Grouping and welding thin objects

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Grouping and welding thin objects // New Users

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Post by Rafa // May 11, 2009, 9:05pm

Rafa
Total Posts: 95
pic
Hi guys.


I have 2 separate objects but they are not solid, they are like 2 halfs of an egg shell, (this is one)

http://www.otake.com.mx/Foros/TSMMC/EggShell.jpg


so the bolean operation dosen't work.


Just grouping is not enough, its evident in the rendering becouse the normals, so I need to weld the surfaces.

http://www.otake.com.mx/Foros/TSMMC/EggShell-2.jpg


What can I do? :(

Post by TomG // May 12, 2009, 1:38am

TomG
Total Posts: 3397
First question is why you made them this way, it puts you in an awkward spot!


You will need to do some manual work here. You could maybe form a bridge between the edges using Form Polygonal Bridge. Or maybe you can add internal faces and use those to make a bridge, if it works only on faces.


Alternatively, you can move them close but not touching and try and connect vertices together with Add Edges (may need to add a face in the gap first if its possible).


Either way you end up with an extra "layer" or loop of faces. You could then use the Weld tool to join the vertices together. You'd likely then need editing, though, to reposition everything how you like it.


It's unlikely Boolean Union is going to work to fuse such a shape together unless you are guaranteed each vertex is in the same place as the corresponding one on the other object (which looks like might be the case here, if you split one object off from the other in the first place). And even then it might not like it. You could try variations on the tool, such as Merge Geometry, rather than just Union, you might get lucky!


HTH!

Tom

Post by clintonman // May 12, 2009, 6:01am

clintonman
Total Posts: 304
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I would boolean merge the geometry, get the vertices of the 2 halves close together and then use the heal vertices tool. This should work if the 2 halves geometry already lines up.

Post by Rafa // May 12, 2009, 9:15am

Rafa
Total Posts: 95
pic
Ok, I'll study the options, thanks.


First question is why you made them this way, it puts you in an awkward spot!

:D

The problem is that ists an imported object and its separated into this objects.

Post by TomG // May 12, 2009, 9:39am

TomG
Total Posts: 3397
Aha, so no say in the matter there! Hopefully one of the approaches below will do it for you, and hopefully automatically with just a click or two. Let us know how it goes.


Thanks!

Tom

Post by Rafa // May 13, 2009, 11:20am

Rafa
Total Posts: 95
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:o He, he. I can't find the heal vertex tool. I'm on model side. Can you give a clue?

Post by Jack Edwards // May 13, 2009, 12:16pm

Jack Edwards
Total Posts: 4062
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The boolean merge and vertex heal tools are workspace side.

Welding meshes on model-side can be unstable and cause it to crash. An approach you can try is to group the two parts and use the MeshCollapse plugin. Then position the two halves so they line up and use the weld tool to weld each set of vertices one by one.

Post by clintonman // May 13, 2009, 1:51pm

clintonman
Total Posts: 304
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The boolean merge and vertex heal tools are workspace side.



Welding meshes on model-side can be unstable and cause it to crash. An approach you can try is to group the two parts and use the MeshCollapse plugin. Then position the two halves so they line up and use the weld tool to weld each set of vertices one by one.

To this I would add that you can right click the weld tool and try welding with Coincident Weld checked. That way you could avoid welding each set of points one by one.

Post by Rafa // May 13, 2009, 2:28pm

Rafa
Total Posts: 95
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Ok, it took a little to figure out but It worked.


1) Model Side > Bolean > Object union

2) Workspace > Right click to configure Heal Vertex, I reduced the heal radius to .001 (It triangulated the quads before with .05:mad:) but I figured out.

3) Left click Heal vertices.

4) On model side again it looks one surface now.


Thanks.

Post by Jack Edwards // May 13, 2009, 4:08pm

Jack Edwards
Total Posts: 4062
pic
In my experience, the workspace Boolean Merge tool is safer than the model-side boolean union.

I'm glad you got them merged! :)
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