Akshay

CATIA ICEM surf and solidThinking Evolve, are they same ?

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Hello guys, I need your help in this context. CATIA "imagine and shape" and solidThinking Evolve are these same? Are both used for class A surfacing? What are relative advantages and limitations of these two softwares?

Thank you in advance 

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What is class A surfacing? Are there any other  classes of surfacing? (Like class B or class C). As solidThinking Evolve uses PolyNURBS tool, what kind of surfacing we can do in evolve?

Please help.

Thanks

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Well SolidWorks would not agree with you :) If you are coming from SolidWorks background and you just want more control over your surfaces 3DS suggests you use SolidThinking Evolve and it classifies it as class A surface modeler. Check it out yourself LINK

I'm pretty sure you can pull off a class A surface in Evolve with nurbs cause nurbs foundation is as same as it is in Alias. Once you venture into multisweeps and multiple rails then it's questionable how much of a control you have to pull of a ultra high quality surface. Maybe some of the sTE people can reply on that one. 

It also depends from which spectrum you are coming from, if you are a product designer then go ahead and use Evolve cause it's ten times more natural and faster than Alias or any other established surface A tool. Advantage of Evolve or Rhino is that you can jump into the fire right away and walkaway with the finished product quite fast. Good luck doing that in certified class A surface tool such as NX or CATIA, I for once can't even choose the right version of CATIA cause there are so many modules, versions and what not. If you are a designer you also have the benefit of sending your model to engineers who already work in Alias or similar and they will rebuild the surface anyway if it needs rebuilding.

And then there is big BUT. Class A surfaces are all nice and dandy but outside of transport industry very few consumer products do include ultra high quality surfaces. Take your average Dell/HP/Lenovo laptops and look at those side edges, it's obvious with the naked eye that there are some distortions in transition. That could be a mistake in modeling or in production due to cost cutting.

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Class A surfacing is a methodology and modeling technique. Evolve contains some concepts of class A modeling like curvature continuity but is not the ideal tool for creating flawless surfaces, like those you see on automobiles. The inherent quality of class A surface is its ideal CV distribution. Certain tools in Evolve are based on parasolid(same engine as solidWorks) and deliver undesired CV distribution that can later be partially redistributed. Evolve has construction history, that makes it hard to redistribute points while maintaining dependencies. Most programs like Alias, leader in Class A surfacing, requires you to delete the history before manual manipulation of CVs. However, the nomenclature is slightly flawed. Everyone knows that to achieve a class A surface, the underlying curve must be of the highest quality. Therefore, your curves must contain the least number of CV's and show smooth curvature. See image attached.

 

If you use the top curve to create surfaces, the output will be low quality. The bottom curve has a very close shape but with better CV distribution. Hence, while creating curves, use the curve plot tool - shortcut -SHFT+CTRL(CMD)+P and check the quality of the curve. 

For product design, class A surfacing is not a mandate, unless you are talking about Apple, that is very particular on surface quality. You can achieve good surface quality in Evolve at the expense of time. 

Screen Shot 2017-12-13 at 7.44.15 AM.png

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Thanks for the clarification.

I know this is not the best place on forum to ask this but do you plan to give option to add more than two CVs per one MetaCURVE segment? Or MetaCRUVE is just a NURBS curve with different control?

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