Patch-Mesh 101
Page 9
 

Now that we have our Pendentives started in all four corners, let's make some square cylinders and shape them for our door ways.
Let's get at it. Build a brush that will be wider than the Pendentive and the wall brushes. Make it as tall or taller than the hole for the doorway.
Now go to your x,y view (top view), and turn it in to a square cylinder (curve menu then more cylinders then square cylinder).
Go to your side view x or y.
Now add two more rows (curve menu then insert then add two rows).
Next turn on vertex editing (V key) and then snap the new control points to grid (ctrl+G). Next hit the V key again twice to turn off then back on vertex editing.
Now it's time to move the control points to form the archway.
This is easy to do if you just remember to keep all the points on the same side of the square cylinder when you move them. The first pic below is the front-on view of the square cylinder before we bend it to make the arch. The black-circled control points will be nearest to the inside face of the arch and correspond to the black-circled control points in pic 2. The set of control points in the middle of pic 1(the long rectangle set of control points) correspond to the red-circled control points in pic 2, while the right-hand control points in pic 1 (the blue circled control points) correspond to the blue-circled control points in pic 2.

Make sure the square cylinder arch overlaps the wall brushes the form your doorway.
Now you could of used the patch bend mode to do this but you still would have to move the control points a little afterwards because patch bend has a tendency to be off the grid and not the right shape. Try it and you will see what I mean, I have been told it works great for bending long cylinders but I am stubborn I'm sticking with vertex editing.

Now it's time to finish the Pendentives.
Select one of the bevels that we started in last page, and turn on vertex editing (V key). Move the middle control point (indicated by the little black box in the following pic), over to the right (to where the little blue star is) until it looks like this.

Do that in both views.
Then move the middle point up or down until it matches the arc of the square cylinder like this. The blue stars are the points where you want the edges of the pendentive to match up with the square cylinder. The little blue dot is the control point that you move to do this.

Now turn off vertex editing (V key)
While the newly shaped Pendentive is still selected, hit the shift+S and then click on the set button. Enter 2 in the x field and 2 in the y field.
Keep a eye on the 3d view and try different numbers to see how the texture looks.

Repeat this with all four corners, or just copy and paste it in too all four corners.
Add square cylinders in all archways also.
Then I added a model (models/mapobjects/timlamp/timlamp.md3) for a light in the center.
There. The dome and Pendentives are done.

Download Map file. Dome2

Patch mesh page 10

The following short cut keys will come in handy while working with meshes: