How The F*#% Do I Model This? - Reply for help with specific shapes - (Post attempt before asking)

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  • perna
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    perna quad damage
    @Filip5 : Exactly what is the problem, in your own words?
  • Filip5
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    Filip5 polycounter lvl 4
    perna said:
    @Filip5 : Exactly what is the problem, in your own words?
    @pernahttps://www.google.sk/search?q=alligator+armored+car+front+light&tbm=isch&tbo=u&source=univ&sa=X&ved=0ahUKEwiHtJ3XxsnVAhWDA5oKHbzWBxcQsAQIJg&biw=1536&bih=759#imgrc=M9rYi4IWdjoefM:

    Going for that front lights part. At first I wanted to use more sided cylinder and not subdivisions, as rest of the model doesnt need subdividing. And as far as I know, every face should be 4-quad or triangle. Cant get it here, so I wonder whats the best way to do this part.

  • wirrexx
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    wirrexx greentooth
    Filip5 said:
    perna said:
    @Filip5 : Exactly what is the problem, in your own words?
    @pernahttps://www.google.sk/search?q=alligator+armored+car+front+light&tbm=isch&tbo=u&source=univ&sa=X&ved=0ahUKEwiHtJ3XxsnVAhWDA5oKHbzWBxcQsAQIJg&biw=1536&bih=759#imgrc=M9rYi4IWdjoefM:

    Going for that front lights part. At first I wanted to use more sided cylinder and not subdivisions, as rest of the model doesnt need subdividing. And as far as I know, every face should be 4-quad or triangle. Cant get it here, so I wonder whats the best way to do this part.

    Filip, build the main body. (the bigger parts). Move on to the secondary part of the car (the second biggest shape). Use that as a cage before cutting holes . 

    quoting Neox

    Neox said:
    nail the shape first, subdivide for more res, do the holes. once those are locked in, you should not have to touch the shape
  • Michael Knubben
    Filip5 said:
    as far as I know, every face should be 4-quad or triangle

    *eye twitches*
  • johanflod
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    johanflod polycounter lvl 7
    Thanez said:
    johanflod said:

    Insert a loop on each of those flat rims, scale outwards until roundness is achieved. 
    Thanks for the answer. I appreciate your answer but your solution means that I should eyeball the roundness? I tried a different technique today on the small air exhaust on the gasmask. I started with a sphere. Then I selected a couple of edgeloops on the sphere. Then I did a quad chamfer on the selected lines. Then I extruded the chamfered lines. With the quad chamfer the top row had an equal distance between the segments.


  • Thanez
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    Thanez greentooth

    johanflod said:
    I should eyeball the roundness?
    Yeah why not? Use a reference cylinder and match it if you want. Whatever gets you there.

    As for that protective cap, you can totes use a sphere for it, but squash it first as it's not spherical... more like a zeppelin shape. Get good refs, study them and follow them. Nail the large shapes first, then do the details. Make sure you have enough geometry to help out the cuts you're about to do.

    I hope you have max 2017, because I did this thing but would rather just let you browse through the file than do a bunch of pics in mspaint.
    15 steps to victory: http://skins.thanez.net/help/johan_filter.max


    Notes:
    There are two main objects because I had to collapse the stack because longstack-max files like to crash on this laptop for some reason.
    There's a third object called doublesmooth method. It's a copout alternative to step 15. IDK use it if you want. Both ways create unique minor errors that won't be seen on a matte plastic material.
    About step 15, it should really happen right after step 7, but I fucked up and couldn't be arsed to go back. Bad planning right there led to me having to split off the tilable pattern, delete all but 1, do the corners of the cutout, repeat the pattern and weld it back on.
    Step 0: The cylinder side amount is a 6x multiplier because you have a six-sided circular pattern to model. I chose 6x8 because that way the bits that go from the center to the extremities gets a center edge that gives it roundness.
    Step 4: If you doubled this, the circular ribs would be rounded, and would have their own supportive geometry, so you could skip step 6 and 15. In retrospect this would be optimal.
  • johanflod
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    johanflod polycounter lvl 7
    Thanez said:

    johanflod said:
    I should eyeball the roundness?
    Yeah why not? Use a reference cylinder and match it if you want. Whatever gets you there.

