Steve
(First method)
Having some fun relating to your little tute principles.

(REALLY need info on the dooing of the second one though!)

Hi Brian,

Looking good there.

>>>(REALLY need info on the dooing of the second one though!)

I will point you in the right direction:-

If you look at the image in post 9, you will see that it is in 12 sections. So, I first created a plain dish/bowl, I made boolean cuts (with lines) to leave me a 12th of the bowl (30 deg) I then created a curve to boolean off the top rad, then created the pattern in 2d and projected to surface. On the projected surface lines I made pipes, that I then boolean out of the surface, I then made circle array with that section, and boolean them together to make the full bowl. I then made fillet around the top edges.

I hope that helps, if not, I will post some pics with a better explanation.

I have started another bowl, this will have much more etching, I have just got to making a nice pattern on the top edge, but MoI is taking a long time in calculating.


up to now:-

Steve
My mind is working overtime-----will ponder on all that and be back-------well,---later!
(What great mental fun!)
Brian

As you can see Steve, I am learning!

Still need a bit of instructions on getting fine "etching" on multy curved faces though!

Thanks for one of my GREAT learning days.

Brian

Hi Brian,

For the etching, you need to project to surface.

As with the example, at the stage of when you have just the one section, draw the pattern you want to cut out of the surface, make sure it is from one of the main view (it just makes it easier).



Then in the example, I have projected (curve~ project) in the right view onto the outer surface



Then its just a case of creating a pipe (whatever size you want) onto each projected curve,



The boolean them out.

Hi Brian,

I forgot to mention. If you use sweep on the projected lines (sweeping a circle for example), then you can select the "pointy ends" option which can give some good results:-

How simplicity can be be make some beautiful forms!

It's 6.15 pm. I guess I best leave that new fun for tomorrow.
Thanks.

Well I could not rest untill I had tried it out!

Hi Brian,

Looks good.

Just be cautious of overlapping tubes/pipes on the surface when making boolean as I have seen some problems.

First one can be seen on simple boolean of 2 tubes at angle:-


Made boolean union, with result:-


The workaround for the above is to make the pipes different sizes (even is only by .001)



I have also seen problems due to where the seam of the pipe is in relation to the surface. I will have to find good repeatable example to show.

- Steve

Thanks Steve. It was some good learning exercises.

I can not duplicate that boolean problem?
Can you explain specifically how you had it happen? I tried all sorts of angles without problems.

Brian

Hi Brian,

>>>I can not duplicate that boolean problem?

Strange,... OK, I will look at my setup, with possible re-installation (of OS if needed).


I did play a little more, and made booleans to produce:-



But have not rendered it yet.

- Steve

On one of those bubbled surface Pewter Tankards? (Glass bottom ?)
Then, in an appropriate scene, and rendered at 300ppi (10x8) for Michael to print out for his desk!

Show us!

Sometimes I should keep my mouth closed!
Really strained MoI. A 61.5MB 3DM file!
Must be a way to get smaller file sizes?
Anyway. Good learning again.

Using the Plain version 3DM Moi file-=--- only 512kb!
Then playing around with shaders in Carrara6Pro

Hi Brian,

>>>I can not duplicate that boolean problem?
Can you explain specifically how you had it happen? I tried all sorts of angles without problems.

I have just re-checked on a restored image of a clean installation of XP, but still seeing the same problem

When you looked at this, did you attempt to union 2 pipes created from sweep (or the pipe command from Michael).
I know that a union of 2 solid cylinders does work correctly.(but I am looking at this from the point of sweep/pipe along projected lines)

- Steve

Hi Steve - could you please post or send a .3dm model file with the problem geometry? That would definitely help in reproducing the problem.

Things that kind of graze each other to touch only at a point does tend to be one of the more difficult areas of intersection calculations.

- Michael

Hi Michael,

The example is just 2 pipes, created on plane using your pipe script.(attached)

I am actually now seeing quite a few problems with booleans, usually when a boolean crosses a previous cut.

-Steve

> The example is just 2 pipes, created on plane using your pipe script.(attached)

Thanks, yup definitely a bug, the intersector appears to be having difficulty getting one piece of the intersection curve, you can see this if you select them and run Construct / Curve / Isect to create the surface/surface intersection curves.


> I am actually now seeing quite a few problems with booleans, usually
> when a boolean crosses a previous cut.

Yeah definitely the amount of calculations get more complex when there are more edges and pieces running into each other, particularly if you end up having small fragments involved.

Definitely send these on over when you run into them. Probably for many of them I will have to collect them up and send them to the people that make my geometry library and wait for them to fix them which will take some time. But eventually progress can be made on them.

- Michael

Hi Michael,

>>>Thanks, yup definitely a bug, the intersector appears to be having difficulty getting one piece of the intersection curve, you can see this if you select them and run Construct / Curve / Isect to create the surface/surface intersection curves.

But the problem is only after a sweep. If I use "solid cylinder", or "extrude a circle", then no problem. Is the problem with the boolean, or with the sweep?

I can of course put together some examples of the problems, but I would prefer to find simple fully repeatable examples, then e-mail them to you. I could always leave that until after you release 2 beta, then just send any bug reports based on that (if that would be better?)



- Steve