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Description
Fig. 8 shows how to turn the "skylight"- which is flat on the roof- into a vertical window.

Since Point A is directly above the edge of the roof (and by extension is also right above the bottom of the gable here), all that really had to be done was to draw a line parallel to the right edge of the gable- Line AC- from Point E. That should do nicely enough for most things, especially if there is much to do.

Those little pictures on the left side of the page show a more detailed way of doing this, and is especially useful if the gable, for some reason, is longer or shorter than it is now.

The bottom of the window is shown by Points E and G. They are both right on the line from VP2.

From E and G just draw vertical lines going up. Through them draw another line from VP2. Now you have what amounts to a 1VP shape.

Draw an "X" in it. Just as in the earlier part of this tutorial.

Draw a vertical line through the center of the X. Where it touches the top of the gable is where the top of the window should be. That will be Point F.

Connect as shown. Notice how Line EF was not completed; the gable is not transparent!

That's it! No matter how long the gable is or how it slopes, the window will be straight up!

Fig. 9 just shows one way of dividing up the roof if you want to draw more than one gable. In this case, you might want three: one in the middle, and one on either side of it, each in the middle of its half.

For each side of the roof, draw the good old "X."

Do the same for the wall below the roof. Draw up a vertical line from each. You now have the bottom point for each side on the edge of the roof.

Draw lines from each of those bottom points through the center of the "X" above them. Now you have the lines you need to center the gables there, too!

To make sure the tops and bottoms of the gables and windows are all on equal levels, just remember that all points on a line from a Vanishing point are of equal height. Thus, if you drew such a line from VP2 through Point D on the gable in Fig. 8, then the tops of the other gables should be where the Vanishing Point line and those two other 1/2 lines in Fig. 9 meet.

This can be tricky, so be careful.

Good luck!

Description
Fig. 8 shows how to turn the "skylight"- which is flat on the roof- into a vertical window.

Since Point A is directly above the edge of the roof (and by extension is also right above the bottom of the gable here), all that really had to be done was to draw a line parallel to the right edge of the gable- Line AC- from Point E. That should do nicely enough for most things, especially if there is much to do.

Those little pictures on the left side of the page show a more detailed way of doing this, and is especially useful if the gable, for some reason, is longer or shorter than it is now.

The bottom of the window is shown by Points E and G. They are both right on the line from VP2.

From E and G just draw vertical lines going up. Through them draw another line from VP2. Now you have what amounts to a 1VP shape.

Draw an "X" in it. Just as in the earlier part of this tutorial.

Draw a vertical line through the center of the X. Where it touches the top of the gable is where the top of the window should be. That will be Point F.

Connect as shown. Notice how Line EF was not completed; the gable is not transparent!

That's it! No matter how long the gable is or how it slopes, the window will be straight up!

Fig. 9 just shows one way of dividing up the roof if you want to draw more than one gable. In this case, you might want three: one in the middle, and one on either side of it, each in the middle of its half.

For each side of the roof, draw the good old "X."

Do the same for the wall below the roof. Draw up a vertical line from each. You now have the bottom point for each side on the edge of the roof.

Draw lines from each of those bottom points through the center of the "X" above them. Now you have the lines you need to center the gables there, too!

To make sure the tops and bottoms of the gables and windows are all on equal levels, just remember that all points on a line from a Vanishing point are of equal height. Thus, if you drew such a line from VP2 through Point D on the gable in Fig. 8, then the tops of the other gables should be where the Vanishing Point line and those two other 1/2 lines in Fig. 9 meet.

This can be tricky, so be careful.

Good luck!