    As for that protective cap, you can totes use a sphere for it, but squash it first as it's not spherical... more like a zeppelin shape. Get good refs, study them and follow them. Nail the large shapes first, then do the details. Make sure you have enough geometry to help out the cuts you're about to do.

    I hope you have max 2017, because I did this thing but would rather just let you browse through the file than do a bunch of pics in mspaint.

    Thanks a lot! number 2. the set flow step really makes sense. That makes sure you have an even distribution of the edgeloops after the squash. On step 9. array to rebuild pattern I would use the clone modifier( I am sure you are using that one as well).  The problem I have with your solution is the bits that go from the center to extremities. These bits are getting smaller towards the center in your model. This is something I wanted to avoid as they look straight in the reference. This is even more visible in the large particle filter cover. 
      
  • Thanez
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    Thanez greentooth
    after step 4, select those edges, constrain by edge, make planar by axis.
  • johanflod
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    johanflod polycounter lvl 7
    Thanez said:
    after step 4, select those edges, constrain by edge, make planar by axis.
    Instructions unclear, fingers stuck in toaster ... just joking :) 

    thanks, I definitely noticed a difference when I made them planar by axis. I left out the last row to keep the top part intact. just a quick test ( in reality I only need to make one edge planar due to the symmetry modifier etc.). It was pretty cool to notice that I can change the squish and it propagates all the way through the modifier stack.  

    When it comes to reference I have a pretty decent camera and the plan is to take photos of all the equipment I am modelling. I guess it would speed up the process to have a lot of refs on the same object. To get a correct feeling of the form. 

    I had to include a screenshot of the scene I got from Thanez . Those modifier names!

  • wirrexx
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    wirrexx greentooth
    its not perfect. but. 
    1. Main shape, sphere wit 18 sides.
    2. turbo smoothed once
    3. Added where the cuts would be (mostly deleting faces) and always working on 1/4 or 1/7 of the mesh 
    4. Rotated the copies and welded vertices. 5 minutes of work. 


  • iacdxb
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    iacdxb polycounter lvl 2
    Hi,

    24 subdivide cylinder extrude for nozzle, I know its wrong subdivide from nozzle edge. some triangles but if anyone guide me... much appreciated.

    Thanks.


    Thanks.





  • iacdxb
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    iacdxb polycounter lvl 2
    outer edges is solved... now nozzle inner have to fix hard edges....!!!

    ...
  • perna
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    perna quad damage
    @iacdxb


    To define a hard edge, simply place control edges on either side of it. This is fundamental to sub-d modeling.



  • iacdxb
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    iacdxb polycounter lvl 2
    Thanks, fixed.

    ...

  • johanflod
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    johanflod polycounter lvl 7
    perna said:
    Perna thanks for all the useful answers you have given in this thread. I would like to hear your feedback on the following idea. 



  • Neox
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    Neox sublime tool
    this will likely look bad, because you do not have enough geometry to compensate for the sharp angles coming out of the otherwise smooth surface.
  • perna
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    perna quad damage
    @johanflod

    Double the amount of segments in the cylinder and you should be fine with that approach. I use it myself a lot of the time, trying to avoid any hand-modeled control edges whatsoever. The resulting artifacts are typically too small to be noticed.

    I want to challenge you on your use of Edit Poly mods though. They are not parametric, so why leave them on the stack? That looks very questionable and likely to only lead to problems.
  • snakedogman
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    snakedogman polycounter lvl 4
    Hi all, I'm a relatively novice modeller and some time ago I thought I'd try and tackle modelling a WWII British Matilda II tank. I've made some decent progress but some shapes in the turret are giving me a headache. I am now struggling with the front of the turret ring/base which is a really particular shape. I've attached a couple of reference images and my progress so far. This actually looks allright and might be just enough geo to look good from a distance, but I'm wondering:
    A: What is a good approach to model a piece like this? (it took me a lot of time, using booleans to give me the basic shape, then moving a lot of points around manually. But perhaps this is already the best way)
    B: if I wanted to subdivide this, what would be my edgeflow around the highlighted area?

