SubD smoothed edge: infinitely sharp vs crease value =1

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SubD smoothed edge: infinitely sharp vs crease value =1

Postby uwesketch » Tue Feb 05, 2019 8:10 am

An edge marked as "infinitely sharp" will be subdivided as a non-smooth edge.
When removing the "infinitely sharp" flag, the crease value changes to be 1. It would be nice, if the edge would be marked as smooth when subdividing with a value of 1. Otherwise I have to set the crease value to 0.99 to get a sharp smoothed edge.
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Re: SubD smoothed edge: infinitely sharp vs crease value =1

Postby thomthom » Tue Feb 05, 2019 5:59 pm

uwesketch wrote:An edge marked as "infinitely sharp" will be subdivided as a non-smooth edge.
When removing the "infinitely sharp" flag, the crease value changes to be 1. It would be nice, if the edge would be marked as smooth when subdividing with a value of 1. Otherwise I have to set the crease value to 0.99 to get a sharp smoothed edge.

I'm not sure I quite follow.

Can you post some screenshot and a sample model to illustrate?
Also, are you using Relative Sharpness?
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Re: SubD smoothed edge: infinitely sharp vs crease value =1

Postby uwesketch » Wed Feb 06, 2019 11:29 pm

Hi Thom

I hope below screenshots clarify.

Why is the smoothing of a creased edge depending on the number of iterations when the value is a relative value?
For me it would be easier, if a relative value of 1 would as well create a smooth edge. Like this one can easily distinguish between infnite and a relative value of 1.

original mesh with edge set to smooth:
crease and smooth orig.png



infinite crease value:

crease infinit any iter not smooth.png



absolute crease values:

crease abs 1 any iter not smooth.png

crease abs 0.99 any iter smooth.png



corresponding relative values:

crease rel 0.99 1iter not smooth.png

crease rel 0.50 2iter not smooth.png

crease rel 0.33 3iter not smooth.png

crease rel 0.25 4iter not smooth.png
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Re: SubD smoothed edge: infinitely sharp vs crease value =1

Postby thomthom » Thu Feb 07, 2019 10:52 am

Oh, I see, infinitely sharp edges override the original smooth-property of the edge. Yea - that's a bug. Thanks for reporting! I've logged it to my issue tracker and will be looking into why this happens.

Sorry for the inconvenience.
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