1) Create an Ellipse, move it to the Origin.
2) Modify the Length/Width appropriately then convert it to an Editable Spline.
3) Create a Rectangle, move it to the Origin.
4) Modify the Length/Width such that in one direction it extends beyond the bounds of the Ellipse, in the other direction crosses the Ellipse at the points where the wall will start and end.
5) Select the Ellipse and Attach the Rectangle to it.
6) Use Cross Insert to create 2 new Vertices at the 2 points where the 2 shapes cross.
7) Select the sub-spline which was the Rectangle and delete it.
😎 Select the 2 small segments of the Ellipse, between the 2 new Vertices, and delete them.
9) Select one of the 2 end vertices and click Make First. I would use the one on the Right (positive X) as it makes life a little easier.
10) With the Ellipse still selected, open the MaxScript Listener and copy/paste the following to the Pink section of the Listener.
getSegLengths $ 1
This will return a long list of numbers in the White section of the Listener - the one you will need is the very last number which is the length of the spline and therefore the length of the wall.
11) Create a Box, Height 48", Length 6", Width the value you obtained from the MaxScript. Increase the Width Segments significantly - the more you have the smoother the curve (at the cost of increasing the Poly Count).
12) Hierarchy Panel > Affect Pivot Only. Click Align on the main Toolbar and select the Box. unCheck Z and Y at the top of the dialog, select Pivot Point on the Left, Minimum on the Right, uncheck all the boxes in the Orientation and Scale sections. Click OK, de-select Affect Pivot Only.
13) Apply an FFD 2*2*2 Modifier to the Box. Expand the Modifier and select Control Points. Select the 2 Control Points on the top of the box at the opposite end to where the Pivot Point is. Move them down to 36".
14) Using 3D Snaps to Vertex, position the Box so its Pivot is in the same location as the First Vertex of the Ellipse.
15) Apply a Path Deform Modifier to the Box, click Pick Path and select the Ellipse. You may need to change the Deform Axis and you may also need to Rotate the result slightly so the end of the box is aligned with the end of the Ellipse. Path Deforms are a bit odd like that...
You can then Convert the Wall to Editable Poly and remove the Ellipse if you wish.
Max 2016 (SP1/EXT1)
Win7Pro x64 (SP1). i5-3570K @ 4.4GHz, 8Gb Ram, DX11.
nVidia GTX760 (2GB) (Driver 430.86).
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