    (I know my current attempt doesn't have quite the right proportions yet, but I'm confident that if I get the approach right I'll be able to get it closer to the reference)

    https://www.dropbox.com/s/ee28i1izxufwfei/matilda%20turret%20blocking%2008b.obj?dl=0

  • Turks
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    Turks polycounter lvl 5
    perna said:

    I want to challenge you on your use of Edit Poly mods though. They are not parametric, so why leave them on the stack? That looks very questionable and likely to only lead to problems.

     Hey perna, can you expand on this a little? I'm semi-new to subd and am wondering. Do you just work on 1 editable poly, or collapse your stack as needed? How do you keep it parametric?
  • johanflod
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    johanflod polycounter lvl 7
    perna said:
    @johanflod

    Double the amount of segments in the cylinder and you should be fine with that approach. I use it myself a lot of the time, trying to avoid any hand-modeled control edges whatsoever. The resulting artifacts are typically too small to be noticed.

    I want to challenge you on your use of Edit Poly mods though. They are not parametric, so why leave them on the stack? That looks very questionable and likely to only lead to problems.
    I doubled the amount of segments but I still notice some small weirdness 

    when I zoom in see something like this.


    collapsed part of the stack. is this better?

  • perna
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    perna quad damage
    @snakedogman
    Firstly that's a tough subject. It doesn't have clean, machined shapes. I would lose hair working on something like that; you might want to try something cleaner. I've re-created your shape (not ref) with simple sub-d modeling in 3ds max using a subdivision modifier set to respect smoothing groups.

    A - cylinder primitive, 32 sides as that lines up nicely with your ref shapes (orange)
    B - inset then extrude on the bottom ngon
    C - two manual cuts (marked yellow in the second column), deletion of polygons
    D - fill the gap (shift-drag edges, target weld)

    So there's barely any manual work and consequently it's quick and the result is accurate.





    @Turks
    It might sound like a joke answer, but I leave modifiers on the stack when it's beneficial to do so. So I'm asking the above person what the benefit is of his use of "Edit Poly" modifiers.

    You could spin around and rub your belly every time you take your shoes off because someone on the internet told you that's a better way of removing shoes. But you can't do stuff just because someone (like me) says you should. You need to understand exactly why something might be beneficial to do. It's like all these people who model purely with quads. They never stop to think why, they just blindly follow some random stuff they read online. Now let's talk about religion.


  • perna
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    perna quad damage
    @johanflod
    But now you're no longer using the technique you outlined in your image.

    Here are some variations. The visual artifacts are small. You're going to get artifacts like that with any normal map bake anyway. Unless you're making a huge chrome shape you can get away with it. Never aim to make subd-meshes perfect, just aim to make them good enough for their intended purpose, otherwise you're going to waste a lot of time.

    See how messy the last mesh is, with those huge chamfers. Works just fine still.


    As for whether the new stack is better. Well, why ask me, I'm not the one working with it. Is it better for you?



  • snakedogman
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    snakedogman polycounter lvl 4
    perna said:
    @snakedogman
    Firstly that's a tough subject. It doesn't have clean, machined shapes. I would lose hair working on something like that; you might want to try something cleaner.

    You're absolutely right Perna. Of course, being a novice, I didn't realise when I started this model, it would be quite so hard.  I had started working on the body of the tank which was ok, but the turret is rather a challenge, since it's this weird, cast iron shape. Then again, if we don't set ourselves some challenges, how do we grow eh? ;) But thanks a lot for the example, I'm gonna study it!
  • Turks
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    Turks polycounter lvl 5
    perna said:

    @Turks
    It might sound like a joke answer, but I leave modifiers on the stack when it's beneficial to do so. So I'm asking the above person what the benefit is of his use of "Edit Poly" modifiers.

    You could spin around and rub your belly every time you take your shoes off because someone on the internet told you that's a better way of removing shoes. But you can't do stuff just because someone (like me) says you should. You need to understand exactly why something might be beneficial to do. It's like all these people who model purely with quads. They never stop to think why, they just blindly follow some random stuff they read online. Now let's talk about religion.


    haha that makes sense. That's a practice I've tried to follow when making anything in any medium. Just was wondering if you had any specific wisdom to impart particularly about the parametric aspect. Didn't mean to set you off, jk ;) 
  • johanflod
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    johanflod polycounter lvl 7
    perna said:
    @johanflod
    But now you're no longer using the technique you outlined in your image.

