: 3ds Max - Turn an uneven rectangle into a box 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

@Sarah814

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:


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





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





Switch to Border sublevel, select both porders and press Bridge

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