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M.D. Kennedy  
#1 Posted : Friday, June 24, 2016 8:45:16 AM(UTC)
M.D. Kennedy

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I'm trying to design a turnout for my large scale outside railroad.
6 simple steps will highlight the problem.

Start with ViaCAD 9.0.9 build 1184, in 2D mode, Preferences Units in Inches, Resolution in Fine or Super Fine (makes no difference)

1) Select Single Line tool from Origin draw 1000" up the Y axis (positive direction).

2) Select Midpint Line tool and select Origin, draw line 1000" long at 180 degrees (along the X axis) and perpendicular to the first line drawn.

3) Select Parallel Line tool and duplicate the line drawn in step 2 offset up the Y axis 480 inches.

4) Create another duplicate line from the one drawn in step 2 and offset it 960 inches up the Y axis.

5) Select Circle 1 Point tool and set diameter to 960 inches and draw a circle centered on the Origin.

6) Create a second circle centered at the intersection of the Y axis line and the 960" offset parallel line.

Zooming into where the two circles should meet tangentially, the parallel line offset at 480 inches and the Y axis line all come together, you would expect to see them all meet at a single point. THEY DON'T AND THAT'S A PROBLEM! This is my first post, I've been using ViaCAD for several years but only for small things, this is the first thing really big I've tried to draw. I'll try to include an example file.

Am I doing something wrong here or is this a bug in the program?

Thank you in advance for any help or advice!

Michael Kennedy
File Attachment(s):
Y switch design.vc3 (9kb) downloaded 10 time(s).

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GARLIC  
#2 Posted : Friday, June 24, 2016 10:10:50 AM(UTC)
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Michael:

1. Make everything active
2. Go to edit and change the resolution to : superfine + even distribution
3. watch the result.....

just my 2 cts
G.
thanks 2 users thanked GARLIC for this useful post.
L. Banasky on 6/24/2016(UTC), M.D. Kennedy on 6/24/2016(UTC)
L. Banasky  
#3 Posted : Friday, June 24, 2016 12:33:22 PM(UTC)
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Hi Garlic,
That made a huge improvement,
Thanks for the tip.
Larry
M.D. Kennedy  
#4 Posted : Friday, June 24, 2016 6:21:37 PM(UTC)
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Selecting all the objects and changing their Resolution attributes to "Super Fine" appears to get everything lining up as expected. Thank you very much.

Follow up questions, if you please:

1) What do you mean by "Make everything active"?

2) What is "even distribution" and where do I change/set that?

Thank you again!
Michael
BillB  
#5 Posted : Saturday, June 25, 2016 2:36:32 AM(UTC)
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If you are going to be designing a lot of turnouts you could try Templot, Which was written to do just that. It does, though, have a fairly steep learning curve.
Bill Bedford

Viacad Pro 11 (11417)

OS X 10.13.6
GARLIC  
#6 Posted : Saturday, June 25, 2016 4:40:15 AM(UTC)
GARLIC

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Originally Posted by: M.D. Kennedy Go to Quoted Post
Selecting all the objects and changing their Resolution attributes to "Super Fine" appears to get everything lining up as expected. Thank you very much.

Follow up questions, if you please:

1) What do you mean by "Make everything active"?

2) What is "even distribution" and where do I change/set that?

Thank you again!
Michael


Here you go:
ad 1: Ctrl + A Select all
ad 2: Menu Bar: Edit / Change Resolution/choose 'Super Fine + Even Distribution'

best wishes
G.

Tim Olson  
#7 Posted : Saturday, June 25, 2016 12:31:09 PM(UTC)
Tim Olson

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>> you would expect to see them all meet at a single point. THEY DON'T AND THAT'S A PROBLEM!

Hi Michael

ViaCAD uses OpenGL to draw geometry to the screen. OpenGL takes facets and line segments to convert into pixels. So that means geometry such as a circle needs to be converted from their underlying exact equations into something simple. In this case the equation of a circle is vectorized. The amount of vectorization (number of line segments approximating the circle) is controlled by the user through the Edit : Resolution command.

As Garlic mentioned, you can get the most vectorization by using SuperFine & Precision.

You can also create your own definition of SuperFine using Prefs: Custom Resolution. The default angular tolerance for super fine is 4.5 degrees.

When the geometry is actually used, ACIS uses the exact equations, not the display resolution.

Tim

Edited by user Saturday, June 25, 2016 12:33:04 PM(UTC)  | Reason: Not specified

Tim Olson
IMSI Design/Encore
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