Creating Surface Problem - Polyloop

bwtr · 14th June 2007, 05:01

After a bit of trial and error I was able to work out a method of making the selection as shown on the image.

I feel I should be able to use the Bridge tool, or one of the surface modelling tools, on this. Any advise please?

jbshorty · 14th June 2007, 05:23

"ruled surface"... Just make sure you select the corresponding vertex on each curve otherwise it will twist. Or maybe you want it to twist? It can do that too...

shorty

mikebres · 14th June 2007, 05:34

Ruled Surface

mikebres · 14th June 2007, 05:36

If you turn one of the circles perpendicular to the other you can use the Sweep

mikebres · 14th June 2007, 05:38

If you add another line for the sweep profile you can do a Double Sweep

bwtr · 14th June 2007, 06:32

Thank you. With the actual shapes I want to use I think it will have to be the double sweep approach.

bwtr · 14th June 2007, 07:34

The solutions do not seem to work on the attached Hex file. Would appreciate comments/suggestions.

Couerl · 14th June 2007, 08:39

Brian, way too many points on beziers and interpolates to bridge or rule or sweep or extrude effectively.

You could draw those same shapes with 5 or 6 points from a regular old straight polyline and rule surface them. Then after you have your basic rough shape you can work in greater definition by adding more lines, poly's or whatever. One of the problems in learning how to model is to start basic and then work in the details. Keep at it and keep asking questions, you deserve to get the most out of it.

bwtr · 14th June 2007, 09:08

Thanks mate. Makes a lot of sense. What I think of as simple ways within my working experiences dont often seem to relate as being simple when in 3D!

mikebres · 14th June 2007, 16:22

Using your file, when I added the surface the form was twisted.
So, I deleted one of the curves, duplicated the single curve that was left, to have two profiles for the surface tool, and applied the Ruled surface to get this result.

jbshorty · 14th June 2007, 16:27

Quote:

Originally Posted by mikebres

Using your file, when I added the surface the form was twisted.
So, I deleted one of the curves, duplicated the single curve that was left, to have two profiles for the surface tool, and applied the Ruled surface to get this result.

that is a good explanation of setting up 2 curves for a ruled surface. But it's the long version of just fast extruding a single curve

...

bwtr · 15th June 2007, 02:12

Mikebres--yes. That defeats the aim of the exercise where the need is for those two different curves. (They were not identical curves) Thanks though.

mikebres · 15th June 2007, 05:41

Ah, see! I knew there was something different about that second curve.

bevans · 15th June 2007, 08:28

Worked for me with ruled surface. Is this what it's supposed to look like?

bwtr · 15th June 2007, 10:31

Yes. How did you get that and others can not? Very Odd!

bwtr · 15th June 2007, 10:36

This is what I get.

Patrick210 · 15th June 2007, 13:52

I got the correct result also. You have to click on the same position on each curve.

bwtr · 15th June 2007, 15:12

More work for tomorrow. Maybee I have found a particular common point. Thanks.

bevans · 15th June 2007, 15:23

After clicking ruled surface, make sure the first curve you select is the first curve in the scene tree. At least in this case, because it seems to make a difference.

Couerl · 15th June 2007, 20:50

I'm curious what you intend to do with this shape. My earlier point was only to suggest that it was way too high poly and not that it couldn't be done. It's rare if ever that I use an interpolated curve for extrusion, never really use ruled surfaces and I don't think I've ever even touched beziers, I just can't think of any reason why you might need them.

