Making a staircase with railings

In this tutorial I am using an early created railing post (which is described step-by-step in another tutorial). Therefore it is recommended to go through that tutorial before going through this. However If you are hoping to use any other way to create your railing post, model it in the way that it having height of 40 units.

Open a new 3d max scene, create a Box in the perspective viewport and place it at (0, 0, 0).

Select the box and go to modify tab and change the parameters as below.

Switch on 3d Snap Toggle and right click on Snap Toggle button and put a tick on vertex.

Take a copy of the box and place it exacly as below (using snap).

Convert the newly created box into Editable Poly. Go to Polygon sub-object level. Select and extrude the bottom polygon by 8.5 units (up to bottom surface of the other box).

Go to Vertex sub-object level; click the Target Weld button in the Edit Vertices rollout. Select one of the two vertices from the bottommost vertices in the opposite side of the next box and weld it to vertex just above it. Repeat it to the other vertex as well.

Move the unmodified box away and delete following two faces.

Convert the unmodified box into Editable Poly and delete the face which will covers from the deformed box. Replace the moved box back early place using snaps. Select and drag the deformed box while pressing <Shift> key (make sure to turn on snap).

Change the number of copies to 10 and click OK to Clone Options dialog box.

Click one box and attach all the other boxes to it by using Attach button in the Edit Geometry rollout.

Go to Vertex sub-object level; select all the vertices (<Ctrl> + A) press Weld button in Edit Vertices rollout.

Go to left viewport (or right viewport) and create a Rectangle and change Length and Width into 1.0 and 11.0 respectively without unselecting the Rectangle.

Turn 3d Snap and turn on Midpoint in Grid and Snap Point window by right clicking on 3d snap toggle. Create a small circle on the centre of one of the smaller line of the Rectangle with the Radius of 0.5 units.

Select and right click the circle and convert into Editable Spline, and attach the rectangle in to the circle. Then go to Segment sub-object level and select and delete the overlapping segments of the object. Go to Vertex sub-object level and select all the vertices (<Ctrl> + A) and weld.

Exit from sub-object level and apply Extrude modifier and change the Amount to 50.0. Turn on Snap and drag the new objet to one of the inner top vertex of the bottom most stair (see figure below).

Drag the new object onto same point of next stair by holding <Shift> key, and change the Number of copies in to 11 in the Clone Options dialog box and press OK (make sure to switch on 3d snap toggle). Right click and convert one of the newly created objects into Editable Poly. And attach all the other copies to that. Locate the new objet symmetrically on the stairs by changing its X and Y positions by 1.0 unit (may be -1.0, however the magnitude is 1.0).

Go to File > Merge… Select the 3d max file which the railing post is saved and then select the name of the object and select and import the post to the scene.

Locate the centre point of one of the base edges of railing post, on the centre point of one of the top-side edges of newly created object (use bottommost step to locate). (see figure below)

Copy 11 objects onto same position of the other steps using the same method used early.

Go to Front viewport and create a box (Length-5.0, Width-7.0 and Height-10.0). Right click and convert the box into Editable Poly. Go to left viewport and snap the vertex to topmost and bottommost posts as below.

Go to Polygon sub-object level, select the bottom polygon and extrude 0.1 units. Same way extrude to polygon by 1.0 units. Select upper 3 side polygons and extrude by 0.1 twice.

Select bottom 3 side polygons and extrude by 2.0 units and 5.0 units respectively. Then make the three selected polygons planer by pressing Make Planer button in the Edit Geometry rollout. Then extrude by 2 units again.

Exit from Polygon sub-object level, go to Front viewport and align the object to railing posts by using Align button (use tick only to X Position and Centre option for Current and Select Objects). Apply TurboSmooth modifier and set Iterations to 2.0.

Select one post and attach all the other posts and newly created object to it. Switch on Snap and press <Shift> and drag a copy to other side of the staircase. Go to Top viewport and move the railings towards each other by two units. Now you get the complete staircase with railings.

Render and see how the final result looks like.

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