Silhouettes with Hidden Geometry Off

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Re: Silhouettes with Hidden Geometry Off

Postby medit » Tue Apr 06, 2010 11:28 am

Well, first thanks for all your replies,

Thomthom,
your method works ok, but ... do I have to edit each group, then select each line in that group and then in the entity info box of each line select all the lines that I want to hide for each particular view? .. because if I want a different view and I rotate my point of view then it won't be those edges that I've edited the ones that will define the "silhouette" of the rounded corner and I'll have to start again.

So my question is if there's some way that Sketchup can automatically "detect" what the are the silhouettes for each view and then show up only the boundaries just like AutoCAD do? .. if you have a curved solid in AutoCAD, like a cylinder, you can tell it to show x lines per surface (which would be those dashed and dotted lines in SketchUp) or simply to show the siolhouettes per solid and surface independently of what is your XYZ position and from where you're looking at the solid...

these captions show the AutoCAD method: first one without the silhouettes and 4 "contour lines per surface", the one with 20 (that actually don't show the silhouette), and then one with only the silhouette and 0 lines "inside" the geometry of the solid --- that's what I was asking if it's possible to do with SketchUp, because it would do the most basic hidden line rendering that I'm looking for (and that AutoCAD, as far as I know, can't do... in fact, if someone knows if AutoCAD can do that type of renderings tell me how...)





Anyway, what AutoCAD won't do will be to "emulate" a hand rendering WITH silhouettes and that's why I turned to SketchUp... but if for every view i have to personally edit each curved solid and define its boundaries by hand it will take me hours with a medium/large model.


Chris, Mitcorb,
thanks for you suggestions but I'm not sure what I'm doing wrong: if i select a whole group and use the eraser with crtl or shift it just don't do anything, and if i select a group, edit it, and then select line by line with eraser + crtl it just don't do nothing either... of course without the crtl pressed it delets the whole group.
And still I don't quite understand the difference between a dashed line and a dotted line... but I just want them to disappear not to be smoothed/softed (it seems that check or uncheck the smooth/soft only turns dotted lines into dashed lines?)

Sorry if I seem a bit dumb but it's my first time with SU... and, this silhouettes problem aside, it's really a fast, flexible and great piece of software!

Thanks again.
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Re: Silhouettes with Hidden Geometry Off

Postby Chris Fullmer » Tue Apr 06, 2010 4:10 pm

I'll try to make a video showing how to do it today. The point is that SU DOES automatically find the profile edges to display by default when you turn on profile edges. The only time it does not show them is when YOU hide the edges. That overides the profile showing. The point is?, don't ever hide lines. I know it is confusing at first between hidden and smooth, but once you see the difference, it all makes sense. Anyhow, I think a video will go a long ways to explaining it. Its really rather simple.

Chris
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Re: Silhouettes with Hidden Geometry Off

Postby medit » Tue Apr 06, 2010 5:36 pm

great, thanks Chris...

meanwhile here's another example... I don't see how with the profiles ON I could solve my problem...

these are actually cones, also done with AutoCAD... their silhouettes, now with hidden geometry OFF and profiles ON in the View menu, does not show..



then I turn hidden geometry on still with the profiles on (so now there's nothing hidden).. now I see the silhouettes but I don't want the "auxiliary" lines (the dotted lines)



so i select one of the cones and click on soften/smooth edges



the box starts with the slide at 0 degrees (so the lines are dotted)



and I move the slide to the 180 degrees (and now the lines are dashed including the base of the cone which I want to keep as a continous line)



since this does not do what I want, i edit the group of that cone and open the group... I select some of the lines and click on entity info.. i unhide them (that I don't understand: how it is they were "Hidden" if i have the Hidden geometry ON in the view menu?)



so now i close the group and back to the view menu, i uncheck the hidden geometry and those six lines appear...



... but those are not the silhouettes for that view, so i move the camera until one of them "become" one of the silhouettes of the cone...



So, what I'm missing? I can't do that for every single curved solid in the model and for any new point of view!
Chris, if you really can do a small tutorial for this particular problem I would be very grateful,
thanks
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Re: Silhouettes with Hidden Geometry Off

Postby Chris Fullmer » Tue Apr 06, 2010 6:00 pm

ok, here is a video that shows a few things. I tried to make a shape similar to your lights cones.

I show how to unhide all the edges. Then they will show up as profile edges. The bottom ring of edges had not been "smooth" already, so they show up as dark black. I use the eraser tool + ctrl to smooth them. notice they disappear, but still show up as profile lines.

I hope this begins to help, sorry there is no audio. I don't have my mic with me at the moment.

Chris
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Re: Silhouettes with Hidden Geometry Off

Postby mitcorb » Wed Apr 07, 2010 12:36 am

@medit:
Way up there in the post you said:
"Chris, Mitcorb,
thanks for you suggestions but I'm not sure what I'm doing wrong: if i select a whole group and use the eraser with crtl or shift it just don't do anything, and if i select a group, edit it, and then select line by line with eraser + crtl it just don't do nothing either... of course without the crtl pressed it delets the whole group.
And still I don't quite understand the difference between a dashed line and a dotted line... but I just want them to disappear not to be smoothed/softed (it seems that check or uncheck the smooth/soft only turns dotted lines into dashed lines?)"

In this paragraph you said you selected the group and then tried to use the Ctrl+Eraser method. After you select the group, you must either right click and select Edit Group(or Component) and then do the Ctrl+Eraser (or top menu Edit> select Edit, go to bottom of drop down menu> Group(nn in model)> Edit Group at top of fly out menu. If it does not respond, then- do you have "nested" groups/components? That is, are they groups within groups? If so, you can explode the inner group, or right click and edit the inner group.
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Re: Silhouettes with Hidden Geometry Off

Postby medit » Wed Apr 07, 2010 2:08 pm

At last! thanks a lot Chris... so now i know how to "fix" a single curved solid.

Still I would like to know if there's some way to do this for several solids at one time. Because if I select diferent cones -or diferent solids in general- then I can't "edit" them as a "group" and do the that routine just one time.

In the end, I suppose there's no way that SU can do that automatically as I shown with the AutoCAD options menu, right? It would be nice if in future updates they could implement that feature. For bigger models with dozens of curved solids it will take days to "fix" each cone, cylinder, etc., manually.

Mitcorb,
thanks, now it works (I didn't use the Edit group prior to the eraser-crtl...)

Thanks everyone for your help.
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Re: Silhouettes with Hidden Geometry Off

Postby thomthom » Wed Apr 07, 2010 2:23 pm

I made a little script for you: viewtopic.php?f=323&t=27496
Converts all hidden edges in the model to soft & smooth edges.
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Re: Silhouettes with Hidden Geometry Off

Postby medit » Thu Apr 08, 2010 4:00 pm

Oh, wow... thanks Thomthom that plugin works fantastically well!! :D

This forum is great. You all people rock! :thumb: Thanks a lot!
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Re: Silhouettes with Hidden Geometry Off

Postby ypfzbbz » Wed May 26, 2010 5:28 am

thanks
:lol:
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