Digital Art Zone

 
   
3 of 5
3
Boolean in Carrara or Hexagon or am I a fool?
Posted: 12 September 2012 02:29 PM   [ Ignore ]   [ # 31 ]
Member
Avatar
Rank
Total Posts:  92
Joined  2003-10-09

Group hug!!

Image Attachments
group_hug400.jpg
Profile
 
 
Posted: 12 September 2012 02:34 PM   [ Ignore ]   [ # 32 ]
Power Member
Avatar
RankRankRank
Total Posts:  1104
Joined  2007-10-15

And to give you a basis of comparison, I re-did the faceplate using the same boolean operations (in Hex), UV mapped it, and exported to Carrara, and it took right around 4 minutes. A little longer. Although I always get messed up with Hex booleans because you have to go into faces mode, not object mode before you boolean, or it thinks you’re generating a spline or something. Always messes me up.

Anyway, like I say, it mapped fine, renders fine, and is pretty quick. Though Carrara converts the big n-gon generated by Hex into a million triangles, which is messy but it works.

Image Attachments
Faceplate2.jpg
Profile
 
 
Posted: 13 September 2012 02:06 PM   [ Ignore ]   [ # 33 ]
Power Member
Avatar
RankRankRank
Total Posts:  1825
Joined  2004-08-24

Of course, you can do any modelling you want in Carrara. The question is, when faced with a modelling task, what’s the best way to go about it?

That’s exactly why is I’m saying that a Boolean operation is NOT the “Best” way to go about it.
also that for someone “new” to modelling, it’s not a good first option to choose boolean.

You’re convinced that, in this case, a boolean is not the way to do it. No real reasons given, just a statement. I gave many reasons why your method is no better than a boolean.

I posted two examples images of how it can be done using the software the customer asked about. not an alternative modelling software.

If you look at the examples I’ve posted on the first page , you’ll see there are NO ngons. and that seems to be the main reasons you gave for not using one of the options I suggested, yet in your own attempt to prove yourself right, in Hexagon , by using a Boolean, you note that ....

Though Carrara converts the big n-gon generated by Hex into a million triangles, which is messy but it works..

 

Messy but it works isn’t very good at all.  not Professional. and not clean modelling, therefore , not good advice.

I showed an example of how a boolean can work fine for what he wants, and it UV maps okay and renders okay, and can be done very quickly. You discard all that and stick to your guns. That’s fine, and what I expected.

Your example has a Flat Colour shader,
Q: how does that show that it’s UV mapped, or will texture correctly, ?

The same can be done in Carrara, and will result in an equally messy model, which can also be shaded and rendered.

The question wasn’t “what’s the fastest method”, it’s What’s the “best” method.

I don’t work for DAZ, and I have no need to steer everyone to solving their problems in Carrara. Apparently you do.

No,. I DO NOT WORK FOR DAZ-3D again you make hugely inaccurate assumptions about me, and you question my integrity and the reasons I post advice here.

I don’t get paid by anyone to come here and I DO NOT offer advice for any reason other than furthering peoples knowledge.

Well, except for expecting people to do it in an external vector drawing program.


The advice to import an AI or EPS file is an “OPTION”, and it applies in 3D software throughout the industry.

The spline (vector) shapes can be created just as easily within carrara,. as the OP has already done.

Importing an AI, or EPS is an “optional”  method , mostly used when you’re using technical drawings from a client, and it’s also a short-cut for someone without much direct modelling experience.

I’m sure you’re not seriously suggesting that by using external image editors or drawing programs that it’s somehow wrong to do so, or wrong to make people aware of that option.

Again, that’s fine. But that’s no need to discard some very well thought out and presented information on modelling technique that professionals use and consider, and instead make blanket statements that everyone else is wrong.


I didn’t discard anything,. I contradicted the advice to use Booleans as a “first approach” and I gave clear examples and screen shots of HOW it can be done within the software which the OP asked about.
I also expanded on the modelling advice to include how it can be done using Carrara’s shader functions, (alpha channel) rather than by modelling.

I made no “blanket statement” where I said “everyone else is wrong”.

Like I said, in some cases, such as this, there is no “good” or “ideal” way to do it. It’s a very difficult mesh to generate cleanly and without n-gons and other somewhat undesirable polygons.



I disagree, there are indeed good and ideal ways to model cleanly,. but if you don’t learn them, you’ll never use them.

Here’s an example of how simple it can be in Carrara, using a vertex grid, deleting some polygons, and using a simple extrusion.
Note that I’m showing the base Mesh here, and there are absolutely no unwanted Ngon’s being created using the extrusion method.

Image Attachments
holes1.jpg
Profile
 
 
Posted: 13 September 2012 02:41 PM   [ Ignore ]   [ # 34 ]
Power Member
Avatar
RankRankRank
Total Posts:  1104
Joined  2007-10-15

Okay, Andy.

You’re right, and I’m wrong. Sorry for questioning you.

Profile
 
 
Posted: 13 September 2012 03:55 PM   [ Ignore ]   [ # 35 ]
Active Member
Avatar
RankRank
Total Posts:  383
Joined  2008-08-29
3DAGE - 13 September 2012 02:06 PM

Thanks for providing level headed advice, I appreciate it.

 Signature 

Swamp Living Never Felt So Good

Profile
 
 
Posted: 14 September 2012 05:26 AM   [ Ignore ]   [ # 36 ]
Power Member
Avatar
RankRankRank
Total Posts:  1825
Joined  2004-08-24

Thanks Thoromyr smile

Joe smile Don’t stop questioning. .. asking questions is how we learn.

