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1. — В 3ds max есть готовый персонаж и его маппинг UVW’s. Для того, что мне его разукрасить экспортирую модель в формат .OBJ для Mudbox.
Так вот…. основная модель видимо не экспортируется — пишет — warning — rats nest in mesh.
2. — При импорте файла в Mudbox выпадает ошибка, что мол НЕ ХВАТАЕТ ПАМЯТИ или ФАЙЛ НЕ СУЩЕСТВУЕТ!
…
Кто поможет? Какие еще крысы в сетке??
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Просмотров: 1 103
Да не нехватает памяти. А про крыс — это просто прикол про то, что сетка имеет незакрытые полигоны и дырки, проеденные крысами. Типа сетка дырявая и в ней размножаются крысы. Ни чего страшного, у меня так часто ругается.
Да не нехватает памяти. А про крыс — это просто прикол про то, что сетка имеет незакрытые полигоны и дырки, проеденные крысами. Типа сетка дырявая и в ней размножаются крысы. Ни чего страшного, у меня так часто ругается.
И что же делать с памятью то подскажите?
Ну, мудбоксом не пользовался — не знаю. Например, в збраш всегда все импортировалось нормально.
А у вас вообще низкополигональная модель — памяти тут не хватать не может в принципе. Это какой-то косяк мудбокса, скорее всего.
Это всё фигня. Просто когда импортируете модель нужно проверить на дырки (да) и на пересечения граней, например модель может быть построена иделаьно, но две грани пересеклись (где нибудь на веках например) и всё, мудбокс в ауте. Ещё может быть что где-то какой-то полигон стоит не той стороной, его нужно флипнуть. А если модель у вас такая что в ней предусмотрены дырки и прочие издевательства, тогда в мудбокс лучше вообще её не пихать — подавится.
насчёт нехватки памяти — это просто Мудбокс так реагирует на русскоязычные пути в имени файла, просто переместите его куда-нибудь в корень диска С
Cleaning Geometry «Rats Nest In Mesh»
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May 18, 2022 2:27 p.m.
Hello,
I am cleaning up photogrammetry with the poly doctor, clean sop, and a poly fill node. I am outputting valid topology from the poly doctor, then I export out of Houdini into 3ds Max and when I export out of Max it says I have a «rats nest» in mesh. Can anyone guide me how to find «rats nests» in a mesh in Houdini and remove them procedurally?
Vincent Griffith
Edited by VGriffith — May 18, 2022 14:35:37
May 19, 2022 5:49 a.m.
Hi VGriffith
I remember having lots of these when i was doing photogrammetry.
If i’m not wrong, it was because of tiny holes with intersecting geometries, and i used to fix them in zbrush, smoothing out that area and maybe using a combination of dynamesh and zrememsher.
I believe that to do that procedurally you could convert them to VDB, and convert them back to polygons.
Not sure if you need to keep that original topology intact though.
Doing this would make you lose your original UVs, but you can still bake it back after.
May 19, 2022 11:58 a.m.
It all depends on what the issue is
The description «rats nest» is very vague and not informative
Is it max telling you you have garbage geo but doesn’t bother specifying the actual issue?
It can be anything
— non manifold edges (including flipped polys, overlapping polys)
— duplicate vertex attachments
— degenerate primitives
— isolated points
— almost zero area prims
— intersections
— probably something else
Without your geo it’s difficult to pinpoint what your specific issue is
Edited by tamte — May 19, 2022 12:00:16
Tomas Slancik
FX Supervisor
Method Studios, NY
May 19, 2022 12:12 p.m.
tamte
It all depends on what the issue is
The description «rats nest» is very vague and not informative
Is it max telling you you have garbage geo but doesn’t bother specifying the actual issue?It can be anything
— non manifold edges (including flipped polys, overlapping polys)
— duplicate vertex attachments
— degenerate primitives
— isolated points
— almost zero area prims
— intersections
— probably something elseWithout your geo it’s difficult to pinpoint what your specific issue is
Yeah I wish Max would say what part of the geometry is actually messed up. It literally just says «Rats Nest in Mesh» and leaves it vague like that. lol! It is so beyond frustrating. I was hoping on the Houdini end there was ways of combating all the issues you were listing with the poly doctor or some node like that so 3ds Max would shut up! lol! I would love to upload the geometry but I am not allowed to.
May 19, 2022 12:26 p.m.
VGriffith
I was hoping on the Houdini end there was ways of combating all the issues you were listing with the poly doctor or some node like that so 3ds Max would shut up!
There is a way for sure
But as I said you have to identify the issue first to be certain you are using the right nodes to fix it
Tomas Slancik
FX Supervisor
Method Studios, NY
May 19, 2022 12:30 p.m.
tamte
VGriffith
I was hoping on the Houdini end there was ways of combating all the issues you were listing with the poly doctor or some node like that so 3ds Max would shut up!There is a way for sure
But as I said you have to identify the issue first to be certain you are using the right nodes to fix it
Yeah it’s tuff to find out the issue when it is a pile of triangles. Needle in the hay stack stuff. I will figure it out and report back.
May 19, 2022 12:38 p.m.
