Array Pedals

Question: Is there a way of arranging the pedals in the attachment so three of them are equally spaced around the shaft. - Steve

Answer: In the Top view use ArrayPolar, snapping to the center of the shaft edge with the Cen Osnap to set the center of the array. - Pascal

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Decorative Scrolls

I am hoping someone can help me... I am attempting to draw some decorative scrolls (similar to those in the attached picture), and was wondering if anybody knew the correct method to go about it. I can free hand sketch thedamn things, but they don't look so flowing when I'm interpreting them in Rhino.

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Tire Tread - Flow Along Surface

I'm trying to create a tire thread. Have a tire, and threads, and try to flow the threads along the tire surface.

Basically it always wraps the wrong way around the tire. So it's wrapping the width of the threads as opposed to the height. Eg, the thread has 3 shapes horizontally but the 3 shapes repeats 50 times vertically. I want the 50 shapes flowed (that goes vertically) but it keeps wrapping the 3 shapes that is horizontal.

I tried to change the orientation of the threads by rotating them various
way along the X, Y, Z. I thought maybe it has to do with how they are oriented. But still no luck. - Less

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Your tire blank is a single surface - you need to split it so that the tire tread area matches the base surface, like the yellow surface below. Also, you'll need to trim your base surface so that the treads line up at the seam so it won't have that gap.

You'll need to do both, but if those still don't get you all the way there, you can try swapping U and V using Analyze Direction. - Hans

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How to approach fillets

1. Get all the planar surfaces in place.
2. FilletSrf at the two radii you want to use.
3. Untrim the fillets and intersect the fillet surfaces with the top and bottom planes.
4. Loft the resulting curves (Refit option due to incompatible curves), then trim and clean up, Join.
5. Filetedge the edges that work.The front corners do not at .25 because the radius of the edge itself there goes down to about .18
6. Create Tangent blend curves between the edges of the fillets. The top oner needs to be adjusted so as not to bulge out too much (See the red and white curves)
7. Trim back the surfaces
8. Network surfaces matching for tangency.
   
   

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Cylinder In a Box

Draw the red line using osnap end on both corners of the cube, then use the cylinder command and the first point locate it in the osnap mispoint of the red line. The direction of the cilinder is relative to the view you are using for drawing it.



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Design a Helmet in Rhino

Start with something like this. redraw the curves to get the exact shape you are looking for. Then use rail revolve, extrude both sides and split.


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Build a Road in Rhino 3D

1. Mid line of road
2. Horizontal line perpendicular to curve '1' - representing road width.
3. 3 sweep1 surface created in with the roadlike top option.
4. Instead of a straight line for the the road width you could substitute a real road section.

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Create a connecting surface to two pipes with the same cross section area

First I divided the pipe into 4 parts, two pairs of symmetrical pieces. Then I built the red and blue curves for the initial loose loft. Loose loft is the easiest way to controllably guarantee continuity in simple cases. The blue lines are actually degree 2 curves with the middle control point weight matching the arc middle control point weight to make sure all iso curves in the resulting surface will be nice and straight.

Then I built the initial Loft with Loose option, and extracted a section in the middle and built a planar surface from it. Used the area (about 315) and the target area (308) to calculate a scale factor (about 0.97) for the section curves. Scaled the section curves (magenta) and finally built another loose loft from all the curves. The cross section area is 308 dot something all the way.


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2D DXF to Rhino 3D

You can bring in the drawing and position and scale it as you suggest. It is easy enough to move the elevation part of the drawing to the front view... (See RemapCplane). But from there on out, it looks to me like you will need to redraw many if not all of the curves in Rhino. The dxf curves are very dense polyline approximations of the curves and are not really suitable for making surface geometry directly.

You should probably bludgeon your way through at least the level 1 training material (on the Rhino CD) and get fairly familiar with the curve drawing tools. The level 2 training stuff will help as well once you have a good feel for the basic tools- it has a chapter or two on aligning curves in 3d and using them to create surfaces. This project might be a good way to learn all that but I would be perpared for some false starts as there are some potentially somewhat complex shapes in there- the canopy, the vents in the cowling, etc. for example.

