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Modeling an ashtray with Rhino 3D - tutorial page 1

 

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This Rhinoceros 3D tutorial is intended for novice users. I teaches very basic rhinoceros concepts like curve creation, revolve and boolean difference.

This is the ashtray we will model in this small tutorial. You should have completed the 2d curves tutorial before doing this one.

Rhinoceros 3D tutorial - modeling an ashtray

Start by using this curve tool to draw the basic shape of the ashtrays section (in front viewport).

Rhinoceros 3D tutorial - modeling an ashtray

Draw a curve similar to this one. Make sure you do this symmetrically relative to the green axis! That will help you later one, for making a nice revolved surface.

Rhinoceros 3D tutorial - modeling an ashtray

With the same tool, draw a curve like this.

Rhinoceros 3D tutorial - modeling an ashtray

Use the mirror command to mirror the bottom curve, using end snap (or grid snap).

Rhinoceros 3D tutorial - modeling an ashtray

Select the side curve and go to curve-offset curve. In the options, choose 'trough point'. You can now pick a point where you want the offset curve to be located.

Rhinoceros 3D tutorial - modeling an ashtray

Use rotate to rotate this curve a bit so that it gets wider at the bottom. Use end snap to snap to the top point while rotating.

Rhinoceros 3D tutorial - modeling an ashtray

This is what we have so far.

Rhinoceros 3D tutorial - modeling an ashtray

Use fillet curve to round the two outer curves.

Rhinoceros 3D tutorial - modeling an ashtray

Move the highest bottom curve a bit higher as shown.

Rhinoceros 3D tutorial - modeling an ashtray

Trim the inner curves, and fillet them. You will need to experiment with how large the radius should be. It should look similar to my image:

Rhinoceros 3D tutorial - modeling an ashtray

To close the top, we will not use fillet. Go to the curve menu, and choose 'blend curves'. You now need to click two open curves to blend. So click the two top curves. A small new curve will be created, that has a perfect blend on both sides with the existing curves.

Rhinoceros 3D tutorial - modeling an ashtray

It looks a bit flat, so we will correct for this. Click long on the 'control points on' button, and drag out the menu. Select the small curve and turn on the control points for it (top left button)

Now click the 'insert knot' button (bottom left).

Rhinoceros 3D tutorial - modeling an ashtray

Turn on 'mid' in the object snaps, and click on the mid point of our small curve. You now added a point to this curve.

Rhinoceros 3D tutorial - modeling an ashtray
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