Draw in the direction that you want your terrain to be.
How to make sloping roof in sketchup.
This creates two triangular faces.
Draw two edges from the top of your vertical line to the corners of your roof.
In this screenshot you will see very light green points on the green axis.
Watch this tutorial to find out how to make a basic roof in google sketchup the easy to use 3d modelling tool.
If you did it right you will see some funky structures on your roof.
Use the line tool to draw a vertical edge from the midpoint of your roof to the angled guide you created in step 2.
Easily creates roofs with various parameters in sketchup plugin name.
This sketchup tutorial is show you how to make realistif roof check it out.
This will create the roof over the structure to include the eaves.
Click on the end point of where you want it to be.
Draw two edges from the top of your vertical line to the corners of your roof.
Erase the vertical edge you drew in step 3 and the guide you drew in step 2.
Its easy in sketchup to create a sloped roof over a rectangular floor but creating a slope that is at an arbitrary angle or creating a slope over a more complex floor shape can be tougher.
Push pull back your triangular gable.
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The point at which your edge and your guide meet is the height of your roof ridge.
Use the line tool to draw a vertical edge from the midpoint of your roof to the angled guide you created in step 2.