Materi 1.7 (Boolean Intersection Ring)

Boolean Intersection Ring

Create the flat design; then the curved shape of the ring. Extrude the design and Boolean Intersection it with the curved ring.

Boolean Intersection is useful for combining a curved surface with a complex design to create a curved – yet complex – design element, such as the top of this ring. Simply trace the design with curve tools, ensuring it is flat (planar) and closed. Extrude all the curves to create the cut-outs. Now, model the ring with the profile shape you want at the curved portion of the design (and flat along the top for gems, if you wish). Boolean Intersection the design with the top of the ring, creating a curved cut-out design. Extract the endcaps of the remaining portion and sweep them. A few tricks close this model up!

Icon Key:

1. Place a Ring Rail

Select a size for this ring using the Ring Rail tool from the Tools menu. Click the green arrow to place it in the viewports.

2. Picture Frame

Use the Picture Frame tool from the View menu to place an image of the ring in Through Finger. Click and drag from left to right – holding down Shift to engage Ortho – to place each edge of the BOTTOM of the image. Move and Scale 2D to center this ring on the finger rail. Avoid selecting this by placing it on a layer you don’t use much and “Locking” it.

3. Interp Curve

Using the Interp Curve tool, trace ½ of the design for the top of the ring and Mirror it. Join the two halves. To make a “sharp edge” with Interp Curve, press Enter, stop the curve, and Enter again to start the tool right back up. Make sure it snaps to the End of the previous curve so they will Join. Trace the “holes” in the design with closed curves so they will extrude as “holes” in a future step.

4. Offset, Trim

Select the ring rail and Offset it, using the Through Point option, just to the base of the design. Select the design and the finger rail and Trim away the intersection portions to create a single shape (Picture Frame Hidden, above). Join this shape and check that it is a Closed curve so it can be extruded as a solid in a future step.

5. Create Outside Rail

You can build your own Outside Ring Rail and still have it interact with Matrix History! This outer ring rail was built by Offsetting the ring rail; adding an Arc Direction from the Quad of the rail to a point at the “squared-off” top, Mirroring that arc, and adding a final Arc Direction to connect the top. Fillet the corners at 0.3.

6. Profile Placer

Select the ring rail and run F6 > Profile Placer to add profiles to the rail. Select the “Second Rail” option and click the outer rail. Using the “Edit” option in the profile placer, draw the shape of this profile in the Edit Profile window: flat along the bottom with the Line tool (Both Sides option); Copy the line to the height desired for the

profile. Now, add a rather puffy-shaped Arc between the two, depending on how curved you want the surface of the design. Mirror the Arc curve and Trim all four together. Join them, name and save the profile, and Return it to the viewports. Mirror profiles, and Add another set: placing one set just past the end of the design; and the other at the “joint” in the outside rail shape, to best control the sweep.

7. Sweep 2 History

Run Sweep 2 History, selecting the two rails and four profiles – in the order indicated by the directional arrows – and make certain “Closed = No” in the Command line.

8. Profile Tool or MSR

You CAN edit an outside rail you created yourself with regular old curve tools, and still see the results in the surface swept with Sweep 2 (as long as you followed the rest of the directions carefully)! Simply select the curve and press F6 > MSR or input it into the “Profile” Tool. This adds handles to any curve!! To get the handles

properly aligned on the curve, use the “Edit” option in the Command line, and choose the “Edit Origin” suboption. Drag this point to the bottom, the center of the curve, pointing upwards, and choose the “Move” option to return to the Control Handles. Shrink the outside curve down so it just intersects the top of the orange design curve: this will ensure the top of the ring is flat, matching the top of the surface, to accommodate your gems.

9. Extrude, Cap, Boolean Int.

Select all the orange curves and Extrude them, using the “Straight” and “Capped” options. If you did everything right, you’ll have a solid shape. Also, Cap the surface you swept in Step 7. Start up Boolean Intersection and select the capped, swept surface as one object to intersect. Press Enter. Then, select the extruded shape. The shape of the ring will remain!

10. Extract, Dup Edge

Startup “Extract Surface” and extract both end caps on the new object. Delete them. Using the Dup Edge tool, click along the open surface at the TOP of one side of this surface, creating a curve here. This opening and the profile used to sweep the surface touch perfectly, so we’ll use this to our advantage, to close up the model, in just a minute!

11. Dup in Place, Split

Because we don’t want to lose any of our original work, select the profile that touches the curve from step 10, and run the “Duplicate” command with the “In Place” option in the Command line. With the new profile still selected, run “Split”, and split it with the curve created in Step 10.

12. MSR, Profile Cap

Join the new half-profile (top half) to the cutting curve created in Step 10, and run MSR or the Profile tool, using Edit > Edit Origin the way you learned in Step 8 to turn it into a profile. Now you can run Profile Cap and create an attractive little cap here. Mirror the cap.

13. Sweep 2

Sweep 2 finishes the bottom of the ring. The two profiles on either end of this open sweep are the original ones you placed in Step 6. Because they touch the intersection surface and the Profile Caps perfectly, the model will Join up! Add gems and Boolean Difference cutters if you wish.

Great ...... looks good.

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