Attached is a file with the curves in position. A new curve drawn for the cowling, using the dxf as a reference, and a surface revolved for the cowling. You might want to do more shifting of curves to layers for clarity of course etc. but this is how I would get started.


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Rope on a curve

1. Path curve, White
2. Spiral, Around Curve
3. Cplane set perp to the path curve. Profile curve on place.
4. Sweep2 along path and spiral

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Model a Philips Tip in Rhino 3D

1. Surfaces revolve and Sweep1 rail
2. Array Polar
3. Boolean Difference

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Model a Pillow in Rhino 3D

1. A simple curve works best.
2. Copy vertical 3 times.
3. Leave the base curve and at least one vertical copy up from it alone.
4. On the next curve use Smooth in X nd Y directions only a few times to smooth out the base shape somewhat.
5. Copy this curve vertically again and smooth it some more, as well as Scale2d a bit smaller.
6. Scale2d another copy
7. Place a point object in the center of the smallest curve.
8. Loft all of the curves to the Point, making sure the Loose option in Loft styles is chosen.
9. The shape can be varied by the level, number and position of the curves- make sure the smallest curve in the middle and the point object are always coplanar. You can also turn on the points of this surface and move rinmgs of points up ands down to edit the shape. Again be sure the middle point and the next ring of points stay coplanar

To make the pillow a little softer looking:

1. OneLayerOn
2. Bend a Pillow layer.
3. Zoom extents

Cyan curve = target shape
Red curve= Current shape
Note: These curves are the same length for minimal distortion of the surface.

Use Flow (Transform menu>Flow along curve). Red is the orignal 'backbone' Cyan the new 'backbone' curve. Join after Flowing.


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Model Heart Aorta in Rhino 3D

1. Add one curve vertically between the lower branches (white).
2. Loft both branches together with this curve (red surface)
3. Trim this with a plane.
4. Loft the upper curves.
5. MatchSrf for tangency the upper to the trimmed loft.

I added a knot horizontally in the lower span of the blue surface before matching to limit the area distorted by Matchsrf.

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Curved Flange Around Pipe Intersection

Sweep 1 the little rectangle along the edge curve that belongs to the outer horizontal pipe surface. Use 'Align with surface' in th Sweep 1 dialog.

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How To Draw Pyramid Knurl in Rhino 3D

1. Make a pyramid: square base extruded to point
2. Array to desired flat dimension
3. Flow along curve

Armido

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Creating a surface by extruding a curve

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How to close this loft smoothly – Pascal

It's a network surface and a couple of profile curves. You need the split the edge of the original surface to create the two edge curves as input for the NetworkSrf, needed to maintain continuity. - Pascal

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Organic Text

1a,1b, and 1c are the original curves used to create the organic font. They were produced using the curve option in the standard Rhino text tool using COMIC SANS MS font. You could prepare your outlines using any curves drawn in a plane.

In column 'a' the solution leads to a blend surface
In column 'b' the solution leads to a patch surface
In column 'c' the solution leads to a network surface
In row 2 all the letter curves were rebuilt to produce less control points (in this case 20) 'a'

4a Extrude the curves to form an inner and outer surface. Use blendsrf to create the surface. Use the tangency option.

5a The finished letter 'b'

3b Copy the curves up. (I did this only to get a more vertical shape at the edge) Offset the upper curves as shown and move the offest curves up.

4b Patch all the curves using
sample - 1
u - 10
v - 10
stiffness - 0.001

5b In the front view trim the patch using the outer base curve to produce the finished letter. 'c'

3c Split the C at two points: one each 'end'.

4c Copy vertical pairs of lines below the curves (snap to near)
Blend the top end of the lines to produce section curves.

5c Using the curves of the C and the section curves create a network surface
to give the finished letter.

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Swimming Pool – Pascal

A 3 (longitudinal) section curve loft gives a beautifully smooth pool shape. I'm trying to construct a swimming pool that should look organic and "flowing." The attach files show what I've done so far, but I'd like to get something that combines more of the accuracy of the PlanarSrf model with the smoothness of the Lofted version.

Ideally, I'd like to have the steps smoothly blend into the walls which should flow into the floor. The Lofted example is closest in spirit to this but I need more control over the placement of the steps.

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Model a Newsom Chair in Rhino - Dave Rutten

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