Topic: Challenge the membership

[Mark]

Describe an object that would challenge the abilities of members here if they had to create it in 3D.

[Cathy]

A spring.

[Greg B]

A flaccid...







balloon.

[uncoolperson]

this

[Josh Nieman]

this

That's been solved for a long time.  You create it by having the legs curve away from the camera along an axis that runs parallel with the camera's angle.  Thus the back leg will curve towards the camera from top to bottom, in front of the front leg which curves backward.  These curves, since they curve along an axis that shows no deviation in the camera's eye, will reveal a seemingly-straight leg.

[Josh Nieman]

Describe an object that would challenge the abilities of members here if they had to create it in 3D.

I don't think MODELING is the problem anymore.  Which such sophisticated modeling programs using NURBs, and even current solid editing technology with improved boolean operations... I really don't think there's anything I can't model.

Photorealistic rendering is what is the big thing nowadays, I think... it used to be "who can make the best fire" and now someone made plugins for software that makes it easy... it used to be "who can get gemstones to appear realistic" and now there's plugins for that...

I'm not sure what the current hard-object-to-make is... I'm not too up on the current events of the rendering community anymore.  Too busy modeling.

I don't think there's anything that's hard to model... just... time consuming.  I would like to be proven wrong though, and give something that proves me wrong, a shot!

[SDETERS]

Here is a good one for you.

You have a shaft that shaft is turning  and you are taking a cutting tool and cutting into that shaft perpenducalar to its center as the cutting tool is revolving and moving down a distance around the center of the shaft.  At the end of the cut you have true full fillets that represent the cutting tool.  Also known as a 5 axes milling job.

I would like to see if any body has modeled something like that.  I know how to do it.  Hint it is not a simple revolve with translation!!!!

I would like to see and IGES and or Step file if you think you have it figured out. 

[Cavediver]

Here is a good one for you.

You have a shaft that shaft is turning  and you are taking a cutting tool and cutting into that shaft perpenducalar to its center as the cutting tool is revolving and moving down a distance around the center of the shaft.  At the end of the cut you have true full fillets that represent the cutting tool.  Also known as a 5 axes milling job.

I would like to see if any body has modeled something like that.  I know how to do it.  Hint it is not a simple revolve with translation!!!!

I would like to see and IGES and or Step file if you think you have it figured out. 

Not quite following you.  How about a little demo?

[cad-waulader]

cutting tool is cutting into the shaft by pressing into the shaft, perpendicular to center axis of shaft...
then I lose the visual.  can you say again?

[Maverick®]

Think a vertical cheese log being cut by a wire that moves down as the log spins.  Right?

I'm from Wisconsin. Everything is about cheese.   

[Maverick®]

Amend that to the wire revolving and dropping.  The log stays put.

Same diff though.  I think. 

[cad-waulader]

Cheddar, or Jack?  Aged, or not? Nut-coating, or wax?  Organic, or GMO?  Calif, or Wisconsin?  Need to define more parameters to tackle this one.   

[Cavediver]

Also, ball end cutter, or a flat endmill?
Is this along the right lines?

[SDETERS]

Before I say correct please post step or iges file.  It looks ok!  I will post the result Monday! Is that fillet at the bottom tangent to the surface?  Is that fillet centerline going through the center of the pin?


YOu got the idea

If you did it in a tool path type cutter in a cam package that is not fair!  I know you use Solidworks so did you cheat and use the cam package or did you model it from scratch?

I will have a model MOnday I will post.  It is really cool.  Think of modeling a Fillament in a LIght Bulb!

[uncoolperson]

Think of modeling a Fillament in a LIght Bulb!

Florescent?

[SDETERS]

No  I am thinking of one that is in your headlights in your car!

[uncoolperson]

dangit, cause i'm pretty good with the other

[Bob]

I was bored when my wife worked on nights the other night.

I was looking at a glass / metal lightshade in the study above my computer.

I decided to model it. Looking closely at it, it is a dodecahedron with a point sticking out from the middle of each face.

(a dodecahedron is a 12 faced shape with each face having 5 sides)

No cheating (you can look up the angles with google) this needs to be constructed.

Its really strange some things that you do when your wife's on nights.....

[Cavediver]

Before I say correct please post step or iges file.  It looks ok!  I will post the result Monday! Is that fillet at the bottom tangent to the surface?  Is that fillet centerline going through the center of the pin?


YOu got the idea

If you did it in a tool path type cutter in a cam package that is not fair!  I know you use Solidworks so did you cheat and use the cam package or did you model it from scratch?

I will have a model MOnday I will post.  It is really cool.  Think of modeling a Fillament in a LIght Bulb!

I doubt it's correct.  already changed the model though, and it's at the office.  I'll post it up on Monday though.

[SDETERS]

Here is a model of the shaft or the cheese and log problem if you will.

this should open up in Autocad Please tell me if does not and I will try an earlier sat version.

Please look at this part it represents the cutter profile and not the shaft being cut I will up load shaft when I get a chance  Fixed

thanks

oK Finally got time during lunch to post a better model.  I hope this helps

Added shaft sat file

[Cavediver]

I was looking at a glass / metal lightshade in the study above my computer.

