mini-challenge

[Jeff Hammond]

I took one more stab at it...........hopefully more worthy than my first attempt.

Please see attached SKP's

Charlie

hey Charlie.. that's gilles' second (i think second) solution.. it does get it very very close and to me, it's acceptably close since i'll be working in inches like you.. if you tried that while working in metric with the highest precision setting allowed in sketchup then the error would show up..

basically, you rotate the end to 90º which is fine and what needs to happen.. however, when you rotate the other end to 90º it throws off the first end's 90º..

[CHARLIE__V]

I took one more stab at it...........hopefully more worthy than my first attempt.

Please see attached SKP's

Charlie

hey Charlie.. that's gilles' second (i think second) solution.. it does get it very very close and to me, it's acceptably close since i'll be working in inches like you.. if you tried that while working in metric with the highest precision setting allowed in sketchup then the error would show up..

basically, you rotate the end to 90º which is fine and what needs to happen.. however, when you rotate the other end to 90º it throws off the first end's 90º..

Apologies to Gilles ..............somehow I missed that.......I now see it on pg 7....

And thanks Jeff for pointing that out.

Charlie

[gilles]

Be my guest.

[CHARLIE__V]

Oh, and Jeff...........thanks for binging this to light.

A few months ago I was working on a Zipline project.......and making all the X bracing was making me nuts.

I was "brute forcing it" as you say. (see attached)


Charlie

[Jeff Hammond]

Oh, and Jeff...........thanks for binging this to light.

A few months ago I was working on a Zipline project.......and making all the X bracing was making me nuts.

I was "brute forcing it" as you say. (see attached)


Charlie

wow!.. that's a perfect drawing to show to the developers as a case for why this needs to be fixed in sketchup..



[edit] and really? you're building ziplines that high? looks fun.

[Pilou]

The last Fredo method (some simple indeed) without plug gives with apparently no problem of top tangency vertices
1.3239127 Nurbs (height of brace cut vertically) Pilars are 1 * 1 * 10 , brace 1 * 1 * x : unity meter
1.323908 SU

13.2391273 Nurbs (length of brace between the pilars)
13.239127 SU

14.1421356 Nurbs diagonal
14.142136 Su
Does this acceptable ? Accurate or not?

PS
(i don't reload the Fredo's file due V8 against V6 So remake my own version of Fredo's Method!

[CHARLIE__V]

[edit] and really? you're building ziplines that high? looks fun.

Jeff,
I composed a longer/detailed reply...........but? I got timed out I guess.

So, in short........yes........towers for the ZL are high here (~90' AFG)..because the grade is relatively flat like pancake. (contours @ 1' intervals are typical).

Attached screenshot depicts my participation in the project. (plan/execute pre assembly components @ grade)...............hoist by crane to place.

Beast,
Charlie

[fredo6]

The last Fredo method (some simple indeed) without plug gives with apparently no problem of top tangency vertices

Unfortunately, although the method is mathematically correct, it suffers from the lack of precision of Sketchup for rotation and parallelism of guides (even with circles of 512 segments).

One way to check that is to split the right post and the board and check the intersectio. As shown in the video, it may not be clean in certain cases.

So you need an extra step, with the Move tool, to adjust the intersection. You can do this step accurately because the SU Move tools inferences differently the intersection points (cross) and the endpoints (circular dot).

Jeff Challenge arc sinus.gif

Strangely, Ruby does not suffer this inaccuracy issue and gives a correct intersection, although the FredoScale Rotate script uses the same method (i.e. calculate the offset angle and substract it to the rotation angle).

Jeff Challenge Arc FredoScale Rotate.gif

Fredo

[fredo6]

For info, I just published the script updates for supporting the two problems featured in this mini challenge. See this post for detail and video.

This comes in FredoScale, but you just need to download LibFredo6 4.5a.

Fredo

[utiler]

You are a crazy man, Fredo!!!!!

[Pilou]

Yep!
Classieux!
And no problem in the Big Zoom!

1.3239127 Nurbs (height of brace cut vertically) Pilars are 1 * 1 * 10 , brace 1 * 1 * x : unity meter
1.323913m SU

[CHARLIE__V]

Bravo Fredo..............Bravo!

Thanks lots,

Charlie