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The next steps of this tutorial deal with creating the roof built up out of
some rafters and the roof covering.
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We will start in the plan view constructing a line that marks the vertical middle axis
of the building. Draw a Y-Line with the start point in the lower region
by using the Construction of middle points -function.
(As we did it in the profile example.)
Position the end point by snapping-to the upper right corner point of the
walls and move that point upwards "Y+: 0.25" and confirm this.
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Now, we will enter a Cuboid in the plan view and edit it by moving points in a way that
it ends up forming the inclined plane of the roof.
So, you snap-to the upper point of the middle axis. The 2nd Corner point
works out like this: Snap-to the lower right corner of the right vertical
wall and move it "X+: 0.25" and "Y-: 0.25" - and
confirm this. The base of the element is 2.50 m and the height is
0.25 m.
Now, we have defined the region of the roof in the plan view including the
roof overhang. Have a look at it in an isometric view.
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Change into the elevation view now. There, we want to transform the horizontal lying cuboid
in order to achieve the inclined plane of the roof. We will move the inner points of
the cuboid upwards to the ridge. Choose the Move -function in the Edit menu.
Then, select the type -Point and activate those two points of the cuboid that
are situated beneath the ridge. In fact, all four points are activated, because in
this view all points that lie exactly behind the points in front are activated as well.
So, confirm your selection and move the points "Z+ 1.59". (For "Z+"
use the cursor up key or the Z -key.) The height of 1.59m was calculated like this:
tan 30° x (5.50m/2)=1.59m - you also could have constructed this in a separate 2D
section and gauge the height of the ridge.
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At this moment, one side of the roof has the correct form, so it is a good idea to
mirror and copy that element to the other side. The mirror axis is the vertical axis
we used before. Return to the plan view, enter the Edit menu, select
Mirror with the + -button active. Select the right side of the roof,
finish your selection and enter those two points of the mirror axis.
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Viewing the result at this stage in an isometric view, you can see the simple
simulation of a roof. The next steps would be to add the roof covering, form some
rafters, etc. Therefore, enter a section view.
Maybe, start with the roof covering. This could be created by making a copy of the
current roof-cuboid on top of itself. Out of this copy, you can form the roof covering
by moving the upper or lower points up or down. Now, you can assign a material
display the covering. (Do this in the 3D menu, Material, -Alter.)
And, while editing those elements you could assign a different pen color in
order to have a better overview on your 3D elements.
Now, some hints how to create the rafters. For the rafters will lie directly underneath
the roof covering (viewed at it in the plan view), it is a good idea to move the
covering away temporarily. Maybe, you move the covering 10 m aside.
The rafters can be formed out of the initial roof elements now. Enter the plan
view and move the points together in a way that the rafters have a thickness
of e.g. 14 cm. After that, copy those rafters that they are distributed evenly.
Finally, check if the rafters have been assigned the desired material and move
the roof covering back on top of the building. Surely, you can continue adding eave plates
or whatever is necessary.
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