3ds Max - Turn an uneven rectangle into a box

Question

I am a game programmer and I am trying to learn 3D Modelling by doing my own art for games. So I run into this problem:

I created this model using a Rectangle. Now, I want to give it more height. I am trying to achieve what this picture shows

I tried using extrude, but it does not do exactly what I need to do. This picture shows the results

I need the bottom of the box to be flat, so it will produce a box with a part of it missing. Any ideas how to do this? I hope I made what I need to do clear. Note that I am a beginner in 3ds Max.

Thanks in Advance,

Jack

Answer 1

Well, if this is an Editable Poly, presumably you are on the halfway.

Use Extrude first, then switch to the front or left view, then select all the vertices which belong to the boottom of object and press Make planar button in the scroll Edit Geometry

Nevertheless, Extrude command won't give exactly what you want. Since your surface is not planar Extrude will not create a box. So the better sequence of commands would be:

1. Switch to an Element sublevel in modyfier and copy element by holding Shift and dragging it down simultaneously. Choose Clone to Element

2. Choose new element (at bottom), switch to Polygon sublevel, click Make planar by and Flip normals (in edit polygons scroll)

3. Switch to Border sublevel, select both porders and press Bridge