Rhino 4 NURBS Solid Modeling Tutorial – Model a Webcam Step-by-Step
| Step 21.a In the top viewport, activate the Plane command. Draw a plane that is larger that the revolved surface. |
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| Step 21.b In the Top or Front viewport, ctivate grid Snap, and drag the plane up 1/2″ by clicking and dragging. |
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| Step 22 Select the plane from step 21, then activate the Trim command. In the Right or Front viewport, trim off the parts of the revolved surface that are below the plane. Delete the plane after trimming. |
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| Step 23.a In the top viewport, activate the Plane command again. Draw a plane that is larger than the revolved surface. |
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| Step 23.b Select the revolved surfaces, then activate the DupBorder command to extract curves from the surface’s edge. With the curves still selected, activate the Project command from the Top viewport, and select the Plane from step 22 to project onto. Delete the Plane from this step. |
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| Step 24.a Loft a vertical surface between each set of curves–select the inner top and inner bottom, then activate the Loft command. Set the style to Normal and Do Not Simplify Cross-section curves. |
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| Step 24.b Do the same for the outer top and outer bottom curves. |
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| Step 25 Select the two bottom curves, then activate the PlanarSrf command to create a bottom surface. |
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| Step 26.a Turn on grid Snap and Osnap, with only the Knot option checked. Activate the Sphere command. Type ‘3′ or click on 3Point to define a sphere using three points. For the first point, snap to one of the four knots on the inner revolved surface that is around the open circle on the top. |
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| Step 26.b For the second point, snap to the knot opposite the first one you selected. |
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| Step 26.c For the third pick, enter the point with world coordinates (0,0,3). ‘w0,0,3′ in the command line. |
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| Step 27 Use the inner/lower revolved surface to trim off the top portion of the sphere from step 26: select the inner revolved surface, then activate the Trim command. Select any part of the sphere that lies above the revolved surface as the surface to trim. |
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| Step 28 Repeat step 26, but this time use the knots on the upper revolved surface. Use the same coordinates for the third point. |
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| Step 29 Repeat step 27, but this time use the upper revolved surface to trim the sphere created in step 28. |
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| Step 30 Select all the surfaces, then join them into a solid by activating the Join command. Check with the What command to make sure you have a valid polysurface that is closed and solid. |
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