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Facets on curves

SOLVED

Re: Facets on curves

Have you tried opening an STL in DME?

Play with the settings. It all depends on the units and the overall size but you can come up with some good levels. If you don't know, just make a series of files to test out how they look when you import them into the STL nesting software.

Re: Facets on curves

Doesn't seem so. I hit save, and then a progress bar shows.

Here are my filesize results for a hollow bar that measures approx 25cm x 1cm x 4 cm (numbers refer to Distance and Angle values):

1) 0.5 / 0.05 = 3,731,460kb!

2) 0.5 / 0.1 = 3,731,460kb!

3) 0.5 / 1 = 46,746kb

4) 0.5 / 5 = 513kb

5) 0.5 / 20 = 513kb

6) 0.3 / 0.8 = 566kb

7) 0.5 / 0.8 = 60,884kb

So clearly 1) and 2) are absurd, but what I don't understand is that filesizes for these two, plus 4) and 5) are exactly identical; I thought that changing the values would gradually increase the filesize.

Anyway, I'm guessing the 0.5 / 0.8 is the smoothest without being ridiculous.

When I open this one up though, on various surfaces, I can see lines fanning out from a single points; they have no rhymn or reason on the way the object is modelled, so am assuming the are ghost lines and won't be present on the end machined piece. Is this a safe assumption?

Thanks everyone for your help so far

Re: Facets on curves

Very nice. In a previous discussion we noticed that some STL algorithms take into account the orientation of the part in consideration of the STL process. I do not know if Modeling Express does this or not.

Having triangles fan out from a point is no big deal. It has to map triangles somehow, even it is it a flat surface.

I might opt for the shorter distances over the smaller angle. The 3) 0.5 / 1 is a nice target also.

Re: Facets on curves

We had a recent discussion about triangle orientation on stl files.

Here is the product suggestion as a result.

http://communities.ptc.com/ideas/2614

Here is a link to the discussion itself

http://communities.ptc.com/message/202484#202484

Thanks, Dale

Re: Facets on curves

That's odd. There are tons of free STL viewers but both PTC products DME and PVE do not allow you to view them. You definitely want to get yourself a viewer. You want to know what you are sending to the shop for growing parts.

I'm not endorsing these guys but here is one you might consider:

http://www.solidview.com/Products/SolidViewLite