# Exercise 205

Introduction:

There are two primary ways to use the power of 3D computer modeling software to produce architectural models. In this exercise, you will explore “modeling through layers of details.” For this exercise, you will be modeling a piece of a concrete walking bridge that you will use later in the class.

Part 1:

• Begin by drawing the shape documented below (units are in inches). The point indicated by the arrow should be the origin (0,0). This is the cross-section of the bridge you will be making. For this step, you will need to use Snap (Rhinoceros 5.3 [grids]), Osnap (Rhinoceros 5.4 [osnap]), & the polyline tool (Rhinoceros 5.5 [polylines]). You may wish to do this step in the “Top” viewport, then switch to the “Perspective” viewport for the next step.[Premium Content - Login] [Membership Options]
• Next, use the Rotate3D command (Rhinoceros 5.6 [rotate3d]) to rotate the object into the vertical position.
• Now, use the Offset command (Rhinoceros 5.7 [offset]) to create another object 4 feet from the first.
• Select both objects and type “explode” to create individual line segments from the polylines.
• Select two opposing curves and use the Surface>Loft command (type “loft” in the command line) to create a surface between the curves. Repeat this process for each pair of curves.
• Next, draw two diagonal lines (dashed below) across corners of each end and two horizontal lines extending from the walking surface to the outside of the section (shown dashed below also).
• Select the curves surrounding each potential end surface and use the Surface>Patch command (patch) (Rhinoceros 5.8 [patch]) to create 5 surfaces for each end of your object.
• Now use the Surface>Chamfer Surfaces (type ChamferSrf into the command line) to create beveled corners between each surface. You will need to adjust the distance to be 1/2” (0.5”) then select the first surface followed by the second surface.
• When you have finished chamfering both sides, use the Edit>Trim command (type “trim” into command line) to clean up any unnecessary surfaces.
• Using the skills you learned in Exercise 204, assign a concrete material to the object and place an infinite plane below your object.
• Note: This should be below your object and you may need to move the plane vertically to satisfy this condition.
• Set up a view of the final object that you like. Click the render button on the toolbar (or Render>Render) to create a rendered view of your final shape.
• Post the rendered image to the course website. You don’t need to comment on this exercise.