VGriffith
Needle in the hay stack stuff
But you have Houdini so if you know you are looking for a needle you can find it
It’s only tough if you don’t know what to look for
maybe start with the things I listed
Or if you manage to export subset of your geo that still happens to be a «rats nest» and can post it here it may be easier
Edited by tamte — May 19, 2022 12:38:39
Tomas Slancik
FX Supervisor
Method Studios, NY
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Today I will write about this little tiny thing that I encountered this very afternoon. I was working in 3ds Max on a lovely toilet model (3D pooper ftw!) and as I attempted to export an .OBJ file I got this crazy warning message saying that there is a “rats nest in mesh “Water”. Yap. That’s the official name for the warning – the rats nest 😀 which I find to be pretty amazing and clever 🙂 It doesn’t say anything more than this. So I had to figure out what the problem was.
Rats Nest warning – The name is self explanatory
As you can presume the name for this “rats nest warning” is self explanatory. If you think of a rats nest your first association would probably be messy, tangled, crowded place… Well, actually if you got this error, I am sad to tell you but your mesh that got this export warning is truly tangled and messy at some degree. And you need to do something about it, cause these things can cause you funny looking renders or even worse angry customers, if you are planing to sell your exported model in any 3D stock portal. So better to fix it right up.
Check Overlapping vertices, Edges and Polygons/Faces
So I got this warning because I somehow f*cked up my “Water” mesh (inside my toilet mesh), which was made from 24 vertices (yeah, from whole model I messed up the mesh that you can’t even call a mesh really, true talent I am…). So anyways, The solution is to check your mesh for Overlapping Vertices! I checked the Open Edges and overlapping Faces too (check picture below on how to do it) . So I got 2 overlapping vertices and one huge overlapping face in my mesh 😀 😀 yap, don’t know how that happened in a mesh of 18 polygons… but I have my mysterious ways I guess 🙂 I am very glad that 3ds Max is such an advanced program that it caught such a mess in a first place and informed me about it in a very stylish way, a very witty way of saying that you f*cked up somewhere along the way 🙂
Fix Your overlapping vertices, Edges and Faces
see the image bellow to see how to check what is overlapping in your scene.
So after checking all of the overlapping/open things in your mesh, weld all of them (select vertices, Right Mouse Click and choose Weld). After welding I advise you to check your mesh again with the xView. If xView shows that there still are some green areas on your mesh after inspection, check everything once more. If all is good you should be able to export your .OBJ file without any rats nest in it 😉
So that’s it. I hope this small tutorial-ish post was helpful. I am glad I got to fix my “pooper” and to get rid of rats nest in it! Thanks for reading my blog! Have A Happy Nice Week People 🙂
P.S. You can download this 3D Toilet model for free from Cgtrader ►►►HERE◄◄◄ and take a closer look on Sketchfab ►►►HERE◄◄◄
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Rats nest after 50 layers
Rats nest after 50 layers
I have printed many things successfully, but recently I’ve had prints fail, consistently, after around 50 layers. (I don’t think the number of layers is relevant.) As you can see in the photo, the bed adhesion is fine. But at some point it starts extruding in air and producing the rats nest.
I do see some extrusion that appears to be discolored (burnt?) but not very much.
Any idea what is going on?
BTW… PETG using the Prusa PETG profile and 0.15mm SPEED
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Posted : 24/02/2021 4:18 pm
(@dan-rogers)
Noble Member
RE: Rats nest after 50 layers
Hard to tell from the pictures — you’re saying that nothing broke loose from the bed and the head just started printing out in the middle of space? Under those circumstances — have you ever printed this thing in the picture successfully before? Not knowing what the shape eventually looks like, is it failing when printing a massive bridge?
I can see some globbing — and that burnt stuff had been stuck to the nozzle and eventually globbed down into the mess. Somewhere the head is plowing into plastic to build up a glob like that, or possibly over-extruding. Any signs of warping where parts of the print slowly eased into the air — that’s a common cause of nozzle starting to plow into prior extrusions.
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Posted : 24/02/2021 5:30 pm
Topic starter
answered:
RE: Rats nest after 50 layers
Actually, after posting this, I checked with the creator of the model and they say that even with supports this is extremely difficult to print. So, I guess I’m no longer surprised that it fails.
Nonetheless, I’d like to know what is the mechanism for the failure? What is actually going wrong? Anyone know?
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Posted : 24/02/2021 5:32 pm
Topic starter
answered:
RE: Rats nest after 50 layers
@dan-rogers
Thanks for the message, Dan.
The model has some slender elements that go up at a 45 degree angle from the bed. I suspect that if these weren’t so slender, it would be more successful. As it is, I suspect that the thin leading edge is indeed warping and that is causing the collision with the head and subsequent mayhem.
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Posted : 24/02/2021 5:36 pm
(@dan-rogers)
Noble Member
RE: Rats nest after 50 layers
Try adding a brim. Skinny parts that are long have a hard time with cooling of upper layers putting torque on the layer stuck to the bed. Increase the bed touch surface area with a brim — I’d suggest 3 or 4mm. It should be able to handle the 45 degree angle no problem. You can help in that area by adding
extra perimeters if needed (advanced)
detect bridging perimeters
And I like to slow down the bridge speed by 5 or so. With these settings I can get decent bridging at crazy angles.
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Posted : 24/02/2021 5:56 pm