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digitalphaser  
#1 Posted : Friday, April 27, 2018 6:57:16 AM(UTC)
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Hi,
Today I received another surprise. I wanted to connect two surfaces. I used Ruled and Loft Surfaces with same result. Unfortunately, gaps formed between the surfaces. This eliminates the possibility of stitching or joing model.

Why is everything so hard?
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Tim Olson  
#2 Posted : Friday, April 27, 2018 12:49:20 PM(UTC)
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Looks like the ruled surface is inverting . Try splitting the curve along equal lengths and making two ruled surfaces. See attached.

Tim
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digitalphaser  
#3 Posted : Friday, April 27, 2018 1:42:52 PM(UTC)
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Originally Posted by: Tim Olson Go to Quoted Post

...Try splitting the curve along equal lengths and making two ruled surfaces...


Thank you Tim. Looks good. But if I could understand what you mean. :)
MPSchmied  
#4 Posted : Saturday, April 28, 2018 3:15:02 AM(UTC)
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Originally Posted by: Tim Olson Go to Quoted Post

Looks like the ruled surface is inverting . Try splitting the curve along equal lengths and making two ruled surfaces. See attached.

Tim


Nice Model, i tried to use the Shell Feature for testing, it works not and cause a error message.
digitalphaser  
#5 Posted : Saturday, April 28, 2018 1:20:32 PM(UTC)
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As for the above, I did not understand how to do it.

Next, I want to ask how to close this hole? It is a common task for every CAD software. How is it done with Shark?
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Tim Olson  
#6 Posted : Saturday, April 28, 2018 2:10:28 PM(UTC)
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>> i tried to use the Shell Feature for testing,

The shell would need to be done before the slightly offset faces or do "manual" shelling as in the attached.

Some steps for manual shelling for this part might be...
--Remove the detailed faces with Deep Select/Delete or Remove Face
--Shell Simple Model
--Change Object Type Surfaces/Remove outside surfaces
--stitch into a volume (represents the hollow volume)
--Remove from original volume
--Create Opening (offset curves, extrude solid, subtract)


Tim

Edited by user Saturday, April 28, 2018 7:09:52 PM(UTC)  | Reason: Not specified

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digitalphaser  
#7 Posted : Saturday, April 28, 2018 2:33:39 PM(UTC)
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If I were a genius, I would have guessed it myself. ;)

Tim, did you notice that the hole is not round? I already noticed it for a long time. I quite often create similar models. Often after shelling remains O-shaped or oval opening.

Edited by user Saturday, April 28, 2018 2:39:39 PM(UTC)  | Reason: Not specified

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Tim Olson  
#8 Posted : Saturday, April 28, 2018 8:33:24 PM(UTC)
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>>I want to ask how to close this hole? It is a common task for every CAD software.

I noticed you did a cover with guide for the hole surface. A couple of requirements to get the cover with guide surface to work as planned.

1. The guide needs to start with the first profile. Do a Verify : Show Direction to see where your guides start.

2. The guide needs to intersect the profile. If it does not, it is ignored.

You can also check to see if your guide/profile intersect using Verify : Min Distance. If it comes back with anything over then zero something needs to be tweaked.

The three maganeta curves needed to be slightly modified to produce a cover that used all the profile and guide curves.

Tim

Edited by user Saturday, April 28, 2018 8:55:00 PM(UTC)  | Reason: Not specified

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Tim Olson  
#9 Posted : Saturday, April 28, 2018 8:47:50 PM(UTC)
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>>I want to ask how to close this hole?

When possible, I let intersections fall out from smoother underlying surfaces. When necessary, I over extend the surface to get an intesection. This might invalidate your design intent so apologies in advance. Using that method, I did the following.

--untrim the large red surface to get a smooth under surface
--split back to the centerline
--update the profile curves to fall on the guide curves
--create new cover with guide
--linear extend the profile curves to create a cover that intersects the red surface (resolve links)
--split red with blue, and blue with red, get rid of extras

Those steps get you the image on the left.

I deleted the blue surface and then created a loft to get the image on the right. The image on the right has G1 continuity with the red surface if that is needed.

Tim

Edited by user Saturday, April 28, 2018 8:57:24 PM(UTC)  | Reason: Not specified

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rockyroad_us  
#10 Posted : Sunday, April 29, 2018 1:47:47 PM(UTC)
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Originally Posted by: digitalphaser Go to Quoted Post
As for the above, I did not understand how to do it.

Next, I want to ask how to close this hole? It is a common task for every CAD software. How is it done with Shark?


I would have done it different.

1. explode the pointed hole on the red surface. You'll get a boundary. Then,
2. do a cover with guide and use the first oval which is closest.
3. do another cross surface with the first oval going across to split the created surface made with the guide.

After that you can do the rest of the surfaces using your curves, which is much easier.

One thing I've learned through out the years in shark that all curves have to touch at best with using a point at their intersection. This avoids any gaps that the engine introduces.