    Here are some variations. The visual artifacts are small. You're going to get artifacts like that with any normal map bake anyway. Unless you're making a huge chrome shape you can get away with it. Never aim to make subd-meshes perfect, just aim to make them good enough for their intended purpose, otherwise you're going to waste a lot of time.

    See how messy the last mesh is, with those huge chamfers. Works just fine still.


    As for whether the new stack is better. Well, why ask me, I'm not the one working with it. Is it better for you?



    There are a few modifiers I would keep in the stack like turbosmooth, chamfer, shell and clone. Having two edit poly modifiers on top of each other does not make sense and I would merge them. Leaving the cylinder modifier at the bottom is like asking for trouble. You change the amount of sides on the cylinder and you break everything above. I added the turbo smooth modifier ( with separate by smoothing groups checked )  before the chamfer to quickly test if more subdivisions would make the form hold up better. Why am I no longer using the technique outlined in the image? 
  • iacdxb
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    iacdxb polycounter lvl 2
    @johanflod
    Hi, try this as mine.... Its without any pinch, and I am sure there will be other ways.

     



  • johanflod
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    johanflod polycounter lvl 7
    iacdxb said:
    @johanflod
    Hi, try this as mine.... Its without any pinch, and I am sure there will be other ways. 



    To get rid of the pinching you could do like you did yes. I would prefer a non destructive method if possible. Will do some more experiments. 
  • perna
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    perna quad damage
    johanflod said:
    iacdxb said:
    @johanflod
    Hi, try this as mine.... Its without any pinch, and I am sure there will be other ways. 



    Yes to get it perfect you need to do as you did. 
    Could either of you guys show how that's supposed to be perfect? Also, what happened to using the chamfer modifier?
  • johanflod
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    johanflod polycounter lvl 7
    perna said:
    johanflod said:
    iacdxb said:
    @johanflod
    Hi, try this as mine.... Its without any pinch, and I am sure there will be other ways. 



    Yes to get it perfect you need to do as you did. 
    Could either of you guys show how that's supposed to be perfect? Also, what happened to using smoothing groups?
    Perfect is the wrong word from my side and I changed it. Communicating over the intrawebs demands the right words at all places :)  I meant that @iacdxb did not have any pinching in his solution. I would still prefer a non destructive method. 
    I did an experiment with the standard chamfer(instead of the quad option in the modifier)  and smoothing groups. 




  • perna
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    perna quad damage
    @johanflod
    here are both your topologies. The results are almost identical. If you're getting pinching it's not because of the topology but because you're keeping control loops unnecessarily close together in the areas marked in purple.

    Be wary of spending time chasing the perfect solution with subd. Also keep in mind that with the chamfer modifier, since you're not making control loops manually (and spending ungodly amounts of time doing it), it's often irrelevant how dense your base geometry is, so you could in this case use 64 or however many segments for the cylinder.



  • [Deleted User]
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    [Deleted User] insane polycounter
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  • Noors
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    Noors polycounter lvl 10
    Maybe his assets are use by sculptors or whatever. Considering he's at ILM, i guess they know their workflow.
  • somedoggy
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    somedoggy greentooth
    That's what I figured as well. It could also conceivably be helpful to have such regularized meshes when it comes to texturing and shading with their internal tools, but I'm taking intuitive pot-shots.

    Damn if they aren't some beautiful examples of quadrangulated meshes though.
  • [Deleted User]
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    [Deleted User] insane polycounter
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  • Justo
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    Justo greentooth
    Hey there, saw this shape and tried doing it. Posting here to see if I'm going in the right direction or if the answer is easier somehow. 


    -So I make the base shape (colored object) with booleans and edge bevel
    -Manual tweak by deleting edge (white arrow) and smooth using chamfer+SGs.

    Trying to be nitpicky, I say that looking at it from the top , the bevel width isn't consistent, as it thins around the circular edge. I know I could get acceptable results by manually tweaking that too, but I'm starting to think there must be a more mechanical approach to this piece...

