Voronoi Fracture Planes to Follow Normals

[GregBollella]

[LampShadeForCV.c4d.zip](Request Entity Too Large) I'd like the fracture planes to all be parallel to the surface normals near the fracture. Currently, it almost works but some of the fractures angle off. Ultimately, I want to create a inversion of the original fracture to be the 'lead' between pieces of glass in a Tiffany lamp.

Here's a link to a c4d file that will explain much better. You can see in the inversion some of the fracture planes are at steep angles to the surface normals.

Thanks,
Greg

https://www.icloud.com/iclouddrive/094a3ZVuI3jFwiJIFtVEVvoEQ#ForCV-07Feb23

[Dr. Sassi]

Hi Greg,

Would you mind checking the file of your URL? It feels like the project we discussed a month ago.

Cheers

[GregBollella]

Sorry, lots going on here and I grabbed the wrong file.

Here is the proper link: https://www.icloud.com/iclouddrive/08c5WVgEhMvDeeALjwNDPl-xQ#LampShadeForCV

[Dr. Sassi]

Hi Greg,

Thanks for using iCloud and the file!

Please have a look at the file below.

Is this Frame close to where you want to have it? I have animated the glass parts so you can see the frame with and without.

Cheers

CV4_2023_drs_23_MGvf_01.c4d

[GregBollella]

@Dr-Sassi Thanks Dr. Sassi!

Not quite. Since you started with a sphere (and only a single surface) the -6cm transform in the y-axis doesn't give the look I need, which is that the glass pieces on the upper part of the shade are elongated and meet at a point. Given a hemisphere with a single surface I can, through inversion, extrusions, volume builder/mesher, and filters get a very nice result, except that the pattern isn't what I need. If I use a hemisphere with an inner surface (0.2cm thick) the pattern is correct but the angles of the fracture planes is not parallel to the surface normals which results in 'lead' that is too wide and 'glass' that looks odd.

So, my next question, how can one -semi-manually place the points on a surface to give to the V. Frac. object? I see the 'Sources' input in the V. Frac. and have tried various combinations of the distribution and also the shader options but nothing, afaik, produces a pleasing distribution.

Can I use any sort of texture map or Matrix with fields to get the points as I want?

Thanks,
Greg

[GregBollella]

@Dr-Sassi Here is where I ended up.

I discovered that any object that has points can be used as a source. I created a hemisphere slightly smaller than the shade, cloned a helix of a zero'd out helix (thus just two points in the same exact 3-space position) onto it, and used it as the source. I used Push Apart and Plain effectors with a Cylinder Field to get the pattern I needed.

The V. Frac. was on a single-sided sphere and with the point distribution as above things looked good. So after a Current-State-To-Object on the pieces and inversion I extruded them. For the 'lead' I used a Volume Builder and a Mesher with smoothing to puff up the 'lead'

Here is the resulting file:
https://www.icloud.com/iclouddrive/0ccDQkdpp0vJ4_VbmyNwJifrw#LampShadeForCV-V2

Here is the render:
https://www.icloud.com/iclouddrive/055_8Ykq1W9CL10R9QkZKL7sA#TiffanyLampShadeDraft-Mar23

Greg

[Dr. Sassi]

Hi Greg,

I have no access to your files.

If you approach is working for you, fantastic!

My best wishes

[GregBollella]

@Dr-Sassi Ok. Sorry. Not sure what's going on. In the future, I will use a different method. However, it would be great if the forum allowed larger files to be included in the messages, as, for example, in the Redshift forums. This would make CV forum so much more usable!..

As always, thanks for all your efforts!!

Greg

[Dr. Sassi]

Hi Greg,

Thanks for the reply. I have an iCloud account, and typically, that works.

Larger files were discussed repeatedly over the years and obviously will not happen. Sorry to have no better reply to this.

I have used it for uploads in the previous fora my DropBox account, only to see that some people upload up to one GB for a simple question.
Companies do not test larger zip files, so I feel weird about those.
However, my DropBox is the free personal version and available (AFAIK) with 2GB of space. Besides that, Google, Adobe, and Wetransfer offer something usable.
I mention those as I do not touch private or unknown cloud stuff.

Again, sorry about all of that, as it would be better to have a pleasant exchange option, safe and fast for everyone, I agree.

Cheers

[GregBollella]

@Dr-Sassi Here they are on DropBox. Let's see if this works.

https://www.dropbox.com/s/dbri4zjj76xxb1x/LampShadeForCV-V2.c4d?dl=0

https://www.dropbox.com/s/u24e0cfygvwj180/TiffanyLampShadeDraft-Mar23.exr?dl=0

I believe I have set the correct permissions.

Please let me know if you can download them.

Greg

[Dr. Sassi]

Thanks, Greg. Very kind of you to put some extra effort into this.

Nice that you found a solution. I have obviously not understood what you needed.
The terms Normal and Parallel provided me with the wrong "internal visuals".
If we run into that again, perhaps a sketch might support finding a solution.
https://stcineversityprod02.blob.core.windows.net/$web/Cineversity_Forum_Support/2023_PROJECTS_DRS/20230317_CV4_2023_drs_23_MGvl_01.c4d.zip

Enjoy your weekend

[GregBollella]

@Dr-Sassi Ah, very nice. I can now see how I might put a design, say, a flower, into the fracture. Draw the design with a spline, smooth, subdivide a bit possibly, and place appropriately!

As always thanks for your effort!!

Greg

[Dr. Sassi]

Thanks for the feedback, Greg.

I assume you know the mechanics of Voronoi. Writing in a forum makes me want to share needed information with everyone. Sometimes that is seen as an evaluation of the one asking, which is not the case at all.

When one designs shapes, no point lives alone. A pair always creates a line in the middle distance each other. At the moment, another pair is closer to the new line taking over. As a result, the Voronoi pattern is created.
This relationship is a bit challenging to design and requires some practice.

Enjoy your weekend