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Can anyone help with this.problems extruding along a path

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kilbsy
Can anyone help with this.problems extruding along a path
on Feb 11, 2006 at 2:21:55 am

I am trying to create skirting boards that follow edges of rooms,doors,windows etc.I am using extrude for this.
The problem I am having is that the extruded skirting board does not appear to be attachet to the path curve. I dont know what the correct settings are in the extrude dialog box.
Under surfaces extrude?

Also my extrusion seems to taper at the end point. I just wanrt a simple skirting board all the way around the bottom of the room which is an irregular shape. Must I use another profile curve for the end point. Also where is it best to position the profile curve.

Any help appreciated the way I have been doing this so far is verytime consuming. I have a lot of window/door frames to complete using this method if it is the easiest.
Any help appreciated this is killing me..cant find simple explanantion on help files...maybe I am looing at it wrong!?1? Barry


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Ben Insler
Re: Can anyone help with this.problems extruding along a path
on Feb 12, 2006 at 12:17:49 am

http://www.photosector.com/Sections+index-req-viewarticle-artid-13-page-1.h...


that site may help you.

best,


Ben Insler

Editor

Telemark Films


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kilbsy
Re: Can anyone help with this.problems extruding along a path
on Feb 12, 2006 at 6:09:38 am

Hi thanks for your help, tried the tutorial but didnt work in my case. the results are unpredictable. I tried changing setting to flat ratther than tube. This seems better but the orientation of the extrusion is the wrong way round and too big.

Here is what I am trying to do. It seems simple enough but i just cant find an easy way to do it.
First I have an 'H' shaped room extruded from a linear curve to make the walls. Now I want a skirting board around the base of the room, inside the room in the appropriate place. So i do a profile curve for the shape of the skirting board , snap it to original curve and extrude. I dont know which settings to use. It is always the wrong size or direction and with irregular shaped rooms the scaling of it puts it out of position with the rest of the room. I wonder if anyone can tell me how they approach this problem. Sorry if the answer is staring me in the face but I cant see it. This is the 3rd time i have posted the same question but still cant do it.

Thanks,
Any help greatly appreciated so I can get on with my work!!!


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cowcowcowcow
Jason Brummett
Re: Can anyone help with this.problems extruding along a path
on Feb 13, 2006 at 6:51:57 pm

I wish I could help you but what your asking for is outside of a forum or just to lengthy.

What I can add that I doubt was put in that tutorial is that you should rebuild your 3dgree curves if you have them to 1 degree with many more knots. This way your mimicking what 1 would usually use to loft or extrude in a Bezier package. Secondly it's important to know that Maya isn't always the best solution for extrusion when it comes to profile shapes that are very squarish or non-organic, it can be done but 1 needs to know how to fiddle withe the shapes properly.

Also there is a strange bug in Maya's extrusion algorithym that I haven't come across in a while but was there in Version 4. If your squareish extrusion was showing pinching at certain points, you needed to rotate slightly off hoirzontal or 180 degrees your extrusion shape and then it would pop back into place properly, search HE3D for this info.

Sorry I can't be more help. If you send a file for 1 of us to look at we can better assist you.

Jason Brummett
Studio Z Inc.


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kilbsy
Re: Can anyone help with this.problems extruding along a path
on Feb 15, 2006 at 4:52:54 am


Really?

I thought it would be quite simple. For simplicity's sake lets say i want to put a skirting board on a square room. How would I go about that. The simplest way. Not necessarily using extrusion. Perhaps lofting between shapes is better. This must be a common thing for people designing interiors to do. I cant find how they do it any where. Guess i will be stuck making each individual skirting board for each wall and door frame + time consuming. I am sure there is an easy and simple way to do this...Any ideas?
I'm almost there but it never turns out right. I want the skirting board attached to the bottom of the wall......Any ideas?


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Jason Brummett
Re: Can anyone help with this.problems extruding along a path
on Feb 15, 2006 at 1:19:44 pm

square room? Revolve a profile and set sides to 4. I'm not saying you can't do more complex 'skirts', i'm saying you need to just learn the ins and outs of it.

Send a scene file and someone will setup the solution and you can look at that.

Jason Brummett
Studio Z Inc.


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kilbsy
Re: Can anyone help with this.problems extruding along a path
on Feb 16, 2006 at 6:57:16 am


Hi thanks for your help,

I am not so hot on Maya and am wondering what you mean by revolve a profile and set the 'sides to 4'. I have used revolve before but don't know where a sides option is. I am sure I can make a square skirting board for a square room however what I am trying to do is put a skirting board around the bottom of a room that is already built. I want to know how someone would go about this. I don't need a full tutorial I just need pointing in the right direction.

Do I position profiles around the room in the corners at 45 degreeangles and use loft?
Or do I use extrude along the curve that follows the base of the room.

How would anyone else go about this?
I need the skirting board technique for a lot of projects and want to know the easiest way to do it.

Thanks for your help..


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Jason Brummett
Re: Can anyone help with this.problems extruding along a path
on Feb 16, 2006 at 1:50:02 pm

alright, I'll try to "point you in the right direction" 1 more time as I hate that learning frustration that your obviously going through.

Before you start make sure your in the Modeling Module of Maya. To do this press F3 on your keyboard and the menu will switch to modeling and make sure you have your histroy enabled (Scroll bar looking thingy on the status bar). Press F1 and search for history if this doesn't make sense.