    Per would maybe suggest to use the Catmull-Clark principle of subdivision to mathematically get the roundness right, but I struggle to figure out how to do that without needing to eyeball verts.   
  • perna
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    perna quad damage
    @Justo, a few questions for you:

    -Exactly why did you choose that intersection point between the box and cylinder shapes?
    -Exactly why did you remove those white arrow edges?
    -Exactly why did you use booleans?

    Whether or not you have since reconsidered your approach, it would be great if you could answer those questions as to your original motivations.
  • somedoggy
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    somedoggy greentooth
    Noors said:
    Maybe his assets are use by sculptors or whatever. Considering he's at ILM, i guess they know their workflow.
    Aw yeah they probably using that secret ILM sub-d...
    tbf there are benefits to quads in film

    sculpting is a valid point
  • perna
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    perna quad damage
    Sculpting is not specific to film and you may well make the argument that they try to avoid dense meshes more than we do.

    There's no mystery here. Film and games are the same; both use final rendered meshes which are very clean, with an orderly distribution of geometry so they can be put through animation and fx.

  • [Deleted User]
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    [Deleted User] insane polycounter
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  • Justo
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    Justo greentooth
    Hi @perna

    -I'm worried I'm not getting you with this question. I picked an 8 sided cylinder for the boolean operation because I thought the number of sides aligned the best with my borders. 
    -I actually first did the shape with those white arrow edges. Just before I was about to post it here, and answering your question, I thought to myself the subd cage would be better without it, since less is more flexible/easier to work with. I also tried making the shape with two edges for the circular sides, but thought 3 would be the best balance. 
    -For the beginning shape? I thought it the fastest way to get me the object I wanted to smooth. Is there a faster approach you can think of?

    Thanks for your time in teaching us all man.
  • perna
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    perna quad damage
    "he works at ILM" is not enough but if there's some special circumstance in that process that must eliminate ngons I'd like to know.  To me if you sub-d any ngon twice you get quads anyway.
    Once ;) Read my reply. We don't use ngons, so there's no reason why film should. You want to avoid shading errors, unresolved UVs, animation issues, etc.
  • perna
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    perna quad damage
    @Justo , just to clear up the first question: The intersection point is where the two boolean operators line up. So the question is - why did you decide to make the subtraction exactly there, as opposed to a bit to the left or right or whatever.
  • [Deleted User]
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    [Deleted User] insane polycounter
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  • somedoggy
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    somedoggy greentooth
    perna said:
    Sculpting is not specific to film and you may well make the argument that they try to avoid dense meshes more than we do.

    There's no mystery here. Film and games are the same; both use final rendered meshes which are very clean, with an orderly distribution of geometry so they can be put through animation and fx.

    Right, I was just meaning that the clean meshes are useful for sculpting since they can be passed over to the animation teams easily (and back and forth between teams) without needing further retopo.

    @TeriyakiStyle Ptex works just fine with ngons and triangles, which I checked after making that post suggesting possible texture benefits. It would actually be fine, other than this next point.

    It is definitely better to have mostly quads for consistent displacement with subdivision at render time. High end renderers will often subdivide adaptively based on pixels, and having too irregular meshes with strong displacement maps will result in visible jumps in displacement quality. This can also impact how quickly and cleanly the render converges.
  • perna
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    perna quad damage
    @TeriyakiStyle

    No, you sub-divide once, you get all quads. The exceptions are theoretical and do not show up in production unless intentional, or say with exceptionally bad meshes.

    You say you don't suffer ill effects from your use of n-gons, but you don't work in film. I already explained what the quad situation is like in film, but you feel that's insufficient information, or?

