Lengthening a series of lines in equal increments

pbacot

no no no mon amis.

You make the first line the correct starting height. you make a copy at the correct interval and add the 30 mm. You draw a line (just like getting a stair angle) from top of first to second. You array remaining lines very long at the same interval. You draw a line from the angled line using the pink inference. select the top lines and erase.

You only have to know the givens: first line height, increment of increase, intervals.

(like you said the second time)

davecon

aaargh I feel like such a newbie!

I can manage to do what Tig and Pbacot have suggested and that seems to work ok on a straight line (but not on a curve or spiral), but I cannot seem to make Jeff's suggestion work. I have got the fredoscale plugin but cannot get it to do what I need.

So I set my line like this
line before taper.jpg

Then using the tapering tool (tried both by box and target) select the line on the right and click on the bottom right and then to the top left and click
during taper.jpg

and all I get is this
after taper.jpg

I am obviously doing something wrong but I have no idea where I am making a mistake.

Jean Lemire

I folks.

If you know the increment in height, the distance between lines and the number of required lines, there are no calculations involved and no plugins required.

Click in sequence on the scenes tabs of this SU file for ideas.

Array of lines of uniformly changing length.skp

davecon

Thanks for the help so far everyone

I have got the hang of doing this on a straight line, now the complex bit is trying to do it on a spiral. Currently I am trying to turn the model on the left (spiral with even length lines) in the model on the right (spiral with lines increasing by XX per length)
spiral lines.jpg

Ideally what I would like to be able to do is select the first line (red) and then the last line (green) and be able to input something like "starting the with the first line make all the others increase in XXmm increments"

Here is the file itself so far.
spiral lines.skp

gilles

My two cents, no plugin.

V6 for Pilou's Minitel

pilou

@unknownuser said:

V6 for Pilou's Minitel

-Thx for my Minitel: every people should make the same!

TIG

This is how I'd do it...
There are scripts [by me?] that that will add simple cylinder components, scaling lengths to match selected lines length in Z... Search the Plugins Index...

spiral lines.PNG

spiral lines.skp

pbacot

Davecon,

I notice that you are also working on a straight line, so why not use the simple way? You can also curve your array of lines after making the varied line lengths.

In using the box tapering tool are you grouping the lines first? It doesn't look like it. You would get a rectangle designated by the tool. It appears you are only working on one line. Most, if not all, of the FredOscale tools operate on groups and components. That is a clean way to do it once you know the end length or you set guideline based on the increment. I can't imagine how it would work on a curve either.

Peter
Screen shot 2012-05-30 at 7.28.05 AM.png
Screen shot 2012-05-30 at 7.32.03 AM.png
Screen shot 2012-05-30 at 7.29.43 AM.png

gilles

Or, make it flat then use Shapebender.

jeff hammond

a rough go at doing this with a dynamic component…

select the line at the origin then Window -> Component Options…. change the "# of vertical lines per turn" option for immediate results..

i plotted the lines using this..
x = a(t) cos(t), y = a(t) sin(t)

which looks like this: (archimedean spiral)

jeff hammond

•

another method…

click pic -> bigger

curvishear is part of FredoTools..
http://forums.sketchucation.com/viewtopic.php?t=42089

curviLoft is here:
http://forums.sketchucation.com/viewtopic.php?t=28586

pilou

@Jeff
Shadowline on the ground of the Curvishear is very elegant! (middle drawing image)

Not possible to make a curve with it ? (maybe a script is yet existing ? )

jeff hammond

@unknownuser said:

@Jeff
Shadowline on the ground of the Curvyshear is very elegant! (middle drawing image)

Not possible to make a curve with it ?

hmm.. not that i know of.. would be neat if you could though..

(actually, you could probably project the geometry somehow?? i think there might even be a plugin that could do it?)

jeff hammond

[off:aznqnqp7]
@unknownuser said:

@unknownuser said:

@Jeff
Shadowline on the ground of the Curvyshear is very elegant! (middle drawing image)

Not possible to make a curve with it ?

hmm.. not that i know of.. would be neat if you could though..

(actually, you could probably project the geometry somehow?? i think there might even be a plugin that could do it?)

set sun directly overhead to be used as a preview..
orient the helix to your liking using the shadow as a guide..
sandbox-> drape…

[/off:aznqnqp7]

pilou

So that was simple!
I will try that because seems too simple for to be true!

About the first problem
I am waiting the Sdmitch autorization
for calculate a serie of lines not in equal increment

pilou

@Jeff
I'm very bored for testing your genious trick!

Very Curious I can't have the open of the all menu of a Shadow settings box dialog!
I don't have the same Shadow settings
From your Shadows settings image

And this don't open something more! (V6 or V7)
Shadow tool is enable on the Toolsbar list menu!

Seems i had this box dialog in the past

No more in Style / Edges

The button Activate Shadow dialog seems makes nothing!
No more in selecting curve right click
No more Entity Info, Model info... Cast Shadows, Receive Shadows are enable

Maybe I miss something or a plug squize this function ?

pilou

So for the lines in not equal alignement

make each lines as component (see follow how do make that)
(there are the Target)

redraw the same number of lines in equal alignement
use any method above for modify them
make each these new lines as a components (there are the Source)
(see follow how do make that)

use this tricky new plugin of Sdmitch who permit now replace components Source--> Target
Randomly or Not ! So choose No

See this post for precision of the normal use of the Replace Components

And maybe a plug(s) for make each (original lines / new lines) a component
Select a familly of lines
Loose geometry to groups by Chris Fullmer
Then Groups to components TT by Thomthom

That all!

ComponentReplacement.rb

jeff hammond

hmm.. i don't know what to tell you.. it's not a plugin.. just standard sketchup settings.

does someone with windows know about this?

once you get that part figure out, you'll also want to go Model Info -> Geo Location -> Set Manual Location
then set the latitude to 0º
this will make it possible to have the sun directly over head.. then adjust the time of day settings to fine tune it..
(use Top View when lining it up)