CAD Forum discussion (EN) : Autocad 3D arc

Autocad 3D arc : Well it seems we both learned...

Fri, 20 May 2011 12:41:39 +0000

Author: John Connor
Subject: 5913
Posted: 20.May.2011 at 12:41

Well it seems we both learned something. I'd call that a win-win. You're welcomed Kajito.

Autocad 3D arc : John, yeah the spline actually...

Fri, 20 May 2011 10:56:26 +0000

Author: Kajito
Subject: 5913
Posted: 20.May.2011 at 10:56

John,

yeah the spline actually works fine, dont know why I thought spline cannot have a infinite curvature ... my brain doesnt seem to work these days ;))

thanks for help

c u at next topic ;)

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Autocad 3D arc : You must be using a different...

Wed, 18 May 2011 23:36:10 +0000

Author: John Connor
Subject: 5913
Posted: 18.May.2011 at 23:36

You must be using a different "spline" than I am because as you see from my last image I have a straight section followed by a curve followed by another straight section.

I think if you use a helix you would have a lot of slicing to do. I threw that out there before I had a chance to test the spline option.

Autocad 3D arc : thanks for suggestion John. my...

Wed, 18 May 2011 23:17:18 +0000

Author: Kajito
Subject: 5913
Posted: 18.May.2011 at 23:17

thanks for suggestion John. my issues is not with the loft or anything such as, but with the guides/paths. Spline works fine but it is not the exact geometry (althought it is only for presentation I'd like to know how to make it right). it will not create straight line, arc as tangent and straight line again. (or am I missing smth).

I tired the helix but i honestly cannot get my head around, it is the first time I used it to be honest.

Autocad 3D arc : Curved 3D ramp. Edited...

Wed, 18 May 2011 20:01:56 +0000

Author: John Connor
Subject: 5913
Posted: 18.May.2011 at 20:01

Curved 3D ramp.

Edited by John Connor - 18.May.2011 at 20:03

Autocad 3D arc : It can be done using the LOFT...

Wed, 18 May 2011 19:53:47 +0000

Author: John Connor
Subject: 5913
Posted: 18.May.2011 at 19:53

It can be done using the LOFT command but first you'll have to create your "Guides" with a Spline. I tested it and it does work. Some attention to detail is required when placing the pick points for your splines (you'll need two, one for each side of the ramp).

Autocad 3D arc : Maybe you can use a helix and...

Wed, 18 May 2011 19:06:36 +0000

Author: John Connor
Subject: 5913
Posted: 18.May.2011 at 19:06

Maybe you can use a helix and slice off what you don't need. Or maybe use a spline?

Autocad 3D arc : John, I have it all: 3.5m difference...

Wed, 18 May 2011 17:33:49 +0000

Author: Kajito
Subject: 5913
Posted: 18.May.2011 at 17:33

John,

I have it all: 3.5m difference between floors (sfl), ramp profile (rectangular slab with kerbs), both plans. It is just a classic ramp within a building for an underground car park. (The building itself is finished but I'm doing some 3D models for presentation purposes). It should be easy, but somehow it is not. I can do it without issus in one plane or on straight line, but when it comes to the curved 3D Part it doesn't work. I have a feeling I'm doing some basic stupid mistake.

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Autocad 3D arc : What information do you actually...

Wed, 18 May 2011 17:04:43 +0000

Author: John Connor
Subject: 5913
Posted: 18.May.2011 at 17:04

What information do you actually have? Do you have...

1. The height difference between the basement and ground floor?
2. A layout for both floors for siting purposes?
3. A predetermined width for the ramp?
4. A site plan?

This is an exterior ramp? Yes/No?

Autocad 3D arc : 'm sorry guys, I forgot to...

Wed, 18 May 2011 16:31:43 +0000

Author: Kajito
Subject: 5913
Posted: 18.May.2011 at 16:31

'm sorry guys, I forgot to mention that the ramp is an access ramp between basement and ground floor. That's why the loft command is not really working because I dont have the path. One interesting thing is that when I draw an arc and then rotate it in 3D, I cannot trace a 3D polyline on the arc. I'm really confused about this one.

How do you actually draw 3D curve?

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