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Depend upon it there
comes a time when for every addition of knowledge you forget something
that you knew before. It is of the highest importance, therefore, not to
have useless facts elbowing out the useful ones. Sir Arthur Conan Doyle (1859–1930), Author. Sherlock Holmes, in A Study in Scarlet (1887). |
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Closed Stairs |
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 To draw this style stairs you will need to first determine the number of steps you need for the tower based on the circumference of the tower and the height to the next floor. Normal stairs have a rise (distance up) of 7-9" and a tread (depth of step) of 12". Curved stairs have a tread of about 16" along the outside edge or 9" along the inside edge. Using a 20' diameter tower which has about a 60' circumference with 12' between floors. (Do not forget to add the thickness of the upper floor.) Every three steps would rise about 2'-3" and cover about 4' of the wall. To go up 12' it would take 15 steps. (144"/9"=16 take away one for the upper floor which leaves you with 15 steps.) 15 steps would cover about 20' of wall space or a 1/3 of the way around the tower. (15/3 steps per 4' of Wall equals 5. Multiple 5x4'=20') This means you would need a Regular Polygon of 45 sides. Draw the Regular Polygon with Ortho on (use relative
coordinates to make sure it is close to 10' radius.) Draw the inner
Polygon using the same center and along the same Ortho Line making the
inner polygon at -3' to -5', again using relative coordinates. Draw the
treads using the Endpoint Modifier to pick up the endpoints of the sides
of the Regular Polygons. Erase the inner Polygon and Project the remaining
Entities. You can Rotate all the Entities if you need to adjust the
location of the stairs prior to Extrude each step starting with the lowest. Use relative coordinates to determine each height. A rise of 9" has the pattern of... (x'-0", x'-9", x+1'-6", x+2'-3", x+3'-0"). Send the higher steps behind the lower steps You will not need to do this for all the steps, only until you reach the backside of circular area. The actual Steps and number of steps will depend on your Projection and position of Steps. Change the outer Polygon to the desired Floor Fill and send behind the steps using back or by fronting the steps. STAIRSAMPLES.FCW file containing images of each step. To Tutorial 2 :
Open Stairs |
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