Author Topic: Civil 3d is not HotWheels Approved  (Read 5801 times)

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quaziconscience

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Civil 3d is not HotWheels Approved
« on: July 31, 2015, 04:36:27 AM »
To my hearts discontent, I am unable to resurrect nostalgia, and build that loop-d-loop I dreamed so much about.  I pontificate, is Civil 3d really 3d, or just an illusion of 3d. Should we have all taken the other pill?

Diněsaur

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Re: Civil 3d is not HotWheels Approved
« Reply #1 on: July 31, 2015, 07:33:18 AM »
Civil 3D is often not even Civil, much less true 3D
Stephen R. Sherrill,
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mjfarrell

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Re: Civil 3d is not HotWheels Approved
« Reply #2 on: July 31, 2015, 01:20:43 PM »
it appears possible -tedious to setup - but likely possible to trick C3D into it
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BlackBox

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Re: Civil 3d is not HotWheels Approved
« Reply #3 on: July 31, 2015, 01:45:12 PM »
Civil 3D is often not even Civil, much less true 3D

This.
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cadtag

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Re: Civil 3d is not HotWheels Approved
« Reply #4 on: July 31, 2015, 01:56:25 PM »
but.... Dirt 2.25D just didn't have the marketing cachet to be a product name  :whistling:
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BlackBox

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Re: Civil 3d is not HotWheels Approved
« Reply #5 on: July 31, 2015, 02:05:20 PM »
Haha

The concept of having a 2D Alignment and 2D Profile designed within the confines of a 2D Profile View, which combined, represent a 3D Vertical Alignment, leaves a lot to be desired.

Especially, as compared to that of a single 3D entity (NURBS? I 'spose Feature Line will do) which can provide both horizontal, vertical, and station information and be 'extruded' upon by a given typical section to produce a corridor.
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cadtag

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Re: Civil 3d is not HotWheels Approved
« Reply #6 on: July 31, 2015, 02:14:09 PM »
as long as civil surfaces are defined under the constraints of a TIN model, 2D+(some Z's only) is about it.

" a set of contiguous, non-overlapping triangles" doesn't allow for overhangs or verticals
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mjfarrell

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Re: Civil 3d is not HotWheels Approved
« Reply #7 on: July 31, 2015, 02:16:15 PM »
Haha

The concept of having a 2D Alignment and 2D Profile designed within the confines of a 2D Profile View, which combined, represent a 3D Vertical Alignment, leaves a lot to be desired.

Especially, as compared to that of a single 3D entity (NURBS? I 'spose Feature Line will do) which can provide both horizontal, vertical, and station information and be 'extruded' upon by a given typical section to produce a corridor.

It can be done using standard autocad 3d primitives...the disillusionment is when the stock c3D tools fail miserably.
However after seeing why and deconstructing how it failed, the trick was derived from the failure. 
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mjfarrell

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Re: Civil 3d is not HotWheels Approved
« Reply #8 on: July 31, 2015, 02:17:22 PM »
as long as civil surfaces are defined under the constraints of a TIN model, 2D+(some Z's only) is about it.

" a set of contiguous, non-overlapping triangles" doesn't allow for overhangs or verticals

Oh yes it does,...I can show you both tunnel and overpass models made from those pesky limiting triangles.
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cadtag

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Re: Civil 3d is not HotWheels Approved
« Reply #9 on: July 31, 2015, 03:01:49 PM »
cool, post an example.  My (limited) understanding of the triangulation model used tells me that a single TIN surface can't overlap or overhang.  Would love to find out i'm wrong.
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mjfarrell

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Re: Civil 3d is not HotWheels Approved
« Reply #10 on: August 05, 2015, 05:40:09 PM »
cool, post an example.  My (limited) understanding of the triangulation model used tells me that a single TIN surface can't overlap or overhang.  Would love to find out i'm wrong.
see here   http://www.theswamp.org/index.php?topic=49902.msg550863#msg550863
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cadtag

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Re: Civil 3d is not HotWheels Approved
« Reply #11 on: August 12, 2015, 11:16:13 AM »
I'm not seeing any overlap or overhang in that drawing..... 
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mjfarrell

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Re: Civil 3d is not HotWheels Approved
« Reply #12 on: August 12, 2015, 11:46:02 AM »
It would be more apparent in a tunnel instance.
However part of the 'trick' is to not create surfaces that overlap....
even with the loop the loop there is a trick to create surfaces with no overhangs or overlaps
and to compensate for alignments not wanting to double back on themselves stationing-wise

Oh and creating the points along a 10X vertical scaled circular profile...
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dgorsman

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Re: Civil 3d is not HotWheels Approved
« Reply #13 on: August 13, 2015, 11:52:08 AM »
Not looking for anything specific to Civil3D, but the concept of TIN or similar procedural triangulation in general being applied.
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mjfarrell

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Re: Civil 3d is not HotWheels Approved
« Reply #14 on: August 13, 2015, 12:38:16 PM »
Not looking for anything specific to Civil3D, but the concept of TIN or similar procedural triangulation in general being applied.

What is it you are interested in knowing?
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