Curved_slanted_wall

lapx · 22 Mar 2008, 01:51

What's the best approach for doing a curved tilted wall of giving thickness?
See file attached. Is there a good ruby script for this?
I'm tryin to get the wall to slant to the outside at a given angle.

curve_tiltwall.skp

Gaieus · 22 Mar 2008, 02:32

Hi Lapx,

Something like this?

curve_tiltwall.skp

I copy moved it up
then used skin.rb to create a face
then used Joint PushPull to give thickness
needed some intersection and cleanup at the origin (even now it's not perfect there)
finally selected the outer edge and moved it down a bit.

fbartels · 22 Mar 2008, 10:51

Greyhead,

Beautifully done model. I love these elegantly simple yet subtle SU solutions.

Fred

lapx · 22 Mar 2008, 13:32

Geyhead,

That's It! Thanks Greyhead.

Gaieus · 22 Mar 2008, 14:07

Lapx,

Please, see my post above and the attached skippy.

GreyHead · 22 Mar 2008, 14:23

Is this more what you had in mind with the wall sloping?

For this style:

Create a upright rectangle the height and width of the wall;
Place it at the center of the spiral (at the origin along the green axis);
Use the follow-me tool to copy it along the curve;
Select the top surface only and rotate copy through 180 (this is to provide a fixed center for the next step)
Select the top surface of the wall and the copy and scale about the center to get the outer end of the wall to match the slope you want.
Clean up and smooth lines.

Bob

lapx · 22 Mar 2008, 14:27

Thanks Gaieus,

I don't see that your wall tilts outward. I'm also trying to get it to slope in the z direction as well.

lapx · 22 Mar 2008, 14:29

My next challenge is to slope the top of the wall. That is the highest part would be at the smaller radius point and the low part would be at the end of the largest radius.
At first glance I thought I could easily draw a rect and slope the top and intersect this form with spiral wall but ofcurse this will not give the desired result. Any ideas?

edit: Maybe I need to do the top wall slope part before the scaling.

Gaieus · 22 Mar 2008, 14:42

Ah, sorry. Yes obvuiously it was a misunderstanding - the top of it is slanting - not the whole wall is tilting (damn - my bad English...)

lapx · 22 Mar 2008, 15:32

That's quite alright Gaeius. We at east know how to do this when it comes up.
That's the great thing about this community is that in looking for solutions to one problem may solve another for someone else, so all is not lost.

Have a wonderful weekend!

Wo3Dan · 22 Mar 2008, 15:50

@lapx said:

My next challenge is to slope the top of the wall. That is the highest part would be at the smaller radius point and the low part would be at the end of the largest radius.
At first glance I thought I could easily draw a rect and slope the top and intersect this form with spiral wall but ofcurse this will not give the desired result. Any ideas?

edit: Maybe I need to do the top wall slope part before the scaling.

lapx,

Here is my attempt in the attached skp.
(partly Bob's solution integrated)

CurvedTiltedWall.skp

GreyHead · 22 Mar 2008, 15:55

That's neat - I didn't think of smooving to lift the spiral.

Bob

gorygreg · 23 Mar 2008, 23:25

@wo3dan said:

@lapx said:

My next challenge is to slope the top of the wall. That is the highest part would be at the smaller radius point and the low part would be at the end of the largest radius.
At first glance I thought I could easily draw a rect and slope the top and intersect this form with spiral wall but ofcurse this will not give the desired result. Any ideas?

edit: Maybe I need to do the top wall slope part before the scaling.

lapx,

Here is my attempt in the attached skp.
(partly Bob's solution integrated)

As a newbie, I almost get this!
I do remeber another tutorial by someone on the forum, who demonstrated the Scene 3 technique. The one that copies and flips 180 degrees to have a center point. Can you elaborate again one why this is done? Then I will fully get it!
Great job!

lapx · 24 Mar 2008, 00:24

Wo3Dan great job. One tip though, would it not be easier to use the contour from scratch in lieu of hand stitching? Just have to erase to to clean up excess.

Wo3Dan · 24 Mar 2008, 01:33

gorygreg,

My attempt to try to explain is in the attached skp.

@lapx said:

Wo3Dan great job. One tip though, would it not be easier to use the contour from scratch in lieu of hand stitching? Just have to erase to to clean up excess.

Lapx,

Leaving the top face in the curved boundary when using the Smoove tool will often result in an irragular pattern of triangles. I find it hard to correct all these lines. Better to do hand stitching, letting you make small adjustments to make cross sections horizontal at the top (if necessary).

I don't know how you are going to apply the "contour from scratch" tool here.
Maybe I can learn something. In my opinion SU will make a mess of all the extra lines (edges) within the curves. So what did you mean?

Wo3Dan

Scaling symetrical object.skp

GreyHead · 24 Mar 2008, 06:51

@unknownuser said:

I do remember another tutorial by someone on the forum, who demonstrated the Scene 3 technique. The one that copies and flips 180 degrees to have a center point. Can you elaborate again one why this is done? Then I will fully get it!
This is done here because we want to keep the inner end of the wall vertical. The scale tool will leave the 'center' of the shape unchanged. But the center of a spiral is not at the inner end (see spiral_1). Copy-rotating the spiral gives a new shape where the scaling center is at the center of rotation and when you scale this shape the center of the spiral remains unchanged.

Bob

dtrarch · 24 Mar 2008, 15:33

lapX

Just back from ski trip so a little late to all this but if the attached is what you wanted just let me know.

dtr

Curved tilt wall+thickness.skp

lapx · 24 Mar 2008, 21:44

@Wo3Dan,

Great explaination on that scaling issue. I figued this was the case your explaination reaffirmed. Thanks!
On the "contour from scratch" I just selected the top edge of the wall and used SU's contour from scratch. From first glance it seamed to work fine with a little clean up.
I will look at it again.

@dtracrh,
My walls would be titlted out ward as it follows the path. However, I would be interested in
what method you chose to arrive at your conclusion.

Wo3Dan · 24 Mar 2008, 22:43

@lapx said:

@Wo3Dan,.......
On the "contour from scratch" I just selected the top edge of the wall and used SU's contour from scratch. From first glance it seamed to work fine with a little clean up.
I will look at it again.
......

lapx,

Now I see what you mean, not "contour from scratch" (and not "from scratch" either) but "From Contours".
And you are quite right, that works perfect when no height corrections are needed.
When you have both the inner and the outer curves selected (spirals in scene 4, without their connecting edges at beginning and end) and apply "From Contours" you get a very good result that only needs some cleaning up.
I guess I was to much focused on "what if height corrections are needed for horizontal cross sections at the top of the wall". Even though the curves are slanted it's best to apply "From Contours".
(Leaving the face in scene 3 > 4 will give bad results when applying the "Smoove" tool)
Well, as I said: "maybe I can learn something".
Thanks for the suggestion.

Wo3Dan

lapx · 25 Mar 2008, 01:51

Thanks for clearing that up for me