3-d solids of complex shapes

[chrman]

I need to create a 3-d solid model for output to a stereolithography machine. My problem is that i cannot use the simple shapes that autocad limits 3-d solids to. My shape is very complex and cannot be recreated with rotations and union of other objects.
The shape i am reproducing is of an underground orebody. I was trying to create a 3-d mesh of the profile and then extrude it to simulate the shape but it keeps giving me errors saying it is unable to perform that operation. I am at a loss and a deadline is approaching. Any tips/hints are appreciated.
What is the best way of creating a complex 3-d shape then extruding it to become a solid? I have a wireframe already done but cannot figure out a way to change that shape into a solid.

 

[tigrek]

Rhino3D is what you need.
See the evaluation download URL on our Rhino Forum (eng-tips).

You make irregular or organic like or gravel like shapes in Rhino very quick, then save them as dwg for Acad.

 

[chrman]

I downloaded the demo of rhino and did a couple of tutorials. It looks like a great program.

Quick question though, do the rhino models import into ACAD as a solid? Is there a special type of format i should be working with? I assume so but i want to be sure before i do a lot of work.

Also, would rhino allow me to import my current wireframe, transform it into a solid, then go back to ACAD? The only goal of this whole project in the end is a stereolithography compatible output. (for that matter does Rhino handle STL files? maybe i can skip ACAD altogether)

 

[tigrek]

Yes Rhino saves directly as STL (as well as 30 or so other file formats including IGES, DXF etc)
My opinion is that soon STereoLito will become synonimous with Rhino3D.

If 2D drawings with lots of text and dimensions are not needed (for reasons of tradition - though function does not need them), then Rhino to Desk Top modeling (3D-printing, StereoLit) is just beautiful.

It is like a vision of Henry Ford come true: the story is that Ford protesting against the cost of 2D drawings be more than the cost of his prototype auto, replaced the design department with one skilled carpenter and replaced the 2D drawings with wood models.

Hope this is useful