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Solid jaggies


Tim Nelson
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I'm suprised i haven't had this problem until just now...I'm trying to file link a curved solid from Autocad, and no matter what settings I seem to try, I keep getting really bad mesh problems. If I use autosmooth, it still doesn't look good.

 

I turned down the surface deviation as low as possible and it still isn't coming in right.

 

Any ideas? Thanks.

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Hi Fran! Long time no see. You must be busy at the Maxwell forum.

 

It doesn't seem to matter what auto smooth settings, or acis settings I use - the mesh always gets messed up in one way or another. It's not just a faceting problem. It's producing really strange triangulation problems, especially at the edges.

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Actually, I just go over to the Maxwell forum to socialize mostly. :) I'm really busy trying to make it so that I can take some time off this summer.

 

Can you post a screen shot of your import settings? Do you get a different result if you import instead of link?

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Here are my link settings. I tried importing too, but same results. The smaller the surface deviation, the more jaggies I get at the edges.

 

I tried a couple of options in autocad too (facetres, isolines) but didn't seem to make a difference.

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Would it create a problem by being too large, or too small. The object you are seeing the in screenshot is one solid, that is overall about 80' wide with a thickness of 2'. I've had similar sized & shaped objects before without problems. Maybe this one is different though because of the way i created it.

 

It was originally a spline that I offset by 2' and then revolved 360 degrees to create my solid. Then I created some tapered triangular shapes and subtracted them from the main solid.

 

This is what the shape looks like in autocad...

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80' wide with a thickness of 2'[/Quote]

 

So to make sure scaling is correct, do as Gaston said - move it to 0,0,0 in AutoCAD (insert as an Xref in a new drawing and import that one), then setup the System Units in MAX to 1.0 Inches, and when Linking/Importing, enable "Rescale Units" and Feet should automaticaly be enabled if your DWG was correctly setup. This will convert 80' to Inches in MAX, creating a sizable model and should reduce the problems.

 

Hope it helps,

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Hi Tim

This kind of problems always frustrates me and punish those who dont model directly in MAX/VIZ. Its a matter of not giving up, spending a few more hours and learning how to do it right. Lets admit it - an object like that is a walk in the park for any average MAX/VIZ modeler.

But since the problem exist, and since I run into similar problems, I'll try to offer some ideas instead of only preaching:

1.Try to keep the original objects, and make the boolean inside VIZ, or

2. Try to make some part of the geometry in VIZ, or even bring in profiles to trace over in VIZ.

3. Heard lots of good stuff about imported complex geometry managed with Power solids plugin http://www.npowersoftware.com/solids/solids.html

Good luck

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Thanks Itzik,

 

I'm glad to know I'm not alone! This is the first time I've ever tried to model something with solids that is this complicated w/ curves, so I'm not surprised it's giving me problems within Viz. I'm getting better at modeling withing Viz/Max, but I'm not quite at the level of creating something like this in it yet, so for now I might just have to deal with it. Fortunately, this isn't a real project - it's for the competition, so I have already changed my design to something that I can more easily handle.

 

I bet there is a way to import this into Viz without problems like this & I just haven't figured it out yet. It would still be good if somebody could find a way around this for future reference.

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Leme tell you Tim - this is far from being even close to complicated - and that wasnt meant to make you feel bad. Give it a try in VIZ with the same technique you used in ACAD. Just import profiles and location of final dome within your design.

Years back (ARCH school), professors didnt allow us to use computers cause they didnt want us to give up on our design ideas...

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Don't worry I don't feel bad. I know it's a relatively simple object. It's just that I've never made a 'solid' object like this before and thats why I'm not surprised it's giving me problems. I've heard really bad things about booleans in Max too and would be hesitant to take the time to try it - I can't remember if its a problem specific to Vray or just a problem with any GI renderer...Not a big deal right now since I have moved on to a different design.

 

I can understand why your teachers wouldn't let you use computers. Sometimes it is a great design tool, and other times it is a hinderance - especially for people like me who tend to think in straight lines. I suppose in a way its similar to drafting techniques. In college they made us learn board drafting long before we started cad. It was supposed to help us stop and think about what we were drafting instead of just drawing lines on a computer screen.

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