Lol, I was working on something similar not too long ago.  My wife and I have a little candle holder in our den.  I needed some backdrop items for a rendering, and thought that would be neat.  Here it is, bronze and glass.  I never could get the internal lighting to work though.

[Josh Nieman]

(a dodecahedron is a 12 faced shape with each face having 5 sides)

No cheating (you can look up the angles with google) this needs to be constructed.

That's what I mean about software being too easy to make models these days.  Using a program like Inventor that's parametric, one would only have to draw the pentagon, extrude it at a draft angle of 5-20 degrees or so to make it look right to get the point, then, in an assembly insert that object 20 times, attach them by edge until you have completed the dodecahedron, make all angles equal, and bam... there it is.

In Autocad there'd be a few more steps... but not really... not with the align command and such.

[SDETERS]

Cool looking part I wish I knew the in and outs of rendering with materials and such

Anyways I will find the filament model and convert that and see of you anybody can figure that one out

[Bob]

That's exactly it, Cavediver.

Sorry that it was too easy for you.

My wife is on nights again. Now lets see what else to draw........

[quicksilver]

This has been going on in the inventor community for a while.
http://worldcup.teknigroup.com/worldcupfiles.asp
The January one looks interesting.

[Josh Nieman]

This has been going on in the inventor community for a while.
http://worldcup.teknigroup.com/worldcupfiles.asp
The January one looks interesting.

That's one of the first things I thought of when Mark started this... it's really successful over there... but from what I see it's more of a competition to see who can do it faster which... sucks.

Sorry, but the only place I have Inventor AND Autocad is at work and I'm not going to "compete" when I get phone calls, meetings, interruptions way to often... I have Autocad at home, but then again I have diaper changes for Maverick (my son, not Maverick®) feedings, unexpected episodes of Scrubs, and beer-thirty, beer-fifteen, beer-o-clock, beer-forty-five...

[SDETERS]

I think it is also just for people running inventor.  What if you want to run something like Solidworks or Solidedge or Catia?  They probably will not let you play.

[Josh Nieman]

I think it is also just for people running inventor.  What if you want to run something like Solidworks or Solidedge or Catia?  They probably will not let you play.

True, it's put on on the Autodesk Discussion Boards.  It's software-community specific.  Maybe in the discussion boards or community pages of those software packages you could find something?  I would be surprised if Solidworks specifically did NOT have something like this going on... they seemed to have a pretty good community going.

[Cavediver]

That's exactly it, Cavediver.

Sorry that it was too easy for you.

My wife is on nights again. Now lets see what else to draw........

Lol, don't get that idea.  It's something I'd already put thought into before you posted the idea.  Besides, SolidWorks is what made it easy.  It's one of the benefits of the modeling process in that program.

[Cavediver]

I think it is also just for people running inventor.  What if you want to run something like Solidworks or Solidedge or Catia?  They probably will not let you play.

True, it's put on on the Autodesk Discussion Boards.  It's software-community specific.  Maybe in the discussion boards or community pages of those software packages you could find something?  I would be surprised if Solidworks specifically did NOT have something like this going on... they seemed to have a pretty good community going.

I've played in a SW rendering challenge, but my lack of OS upgrade has prevented me from working with 2007.  Supposedly the Photoworks package has been seriously improved.

BTW SDETRERS, the simple renderings (all I can do) are easy.  Slap some materials on it and use stock lighting setups.  Getting something realistic is a lot more challenging.  That's why I download the SW challenge every month.  I've yet to send in one of my efforts, it's really more for educating myself.
http://www.robrodriguez.com

[quicksilver]

I wasn't suggesting that you join the contest.  Any 3d package should be able to make the files.  I make them just to challenge myself without the timer.

[Josh Nieman]

Create a single sided object... that object that your geometry teacher shows you just to mess with your head.  You take a strip of paper 1" wide X 12" in length, approx.  Hold the ends, then twist one end 180%%d and tape it to the other end, making a loop... then if you draw a line on one side continuously through the loop... you'll draw on both sides, and end up where you started... giving reason to the argument that the shape indeed only has one side, and thickness... which should be impossible.

Anyways... Autocad and importing it into 3dsmax both couldn't handle the shape for me... if someone can do it without it getting all artifacty or jittered... i'd love to know how.

here's the best screen cap I can do.



I think they don't totally understand it, because there is no normal face... because it switches or whatever... anyways, it's one solid object 1/16" thick, with one side.. so to speak.

It may be easy to model for some... but there's a bit of tricks to it.

[SDETERS]

Does it have to have a thickness?

Please check out the model

[Josh Nieman]

Does it have to have a thickness?

Not really... doesn't matter i guess.

Please check out the model

Yea, I shoulda thought to do a mesh.  I'm too used to solids though.  I model with solids pretty much exclusively.  Your model looks better than mine, in a shaded view, but still gets choppy and has problems similar to mine... could be video card related.. who knows...

yep, you got 'er though...

Yea... I just don't know anything that would be hard to model...

[Josh Nieman]

Maybe a fun thing to do...

Model your favorite fast food restaurant!  It's something we'd all know and recognize (for the most part) so it wouldn't be subjective at all, since we'd all know whether the Golden Arches have 2 or 3 humps