Now for this mini tut.

build your curves with the EP Curve tool.
You should set your EP curve tool to Degree1 in the options box and leave it that way. That way you know your getting a straight line segment when using EP Curve and Curved lines when using CV Curve tool.

To make things easier select the Polygon or Nurbs walls you wish to put the skirt against and go into Display>Polyon Components>Vertices.
For Nurbs it would be Display>Nurbs Components>Edit Points.
Now snapping your EP Curve will be much easier. When done snapping simply turn the display options back off for those objects.

Now enter the EP Curve tools as explained before and snap the curve during construction to the base of your wall geometrys vertices etc. Keep going till your curve has formed a complete loop or as far as you need to make 1 skirt for. This is easily done in the Perspective view and note that you can fully Zoom and navigate in Maya during object creation (1 of the many things that make it so awesome). If your skirt or extrusion requires a curved wall. you should build that curve seperately for now from the EP curve and I would recommend using the Create>Arc Tools>2 point or 3 point arc. You can then simply attach your 1 degree curve to this afterwards to make 1 continuous loop. You need to read through the help docs on these things. Way too hard to explain everything here on a forum.

In the front viewport (Doesn't have to be, just easier) create an open shaped profile, It's best to use the Grid for Snapping (hotkey X) to rough in the general shape your after you can scale it up or down later but make sure that your profile has it's top or bottom of the curve Touching the Verticle Axis of X (front view assumed). You can then tweak this shape now or after the skirt has been made and the changes will propogate (Scale it up/down add points etc). When building geometry/curves in Maya it will set it's pivot point to the center of the world or XYZ = 0,0,0. This is the point that your extrusion
will grab your profile curve from and look at it's sweep along your extrusion path.

Pheww.

Now grab your profile curve and shift select your path or skirt perimeter curve and go to Surfaces>Extrude [OptionBox]

in here you want to pick from the top down these radio buttons:

style = Tube (now your menu options have changed! from default)
result position = at path
Pivot = component
Orientation = Profile Normal
Rotation = leave at default 0.00
Scale = leave at defulat 1.0
Curve Range = Complete
Output Geometry = Nurbs (This is up to you, you might try Polygons but can't help you more on this right now)

Now If I haven't missed something and you've followed this exactly you should now have 1 beautful skirt, beyond that of your wife/girlfriend of course.

you'll notice that the where the beginning and ending of your path are don't close properly just kinda start and stop. You can fix this now by selecting the skirts path shape and going to Edit Curves>Open Close Curves [Option Box]
This will make your 1 degree curve closed or Periodice actually. But also Might introduce Wonky kinks at that corner and this is the point that I recommend not closing this curve but simply converting this Nurbs Geom. to Polygons and using Poly Tools manually close this off. You can get this to work using a periodic curve but you really need a lot of time and understanding about parameterization and rebuilding of surfaces and curves etc.

When you eventually gain that level of understanding I thought I would add my tip which is when using Extrusions that have both linear and curved sections that need to be 1 piece; I convert that extrusion path to a Degree 2 curve which makes sharpening points easier and managing Perfect Fillet corners easier.

Hope that helps. That's gonna be my longest post of 2006!

: I HOPE!

Jason Brummett
Studio Z Inc.


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Steve Sayer
Re: Can anyone help with this.problems extruding along a path
on Feb 17, 2006 at 5:12:22 pm

Jason, an excellent and helpful series of posts--thanks for all the time and effort.

I've been experimenting with this and have run into the 'pinching' bug you described in an earlier message.

It seems that extruding around a curve which is composed entirely of 90


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Jason Brummett
Re: Can anyone help with this.problems extruding along a path
on Feb 17, 2006 at 6:43:22 pm

Glad I could help Steve.

From what I gather and this info is a bit GREY! As Maya sweeps this profile it basically runs into a gimble lock sorta problem and thats why moving a first and last CV of the curve Makes the Extrusion work again as Maya now knows the proper normal to go along. Other Apps like MAX have better tools in this area. I've brought this up to an Alias specialist and it's kinda a dirty little secret there; as in they know about it but I think to fix it would alter a lot fo the way Maya behaves (The last part is pure speculation). It's 1 of the things I doubt Autodesk will fix as it wants Maya to roll along as it did before the merger but this is 1 area Maya could learn a little bit from MAX. Oh, well. given that, those that read this will know how to conquer it and like a lot of pitfalls in Maya once you know the work around it becomes less of a nuisance. LOL.

Jason Brummett
Studio Z Inc.


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cowcowcowcowcow
Jason Brummett
Re: Can anyone help with this.problems extruding along a path
on Feb 16, 2006 at 2:08:46 pm

forgot to answer the easy question!!!

revolve your profile and in the AE set the Degree to Linear (Not Cubic) and the Sections to 4. Wah~la you have your 4 sided skirt again in much fewer steps and with a bit of poly cuting and copying can combined and duplicate pieces to create a skirt that is more than just 4 sides.

Jason Brummett
Studio Z Inc.


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kilbsy
Re: Can anyone help with this.problems extruding along a path
on Feb 18, 2006 at 11:32:25 am


Jasom,

Thank you VERY much for the time and effort you have put in to helping me with this query. It has been extremely helpful and has enabled me to continue with my work and also taught me a thing or two.
Thanks again...
Barry


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Jason Brummett
Re: Can anyone help with this.problems extruding along a path
on Feb 18, 2006 at 9:46:59 pm

My Pleasure!

Glad to help.

Jason Brummett
Studio Z Inc.


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