    Another thing I'm curious about - you said the cage meshes you linked to above are not to be missed, but I'm only seeing extremely simple shapes there, along with inconsistent, manually made control edges and part intersections you'd not get away with in AAA games. No complex curve intersections or information to help people with their struggles in this thread. Maybe I'm missing something?
  • [Deleted User]
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    [Deleted User] insane polycounter
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  • perna
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    perna quad damage
    But you also said there's no difference from games or film.  
    No, here's the complete sentence:
    Film and games are the same; both use final rendered meshes which are very clean, with an orderly distribution of geometry so they can be put through animation and fx.
    So why can't an ILM guy use ngons?  What's the quad situation in film?
    This has already been covered. Clean meshes are more versatile and perform better for animation (including FX). Again, why is this explanation insufficient for you?
    I know what problems ngons can cause if used incorrectly but it seems like bad advice just to say - don't ever use them.
    What's the correct use of ngons? Quads, yes, triangles, yes, but ngons? I've never seen any use of ngons in games, and I understand why they wouldn't want them used in film. So both industries agree and everything seems fine, except from your view.
    But whatever I'll just continue to squeak by with my nasty meshes!

    How do your game spec hipoly meshes become "nasty" by not following (irrelevant) standards in film?
    As far as the examples - Thought they were nice examples people learning to model would be interested to see.  But this thread is pretty typically hostile I'll just try and help elsewhere.  
    People not saying what you want them to and challenging or questioning your statements is not hostility, it's a common social situation which can be dealt with gracefully. It's been explained to you why clean in-product meshes are necessary, but you seem to refuse to accept that information and it's not clear why. I've tried patiently to understand your view, asking questions, and I've provided my own view and understanding. That doesn't warrant a dramatic exit.

  • NoRank
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    NoRank triangle
    For real, I actually like when a model comes at least clean the way it was presented, even if someone used some "useless" effort doing that by hand. Because hell how I hate to get a model that I simply can't work with, and that happens all the time.

    I know that many times you don't need to do any manual work, and by not doing that you can benefit of using parametric stuff to make changes easly, but I would rather see a decent model done by hand than a bad one made by someone who doesn't even know how to build a decent topology and just used some booleans and nurbs and called it done.
  • philipp.bogdanovskiy
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    philipp.bogdanovskiy polycounter lvl 5
    Oh maya setting was making triangles with the open edges in my smooth setting. So yes one sub-d makes quads from ngons or tris.  

    I don't suffer ill effects from ngons - and I dont work in film.  But you also said there's no difference from games or film.  So why can't an ILM guy use ngons?  What's the quad situation in film?  I know what problems ngons can cause if used incorrectly but it seems like bad advice just to say - don't ever use them.  Better for people to know why they are bad and why you can bend the rules in rare cases (imo)  But whatever I'll just continue to squeak by with my nasty meshes!

    As far as the examples - Thought they were nice examples people learning to model would be interested to see.  But this thread is pretty typically hostile I'll just try and help elsewhere.  
    Usually, if particular asset is a static prop, or won't be involved in sim, it might get away with being decimated mesh for example. Some render engines use render time subdivision, so the mesh is better be quad and clean, especially if it's a foreground asset. Others may handle huge polycounts in a single scene, so the mesh density is not an issue.  

    As long as you can UV your mesh properly, you are half-way there with a static asset. As for sim and fx, it usually depends on a type of simulation you're doing. If you're using mesh as a fluid source, it doesn't matter what topology it has, it just better to be airtight. If it's RBD's, there might be certain criteria you'll have to fit.
  • Justo
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    Justo greentooth
    perna said:
    @Justo , just to clear up the first question: The intersection point is where the two boolean operators line up. So the question is - why did you decide to make the subtraction exactly there, as opposed to a bit to the left or right or whatever.

    Because generally, whenever I try to do boolean ops with objects that have faces that coincide, sometimes the operation will create bad, super thin faces that force me to just delete the whole area and bridge/cap. So I guess I've grown used to avoid that, and prefer to just bool stuff that doesn't snap exactly at the same places. Would you disagree with this?

    In any case, tried what you said and voila, no super thin faces were created and it seems to me it looks good enough.


    However, I had to eyeball some stuff, and I wanted to ask if I'm just doing it wrong. I'm talking about the bevel, which, much like moving verts along their normal axis/Push modifier, behave badly with complex shapes. Thus, I eyeball the corners:



    I don't know if the bevel moves verts using the same formula as Pushing, where it's multiplying the vertex coordinate by a number, and by the avegare vertex normal direction, and maybe what I'm having trouble with is mathematically not possible?
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