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Old 26-09-2006, 01:55 AM   #1
Hyperyon
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Default Drawing curves on shapes.

Can I turn on a curve sub-object mode in Maya? I want to create curves on shapes like in this 3dsmax tutorial....

http://www.tutorialized.com/tutorial/Make-a-Face/14814
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Old 26-09-2006, 03:48 AM   #2
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just make the surface 'live'

chose the surface and go modify make live

then draw on it
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Old 26-09-2006, 04:34 AM   #3
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Phew, that was easy. Thanks!
But now, how can I make the drawn curves or polygons modify the shape whenever I modify them? For example, like pushing them back in the shape or leave holes on surfaces with the form of their shapes when deleted. :bow:
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Old 26-09-2006, 06:53 PM   #4
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I know this can be done with nurbs when construction history is on (little scroll on the status line). You can make a poly surface live to draw on it, but I don't think you can use construction history to modify the curve by altering the poly surface. If anyone knows a way, please explain.

For simplicity:

1. open a new scene
2. create a nurbs sphere
3. modify -> make live
4. use cv curve tool to draw any quick curve shape on the sphere
5. edit curves -> offset -> offset curve with a distance of 0 (or more than 0 for the general idea)
6. move this new curve +5 in y
7. don't delete history
8. make not live
9. select the sphere then go into cv mode (f9) and move some cv's around then notic the offset curve change due to the history
10. once you get your curve in the shape you want, make sure to rebuild it to either 0 to 1 or 0 to #spans.
11. you can also adjust the curve on the surface which will automatically rebuild the offset curve. You will still need to rebuild when you have what you are looking for.

You may lose a little shape when you rebuild but you can usually get back pretty close to your origonal.

I hope that is as clear as mud. pm me if I can help anymore. If you already knew all of that, sorry
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Old 26-09-2006, 07:42 PM   #5
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That was very clear. Thanks!
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Old 26-09-2006, 07:52 PM   #6
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.... but something is not going like I wanted. When I try to move the curve I drew on the sphere, it just moves on the surface... I want it to act like an edge so I pull and push it. I guess that works on polygons? Also, I have one more thing im trying to figure out if you can help pls.:blush:
I created a polygon sphere, made it live and drew another polygon on it using the create polygon tool and extruded it a bit.
How can I push that polygon shape into the polygon sphere and leave a gap behind?

Sorry if I'm beig a handfull... Theres a big road block in what i'm trying to do.
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Old 27-09-2006, 06:04 PM   #7
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I was under the impression that you wanted to use a surface to control a curve. I am now thinking you are wanting to have on poly surface nicely next to another, is that right?

If so, you can duplicate your first object, hide it. Then do the same with you second object. Use a boolean operation then try to use the split poly tool to make sure you stay all quads. Move that new piece of geometry just out of the way then unhide your surfaces. Do another boolean but in the opposite order then use split poly to ensure quads.

What is it you are trying to make? Do you have a screenshot (that would help)?

If anyone else is thinking of a better way, please chime in.
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Old 27-09-2006, 08:43 PM   #8
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Sorry, maybe I can explain better using this image.



How can I attach that polygon star onto the polygon box then be able to push in the star and leave a gap in the box?
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Old 27-09-2006, 10:43 PM   #9
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Here is something quick and crude. If this is all you need, then it should do. If you need to be able to smooth or bevel edges, then the geometry will need to be redone but shouldn't be a problem.



Let me know.
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Old 27-09-2006, 10:51 PM   #10
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Quick render

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Old 28-09-2006, 01:39 AM   #11
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Thats it! How did you leave that star hole in the shape? Nice render btw
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Old 28-09-2006, 03:02 AM   #12
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You are going to kick yourself when you see how simple this is

That was one of my problems when I first started also, just over modeling everything. I can either send you a scene file that I exported or write a .txt on how I did it. Let me know.
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Old 28-09-2006, 03:08 AM   #13
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Yeah I presumed it would be easy hehe...If so, ill appreciate a .txt please.:bow:
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Old 28-09-2006, 03:17 AM   #14
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1. create the star with the create polygon tool (you've already done)
2. create a poly cube (again, done)
3. I used the poly split tool to get the star so that each face was a quad.
This took a minute of staring at it to get the idea for the
topology but it's not that bad.
4. In object mode, select the star then use the extrude face tool.
5. The extruded geometry should have faces on both side (also make sure you have keep faces together selected)
6. Once I had the depth I wanted, I just moved the star so that it intersected the cube.
7. Select the cube, then the star; then do a boolean difference (maybe selected them in the other order??? can't remember)
8. Render to your heart's content.
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Old 28-09-2006, 03:20 AM   #15
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Aaaah! That was cake!:attn: Thanks again.
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