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Old 5th January 2008, 12:16 PM   #1
Greasetattoo
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Default Need a little help with polylines..

Ok, well, I've been working on this for the last couple of days and pulling my hair out! (I actually don't have any hair) I read all the posts I could find...

Ok, what I am trying to do is make a guitar.
I have the photo of the guitar as my background image.
I pick the polyline tool, I've also tried the polygon tool.
I outline my guitar.
When I use the polygon tool my guitar goes all black.
It started out white, then as soon as I cross a line, when I am tracing, it goes black. The final outline does not have any overlaps. I just happened to overlap while I was tracing, because the way the guitar is shaped.

When I use the polyline tool,
I outline the guitar, go into vertex mode, pick all the vertex.
Create a 2d mesh. Then I go to delete some surfaces that the
2d mesh made and my model is black in some spots and won't extrude correctly.

My final trace would not have any overlaps or anything like that.

I even tried it with a simple drawing. I drew (polygon tool) a octagon, kinda. Picked the object in surface mode. Tried to extrude, but it would'nt! I am so confused, here..
I must be missing something.



What would the correct steps be to:
1. Trace a object (like a guitar)
2. Then surface it.
3. Then extrude it with caps on both ends.

So simple, but I am not comprehending...
I think in one of my steps, it is leaving behind vertex or something.

Grease
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Old 5th January 2008, 01:08 PM   #2
Greasetattoo
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Default Re: Need a little help with polylines..

Well, I've been playing around here.

I drew some polylines and made the surface type poly.
Extrudes fine...

I drew the outline of my guitar and when I click on poly, BOOM, it turns all black. I just don't understand.

I even drew a somewhat shape of the guitar without the background image and this time it worked. I clicked on poly and I did'nt get the all black, it was white this time. Extruded fine.

What the heck is going on here. Sometimes it works, sometimes it don't. I am totally confused.

thanks
Grease
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Old 5th January 2008, 01:25 PM   #3
Greasetattoo
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Default Re: Need a little help with polylines..

Well, I though I had one that worked.
Now, when I go to move a vertex, my object turns all black...

See picture below...

thanks all!
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Old 5th January 2008, 02:49 PM   #4
luuckyy
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Default Re: Need a little help with polylines..

All your troubles might be solved by triangulating your mesh.
If you don't want to triangulate it, then make if of quads (or a mix of quads and tris) manually.
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Old 5th January 2008, 06:31 PM   #5
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Default Re: Need a little help with polylines..

Along with the triangulating, you can divide and recombine the surfaces (after triangulation). Triangulating, dividing, and recombining, in my experience, has about an 80-90% success rate.
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Old 5th January 2008, 11:03 PM   #6
Greasetattoo
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Default Re: Need a little help with polylines..

Captain,
Well, it worked...
I triangulated the model, then divided.
Worked.
But, when I went to combine, boom, back to black.

I read in the manual:
If after combining surfaces, the new surface appears black from every angle, this means that the first three vertices of the surface form an angle of more than 180 degrees. To prevent this, the vertex order must be changed (Surface->Change Vertex Order) so that the first three vertices of the surface form an angle less than 180 degrees.

I did what it said (Surface->Change Vertex Order).
But that did'nt work.
So, would I have to move the first 3 vertices, manually?
How do I know which are the first 3?

Thanks for all the help...
Grease
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Old 5th January 2008, 11:33 PM   #7
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Default Re: Need a little help with polylines..

I don't know about that. Does it necessarily need to be one surface only? You could just combine pieces instead of everything.
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Old 6th January 2008, 12:15 PM   #8
Greasetattoo
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Default Re: Need a little help with polylines..

Well, I wanted the guitar to be one surface.
Then I wanted to bevel around the edge of the guitar.
Right now, I have the model, but when I go to bevel, it bevels
every face.
See attached picture...

I tried to combine to one surface, again, I get all black..
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Old 6th January 2008, 12:21 PM   #9
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Default Re: Need a little help with polylines..

Well, I went and combined the front surfaces in pieces and it seemed to work. (instead of picking all the front surfaces at once)

No black....


I'm Happy!!!
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