14th June 2007, 05:01	#1 (permalink)
bwtr Brian Join Date: Jul 2005 Location: South Australia Posts: 2,096	Creating Surface Problem After a bit of trial and error I was able to work out a method of making the selection as shown on the image. I feel I should be able to use the Bridge tool, or one of the surface modelling tools, on this. Any advise please? Attached Thumbnails Last edited by laughingnome; 18th June 2007 at 02:55. Reason: typo

14th June 2007, 05:34	#3 (permalink)
mikebres Vertex Join Date: Nov 2005 Posts: 17	Ruled Surface Attached Thumbnails

14th June 2007, 05:36	#4 (permalink)
mikebres Vertex Join Date: Nov 2005 Posts: 17	If you turn one of the circles perpendicular to the other you can use the Sweep Attached Thumbnails

14th June 2007, 05:38	#5 (permalink)
mikebres Vertex Join Date: Nov 2005 Posts: 17	If you add another line for the sweep profile you can do a Double Sweep Attached Thumbnails

15th June 2007, 08:28	#14 (permalink)
bevans Vertex Join Date: Jun 2006 Location: Broken Arrow, OK Posts: 14	Worked for me with ruled surface. Is this what it's supposed to look like? Attached Thumbnails

14th June 2007, 05:23	#2 (permalink)
jbshorty proud to be a nurb Join Date: Jul 2006 Location: only in your mind Posts: 1,365	"ruled surface"... Just make sure you select the corresponding vertex on each curve otherwise it will twist. Or maybe you want it to twist? It can do that too... shorty

14th June 2007, 06:32	#6 (permalink)
bwtr Brian Join Date: Jul 2005 Location: South Australia Posts: 2,096	Thank you. With the actual shapes I want to use I think it will have to be the double sweep approach.

14th June 2007, 08:39	#8 (permalink)
Couerl Polygurbs Join Date: Jul 2005 Location: Denver Posts: 1,301	Brian, way too many points on beziers and interpolates to bridge or rule or sweep or extrude effectively. You could draw those same shapes with 5 or 6 points from a regular old straight polyline and rule surface them. Then after you have your basic rough shape you can work in greater definition by adding more lines, poly's or whatever. One of the problems in learning how to model is to start basic and then work in the details. Keep at it and keep asking questions, you deserve to get the most out of it.

14th June 2007, 09:08	#9 (permalink)
bwtr Brian Join Date: Jul 2005 Location: South Australia Posts: 2,096	Thanks mate. Makes a lot of sense. What I think of as simple ways within my working experiences dont often seem to relate as being simple when in 3D!

15th June 2007, 02:12	#12 (permalink)
bwtr Brian Join Date: Jul 2005 Location: South Australia Posts: 2,096	Mikebres--yes. That defeats the aim of the exercise where the need is for those two different curves. (They were not identical curves) Thanks though.

15th June 2007, 05:41	#13 (permalink)
mikebres Vertex Join Date: Nov 2005 Posts: 17	Ah, see! I knew there was something different about that second curve.

15th June 2007, 10:31	#15 (permalink)
bwtr Brian Join Date: Jul 2005 Location: South Australia Posts: 2,096	Yes. How did you get that and others can not? Very Odd!

15th June 2007, 10:36	#16 (permalink)
bwtr Brian Join Date: Jul 2005 Location: South Australia Posts: 2,096	This is what I get. Attached Thumbnails

15th June 2007, 13:52	#17 (permalink)
Patrick210 Pixar want to hire me! Join Date: Apr 2004 Location: Florida, USA Posts: 549	I got the correct result also. You have to click on the same position on each curve.

15th June 2007, 15:12	#18 (permalink)
bwtr Brian Join Date: Jul 2005 Location: South Australia Posts: 2,096	More work for tomorrow. Maybee I have found a particular common point. Thanks.

15th June 2007, 15:23	#19 (permalink)
bevans Vertex Join Date: Jun 2006 Location: Broken Arrow, OK Posts: 14	After clicking ruled surface, make sure the first curve you select is the first curve in the scene tree. At least in this case, because it seems to make a difference.

15th June 2007, 20:50	#20 (permalink)
Couerl Polygurbs Join Date: Jul 2005 Location: Denver Posts: 1,301	I'm curious what you intend to do with this shape. My earlier point was only to suggest that it was way too high poly and not that it couldn't be done. It's rare if ever that I use an interpolated curve for extrusion, never really use ruled surfaces and I don't think I've ever even touched beziers, I just can't think of any reason why you might need them.

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