Profile
 
 
Posted: 16 September 2014 09:19 PM   [ Ignore ]   [ # 37 ]
New Member
Total Posts:  10
Joined  2008-12-28

I always use Illustrator to create any complex shapes. The drawing capabilities in Carrara Pro I can’t say it lags, but the coordinates are made for the 3D world.  And Illustrator if you have it is a lot faster for creating 2D shapes in layers then saving in Illustrator 3.0.

Profile
 
 
Posted: 17 September 2014 03:43 PM   [ Ignore ]   [ # 38 ]
Member
Avatar
Rank
Total Posts:  37
Joined  0

Hey roygee,

Let me add a few ideas to your technique.

1.  Draw your hole shape.
2.  Fill the shape with a poly.
3.  Add thickness.
4.  Scale the extruded shape to extend out past the original like you suggested.
5.  Pick points along the sides that would form a practical group for one of the box edges, select the appropriate drawing plane, and send the points to the drawing plane.  That gets them all aligned.  Move those points back to the place where you want the box edge to be.
6.  Do that for the other three edges.
7.  Make adjustments on the edge points as necessary.
8.  Select everything and send that whole mess to the appropriate drawing plane to flatten it.
9.  Empty out the original shape to make the hole.
10.  Select everything and add thickness to make the box with the cool hole (poof!).

Very much coolness!

Profile
 
 
Posted: 17 September 2014 09:54 PM   [ Ignore ]   [ # 39 ]
Member
Avatar
Rank
Total Posts:  37
Joined  0

I also should have mentioned to empty out the stretched poly after step 4.

Profile
 
 
Posted: 17 September 2014 11:05 PM   [ Ignore ]   [ # 40 ]
Power Member
Avatar
RankRankRank
Total Posts:  1549
Joined  2008-01-01

Goodness me - that is so complex and long-winded!

We in Hexagon use a far simpler method:-

1. Draw the shape of the hole/circle
2. Fast extrude - yes, in Hexagon we can extrude polylines to form shapes!
3. Square off the edges by selecting verts along one side, make size on X axis 0 repeat for other side, repeat for top and bottom by making size on Y axis (or simply drag on the scale box of the universal manipulator) .
4.  Use multiple copy tool to make as many replications as needed, with offset.
5.  Weld
6.  Add thickness.

The equivalent in Carrara would be to draw a circle/shape, copy/paste, scale up the copy and use ruled surface to join.  After that follow 3 to 6 above.

One day I’ll manage to figure out how to calculate the offset for replications in Carrara so that the copies fit exactly edge-to-edge - Hex does this automatically.

Cheers smile

Profile
 
 
Posted: 18 September 2014 12:32 AM   [ Ignore ]   [ # 41 ]
Power Member
Avatar
RankRankRank
Total Posts:  1334
Joined  2003-10-09

No one brought up negative metaballls   shock

wink

 Signature 
Profile
 
 
Posted: 18 September 2014 04:55 AM   [ Ignore ]   [ # 42 ]
Power Member
Avatar
RankRankRank
Total Posts:  1549
Joined  2008-01-01

No one brought up negative metaballls   shock

wink

I wonder why…:)

Another method that is handy in certain conditions is “fake boolean”...bridge opposite faces.  Clean, quick and simple smile

Just to add to what I wrote above.  If you have a complex shape which has convex and concave edges, the method I mentioned will not work - you’ll get cross-over polys.  In this case, boolean is a good option.  Carrara automatically triangulates the N-gon, so no problem there and all renderers understand tri’s.

You’ll have a problem if you need to bevel/fillet and such.  You could spend the next week sorting out the topology, or take it into Blender and use the remesh tool to instantly convert everything to equally spaced quads.

May as well do the whole thing in Blender - it’s spline tools are nothing short of magic smile

Profile
 
 
Posted: 18 September 2014 10:45 AM   [ Ignore ]   [ # 43 ]
Power Member
Avatar
RankRankRank
Total Posts:  1334
Joined  2003-10-09

I’m just a hobbyist, but it seems the circle hole is being made more complicated than it needs to be. 

In Carrara, just insert a cylinder with one section, select the outside ring, extrude beyond the circle, then use symmetry to select vertical and horizontal sides and scale to zero to make a box or rectangle as desired.  Delete circle and add thickness.  No ngons, no fuss, easy to uvmap. Could start with an oval instead of a cylinder if you don’t mind an extra step.

For multiple holes, use duplicate and weld as described by Roygee.  For gaps more complicated than circles, Wendy and Andy provided straightforward options.

Edit - this is very similar to Kixum

Image Attachments
cylinder_to_hole.JPG
 Signature 
Profile
 
 
Posted: 18 September 2014 02:20 PM   [ Ignore ]   [ # 44 ]
Active Member
Avatar
RankRank
Total Posts:  392
Joined  2006-02-03

Then there is the ‘no modeling’ hole method - using the ALPHA channel in the “Texture Room”.  smile

Image Attachments
alpha_hole.jpg
Profile
 
 
Posted: 18 September 2014 02:59 PM   [ Ignore ]   [ # 45 ]
Power Member
Avatar
RankRankRank
Total Posts:  1549
Joined  2008-01-01

Good one there, diomede - I never knew that you could extrude edges in Carrara smile

Of course, with that method, you have the residual of the cylinder to delete - otherwise pretty much the same as other methods.

You could also extrude the ring of faces instead of the edge and after deleting the inner face, bridge the edges.

Shows that there are many ways to skin the same cat!

And don’t go calling yourself “only an amateur” - most of us here are smile

Profile
 
 
   
3 of 5
3