. Now in the creation dialog, select the “Substitutions” tab. Specify the height you want the hip roof to have
11. Before creating the hip-roof, make sure that Chajja indeed is a 3D shape. i.e. it must be visible in the 3D view
12. Now finally create the hip roof and enjoy!

TAD internally checks if all the inclined faces due to the hip-roof are all in the same 3D plane. If not, it will give a message and not create the hip-plane

Note If the current object and the selction are not made anti-clockwise; and/or if the corner of the constructor plane “p” is not properly synced with the zeroth corner of the object; TAD may contstruct a wrong 3D shape

There are many variations of the hip-roof that can be tried out – just use your imagination!

In future; we will be adding more such substitutions such as arches and domes.