Rhino users

[STRAT]

Hi guys

 

any one use a combination of Rhino and autocad here that can give me some advice please?

[Wojciech Klepacki]

Hi STRAT,

What kind of info would u like know? Please, specify.

rgds,

Wojciech Klepacki

[STRAT]

ah! great! thanks for any input Wojciech

 

well there's a rhino user in work here who's just been given a rhino seat. and we want to import his rhino models into Autocad, viz and C4D.

 

but because rhino is a nurbs based modeller we're having diffuculties exporting rhino meshes cleanly, ie, making sure all verts and edges matchup PERFECTLY.

 

There's like gaps between roof and roof edge (fascia) for instance.

or like where a continuous curved wall sits directly on top of another curved wall which has doors punched out of it - the verts on the 2 walls along the meeting edge line dont exactly meet up, leaving gaps.

 

i have no rhino knowledge, but if it's similar to 3d facing and sline modelling in general i'd say it's because he's not generating the nurbs surfaces off the same corresponding splines. am i right or completely wrong?

 

here's a small piccy to illustrate -

 

[Wojciech Klepacki]

Hi STRAT,

Hmmm... I don't know C4D, but if u want to import Rhino files to AutoCAD please use ACIS SAT files. Then in AutoCAD choose: Insert -> ACIS file... works perfect. Dont use DWG format, it can't produce valid AutoCAD Solid, DXF has a lack of accuracy same as 3DS. And that is all for AutoCAD. But for Viz u have 2 ways:

a) use IGES format. Sometimes works well sometimes produces weird effect. Circles import bad. U have to divide circle into 2 arc, then close it as polyline. Aften (after import) u have to flip some normals. Pleae be careful with this metod. U MUST prepare well your Rhino file befor export. There is no one unique way to do this. Some experience is required. Look at AutoCAD section: http://www.cgarchitect.com/cgi-bin/ultimatebb.cgi?ubb=get_topic;f=17;t=000099

b) use Power Solids Translator from nPower Software, here is a direct link: http://www.npowersoftware.com/. Usualy works perfect, but it's not cheap.

Ufff... thats all for now. If u have aditional question feel free to ask. If u want some examples write me.

rgds,

Wojciech Klepacki

[STRAT]

cheers m8

 

we're on the case

[Ernest Burden III]

You also have some very good polygon mesh controls in the output dialog for .dwg from Rhino. These control how the NURBS will be translated to polys. You can have it do mostly quads, control their aspect ration, min and max edge lengths, all from the advanced menu. You can also just pull the detail slider up and down for more basic control.

 

These can also be done manually to the model, leaving the NURBS and creating meshes via the polygon tools. That way you can experiment within the program, not just as an output parameter.

 

I agree with the ACIS suggestions, but I personally use the meshing (though I don't use Rhino very much).

[Wojciech Klepacki]

Originally posted by Ernest Burden:

You also have some very good polygon mesh controls in the output dialog for .dwg from Rhino. These control how the NURBS will be translated to polys. You can have it do mostly quads, control their aspect ration, min and max edge lengths, all from the advanced menu. You can also just pull the detail slider up and down for more basic control.

Actually u r right Ernest, but using DWG Export in Rhino requires some experience. If u haven't got one u can achieve weird results and low accuracy.

rgds,

Wojciech Klepacki