The other 2 lines the horizontal and vertical line are there to make an imaginary box.
How to draw a roof line.
Create a structure to put the roof on.
If your gabled roof extends all the way to the other end of your building push pull it back that far.
This finishes of the roof line.
Click and drag from one corner of the wall top to the other.
To finish the roof draw a line from the peak of the roof down to the top corner of the back edge of the wall.
Push pull back your triangular gable.
Use the following steps to draw a roof.
Step 12 draw a line from the front vertical line to the right vanishing point.
Step 13 now draw a letter v using the top of the vertical line to the top 2 corners of each square.
You can take this a step further and build multiple roof lines on.
Drawing a roof plan isn t a difficult task if you already have a grasp of basic drafting.
Now we can draw in the ridge lines as shown.
This shows the correct angle for other lines parallel to the top and bottom of the building.
To start drawing in the hipped roof draw lines at 45 degree angles from all the points on the roof as shown in blue.
This a a simple example of how to build a roof line or any other inclined plane when using two point perspective.
The roof plan is sometimes overlooked on some plans but it is a very important feature to a complete set of plans.
Position disc on wall top before drawing.
A roof plan is a view from the top of the house that shows the geometry in flat view of a roof.
Odd roof types dormers.
The 3d drawing also differs very slightly from the line drawings including a false hip connecting the front porch to the bedroom hip to its right and some false roofs over the unseen shed roof and how the garage roof connects to the main roof and lack of crickets.
To draw something parallel to the roof line of the house the tops of windows for example draw a line from the front corner of the building to each of the two vanishing points.
Step 11 draw a vertical line thru the center of the x and draw the front one as high as you want the roof to be.
The 45 degree angle lines represent the hips.
In this step i have drawn in some dashed lines.
Erase the vertical edge you drew in step 3 and the guide you drew in step 2.