The Model

Make sure your menu set is set to "Modeling".

Select the "Polygons" tab.

Click the "Polygon Cube" button.

[www.metric-conversions.org]

xform -ws -a -rp 0 0 0

In this section I will show you how to make 2 cubes in Maya.And a Cube will be created in the center of your scene. The cube will also have a polyCube input which defines the cube's Width/Height/Depth subdivisions and let's you scale its size. By default in Maya 2016 you will get 1 subdivision in each axis, if you don't then set each axis to have 1 subdivision. Keep the Width/Height/Depth to 1 as well.Now that we're on the same page we can remove this polyCube input. We don't want any of these inputs when we export to OBJ. These inputs are considered "history" and to remove them from a shape we select the shape and go to Edit -> Delete All By Type -> History. Remember how to do this because you will need to do it before you export any shape if the make any history.Now we can scale our cube to become a bed or something. If you're American and have an imperial tape measure let me show you how we can get that bed to scale. A typical queen sized bed is 80 inches by 58 inches and 12 inches high. Put each of these numbers here and input them into each axis of the cube's scale. X and Z will be 2.032 meters and 1.473 meters, the Y will be .305 meters.Let's get our mattress on our virtual floor which is represented by the grid of our scene. We want to snap the mattress to the grid, but right now our pivot is in the center of the shape. To move the pivot hold D and V at the same time, click and drag the Y axis transform and hover your mouse cursor over one of the bottom corner verts of the mattress before letting go. Now your pivot is snapped down to the bottom vertices of the mattress. Hold X, click and drag the Y transform up. This will snap our mattress's Y axis to the grid. Move the mattress on its X or Z axis a few meters away from the scene's center.Make another cube and follow the same steps above, but make it a different size or something. Don't forget to delete history.Now that we have our 2 cubes the size and in the positions we want we need to freeze their transforms, which means zeroing out their XYZ translations, scales and rotations. Select both cubes and go to Modify -> Freeze Transformations.Another thing we need to do is set every shape's pivot to the 0,0,0 of the scene. To do this select both cubes and at the bottom of Maya there is a place to put MEL scripts into, click this text box and enter:That last thing we should do is give each shape a name, "mattress" and "something" are good enough.