Edited by user Sunday, April 29, 2018 1:50:39 PM(UTC)  | Reason: Not specified

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digitalphaser  
#11 Posted : Monday, April 30, 2018 5:55:42 AM(UTC)
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Originally Posted by: Tim Olson Go to Quoted Post
>>I want to ask how to close this hole?

When possible, I let intersections fall out from smoother underlying surfaces. When necessary, I over extend the surface to get an intesection. This might invalidate your design intent so apologies in advance. Using that method, I did the following.

--untrim the large red surface to get a smooth under surface
--split back to the centerline
--update the profile curves to fall on the guide curves
--create new cover with guide
--linear extend the profile curves to create a cover that intersects the red surface (resolve links)
--split red with blue, and blue with red, get rid of extras

Those steps get you the image on the left.

I deleted the blue surface and then created a loft to get the image on the right. The image on the right has G1 continuity with the red surface if that is needed.

Tim

Thank you Tim. Yes, I used the same technique too. With round smooth shapes this works well. But how to do it in the case with drop-shaped hole? I can not imagine it.
digitalphaser  
#12 Posted : Monday, April 30, 2018 6:05:50 AM(UTC)
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Originally Posted by: rockyroad_us Go to Quoted Post
Originally Posted by: digitalphaser Go to Quoted Post
As for the above, I did not understand how to do it.

Next, I want to ask how to close this hole? It is a common task for every CAD software. How is it done with Shark?


I would have done it different.

1. explode the pointed hole on the red surface. You'll get a boundary. Then,
2. do a cover with guide and use the first oval which is closest.
3. do another cross surface with the first oval going across to split the created surface made with the guide.

After that you can do the rest of the surfaces using your curves, which is much easier.

One thing I've learned through out the years in shark that all curves have to touch at best with using a point at their intersection. This avoids any gaps that the engine introduces.


Yes,it looks great. Initially, I also experienced this method. I wanted a more controlled surface on the top. Probably this way was wrong. I always got a fold in this place.
Can you please attach Shark file too? Thank you!
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digitalphaser  
#13 Posted : Monday, April 30, 2018 6:30:42 AM(UTC)
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After a huge number of trials and errors, I decided to complete this model in any case.

So. Working with surfaces is not very intuitive, complex and unpredictable. If I have successfully completed one step, this does not mean that I succeed the next step.

And I decided to use the simplest methods.
I created a base bottle with drop-shaped "grooves". Then I worked fast only with a solid body. But even Boolean operations were not always successful.
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digitalphaser  
#14 Posted : Monday, April 30, 2018 6:58:53 AM(UTC)
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Yes, model is not very smooth.:) At the moment, it does not matter. I tried to explore the possibilities of surface tools. But with some things I obviously failed.

1. I would like a more smooth rounding of the edges.
2. The shape of the handle does not correspond to my ideas.
3. I would like that a convex surface seamlessly connected to the handle.
4. The created model is too complex for shelling. I would like more flexible solid utilities.

Of course, for printing or visualization, this model can be improved with another software. But it costs even more time. I'm not sure I want to start a similar model with Shark. Although I learned a lot. Maybe I'll experiment more. :)
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rockyroad_us  
#15 Posted : Monday, April 30, 2018 7:24:08 AM(UTC)
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Originally Posted by: digitalphaser Go to Quoted Post


Yes, it looks great. Initially, I also experienced this method. I wanted a more controlled surface on the top. Probably this way was wrong. I always got a fold in this place.
Can you please attach Shark file too? Thank you!


To use all the curves and avoid the dink or fold mentioned, you will need to create another curved along the yellow dash line you drew. That's the only way I can think you can control that fold.

From the looks of your recent pics, it seems you got the hang of the approach I took.

You asked about using different values for the blends, that's possible. There's a feature called variable blend at positions. It should work.

Regarding the seamless area you want, I don't think that's possible because the design won't allow it. You would have to approach that area just like the tear drop peak and leave a bridge. I think that's what you mean.

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digitalphaser  
#16 Posted : Tuesday, May 01, 2018 5:14:25 AM(UTC)
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Originally Posted by: rockyroad_us Go to Quoted Post
Originally Posted by: digitalphaser Go to Quoted Post

To use all the curves and avoid the dink or fold mentioned, you will need to create another curved along the yellow dash line you drew...

Yes, just this part was always problematic. Would you be able to attach your SFX file? Please. This way looks the most accurate.
Originally Posted by: rockyroad_us Go to Quoted Post

From the looks of your recent pics, it seems you got the hang of the approach I took....

I took an easier way. Simple Cover with Guide and then stitch to solid and boolean operations. But it was not exactly too. Although the combination of curves looks correct.
Originally Posted by: rockyroad_us Go to Quoted Post

Regarding the seamless area you want, I don't think that's possible because the design won't allow it...

I think that it is still possible. I already saw something like this(I like to watch video about modeling with different CAD software:))). If blending tool worked more flexibly, it was possible to smooth out many transitions between surfaces.
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