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Paper wrapping a bottle


gutster

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Hey people,

A client of us asked us if we could remodel a glas bottle that is wrapped with paper, something simular like that:

two-wine-bottles-standing-on-260nw-57285

 

From my understanding a cloth sim is basicly useless because fabrics /= paper. So besides having a base mesh and sculpt the wrinkles into the geometry, is there another good way of creating that deformation?

Greets and thanks in advance

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I'd vote for sculpting and/or displacement too.

If you've got access to any reasonable photographic gear... you might want to consider physically wrapping a suitable bottle (job expenses etc : ), then unwrapping it and photographing the wrap when flat. That might give you some useful reference, and also might be useful as a secondary bump / displacement on top of any sculpt. 

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It's the hardest type of deformation to get for most DCC apps, and the question of how best to do thin paper comes up time and time again.

 

I have recently seen an incredible white paper on some emergent technology that specialises in the simulation and crumpling of paper and wraps like this, and does it majestically, but obviously that is a way off from actual implementation in anyone's software !

 

And so yes, for now I am forced to agree that the best result we can get with the current tools is some combination of hand modelling, sculpting and texture work.

 

I will call out the magnet tool / relax-mode smooth deformer technique as being something that can probably help with this if the geo is dense enough - although it tends to produce wrinkles that are rounder than you would ideally want for this, it can get folds and creases realistically tight, which might be a suitable starting point for any subsequent sculptings.

 

CBR

 

 

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16 minutes ago, Mike A said:

I'd vote for sculpting and/or displacement too.

If you've got access to any reasonable photographic gear... you might want to consider physically wrapping a suitable bottle (job expenses etc : ), then unwrapping it and photographing the wrap when flat. That might give you some useful reference, and also might be useful as a secondary bump / displacement on top of any sculpt. 

 

Now that you said photography, this COULD be done with photogrammetry! The model itself would probably be not too usable, but as a reference for retopology it could work pretty great.

 

There's open source photogrammetry software so that would work...

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10 minutes ago, DasFrodo said:

his COULD be done with photogrammetry!

 

I hope you're right, but recent experience suggests otherwise I fear  🙂 I suspect photogrammetry will fail if it's just a brown plain paper bag - not enough surface details for it to accurately recreate the form - we tried doing something similar on some matte black golf clubs the other day, and I can't tell you how hard that failed !!! But if you covered the brown paper in lots of little white dots maybe, or if there were tons of creases so it had enough details and areas not lost to single homogenous colour to plot the shape ?!!

 

CBR

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It does require careful lighting and quality photography to be sure - but I had a acquaintance who had great success with photogrammetry on a white iced Christmas cake! So it can be done!  Now it was one of those cakes with lots of random peaks in the icing - so that did help!

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  • Customer

Just throwing an idea, can't test it.

What if

  • you had a duplicate bottle model
  • made it pow poly using the polygon reduction generator (to create a paper-like topology)
  • scaled it a bit bigger than the original model
  • placed it to enclose the original model
  • use a soft-body on the new one
  • set a negative inflation
  • let it shrink on top of the original (might need some normal inversion)
  • once shrunk make editable and delete the top to make a hole
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