The shape in AutoCAD doesnt change but there is nog perspective... Just type Perspective and press enter than press 1 and you have your perspective cube.

with a big respect to you cad most of programs do change the dimensions while you do rotating , i tried auto cad , maya, google SU and they all do change dimension while you do rotate the shape believe me, you just need to compare by eye of made model and that you see on your screen so you can see the big different.

one more thing the only program I found that give a real dimensions is Mathematica wolfram  but the problem the rotating options are so poor.

I tried to lock the shape on autocad but it didnt work.



Edited by Hana.A - 26.Nov.2010 at 17:57

The dimension change
maybe i have no so much experience with auto cad but what more than a Engineer friend of mine who I discussed with him the matter and he said its first time to notice this and he was surprised , i think there an option in autocad on the lower bar to lock the dimension of the shape and he did click but still with rotation the dimensions lengths get so different than reality.

what I can do for you to proof this is to take photo of my camera to show you the clear different

but let me ask you question first... if you have for example pyramid shape and you eye mapping 3 edges on the same dimension pyramid on your screen, the other 2 edges of the pyramids on your hand 100% of the model on your hand will lay on the shape on your monitor on any position this how its.
im going to prove it for you soon
 

Hana.A wrote: The dimension change maybe i have no so much experience with auto cad but what more than a Engineer friend of mine who I discussed with him the matter and he said its first time to notice this and he was surprised , i think there an option in autocad on the lower bar to lock the dimension of the shape and he did click but still with rotation the dimensions lengths get so different than reality. what I can do for you to proof this is to take photo of my camera to show you the clear different but let me ask you question first... if you have for example pyramid shape and you eye mapping 3 edges on the same dimension pyramid on your screen, the other 2 edges of the pyramids on your hand 100% of the model on your hand will lay on the shape on your monitor on any position this how its. im going to prove it for you soon

Please provide me with numbers. You keep saying that the dimensions change but you have yet to give me any proof of this. What are the dimensions of the object before rotation and what are the dimensions after rotation? I just tried it on my machine, and no matter how much I rotate the model, the dimensions never change. They stay constant. I have been using CAD and 3D programs for well over 20 years and I have never experienced anything like what you're describing.

You also keep saying "eye mapping". What in the world is "eye mapping"? Are you holding a model in front of your monitor and trying to match it up with the screen display? If so, why?

The only thing I can think is that you don't have Perspective turned on. But even then, the dimensions will not change after rotation. This is what I don't understand, so please provide numbers. What are the dimensions of the model before and after rotation.

So you don't even have Autocad? Why are we having this discussion then?

I think you are confusing your terminology though. You are stating that the dimensions of the model are changing, but I don't think that's what you really mean. I think it's just a case of the perspective view on screen not matching the object you're holding in front of the monitor. If you turn on Perspective, in Autocad, I think the screen display will more closely match the object you're holding. But you should not expect it to be a perfect match. Remember that you are holding a real 3 dimensional object in your hand and trying to match it up against a 3D representation on your flat screen. It may not be a 100% perfect match.