K3DSurf forum

nextstep · Site Admin Joined: 06 Jan 2007 Posts: 539

Here it is, the "Thickness generator" script version 1.0 for MathMod-3.1 and above!
This script is an implementation of the formula I made some time ago, to generate thickness for implicit surface:

denisc · Joined: 24 Apr 2013 Posts: 92

Thanks very much.

A little question,

to obtain 3 separate objets, in the export obj

i can remplace , by : ?

nextstep · Site Admin Joined: 06 Jan 2007 Posts: 539

Hi,
The PrettyBall object is already formed by three separate objects.
I you want to export each one in a separate .obj file, the best way to do it is by erasing two components each time from the script, generate the last remaming object and then export as .obj file.
To erase two components from the script, you can use the button "Cut" in the "Model details" tabulation. This button erase the current component from the script and all it's dependencies so you don't have to deal with the script which can be confusing especially for big ones...
Hope this can help!
_________________
Cheers,
Abderrahman

nextstep · Site Admin Joined: 06 Jan 2007 Posts: 539

Hi all,
In this second version of the "Thickness generator" script, we explore ways of applying some transformations (scaling, stretching and bending) to a given mathematical object.
We start with a cylinder filled with Gyroidal structure (third image), The first image shows the result of bending the cylinder to form a torus. The second image is the result of applying an helicoidal transformation to the cylinder.
The attached script is for the first image.
PS: When bending the cylinder to form the Torus, the Gyroidal structure at both extreme sides of the Y axis doesn't seem quite right as the remaining of the Torus...is there a way to eliminate this behavior, I mean, a better bending transformation than the : (x,y,z)--> (sqrt(x^2+y^2) - r2, y, z) ?
MathMod script:

denisc · Joined: 24 Apr 2013 Posts: 92

hello

i did that , before post my question.

I was thinking to your examples in k3dsurf chain and chain2.

Perhaps this formula is a little special for that ?

Or you are not implant the fonction, because , in math mod there is just

chain 2 example ?

ps; this new way to write script is very interresting !

nextstep · Site Admin Joined: 06 Jan 2007 Posts: 539

Hi,
In K3DSurf the chain example with ":" can be converted to MathMod script by using multiples components separated by ",".
The MathMod way of visualizing many components is however more powerful than what you can find in K3DSurf because in MathMod, each component can have it's own definition domain, grid resolution or colors where in K3DSurf this is not possible.
Technically you can make K3DSurf visualize the PrettyBall object but you have to deal with many partial derivative functions. Also the result will not show up as good as with MathMod (limited grid resolution, unique coloring...)
Remember, K3DSurf is very good for showing unique mathematical object . MathMod is all about showing and managing multiples models in the same "scene"
_________________
Cheers,
Abderrahman

denisc · Joined: 24 Apr 2013 Posts: 92

hello

Sorry to make the disturb in your new topic,

but, if i try to

((sqrt(x*x+y*y)-3)^2+z*z-0.4)*((sqrt((x-4.5)*(x-4.5)+z*z)-3)^2+y*y-0.4)*((sqrt((x+4.5)*(x+4.5)+z*z)-3)^2+y*y-0.4)*((sqrt((y+4.5)*(y+4.5)+z*z)-3)^2+x*x-0.4)*((sqrt((y-4.5)*(y-4.5)+z*z)-3)^2+x*x-0.4)*((sqrt(x*x+y*y)-5)^2+z*z-0.4)

change by

((sqrt(x*x+y*y)-3)^2+z*z-0.4),((sqrt((x-4.5)*(x-4.5)+z*z)-3)^2+y*y-0.4),((sqrt((x+4.5)*(x+4.5)+z*z)-3)^2+y*y-0.4),((sqrt((y+4.5)*(y+4.5)+z*z)-3)^2+x*x-0.4),((sqrt((y-4.5)*(y-4.5)+z*z)-3)^2+x*x-0.4),((sqrt(x*x+y*y)-5)^2+z*z-0.4)

in mathmod 3.1, i am a error message

error at position 29 ,((sqrt((x-4.5)*

and the second probleme is the import of obj in wings3D don't work , with

models make with mathmod .

( wait a little , i post new exemples, in my last post with old and new pictures, somes with formula)

cheers

ps: yes i understand, with your new explations that

MathMod is all about showing and managing multiples models in the same "scene"

it is a question of time , but of course, it's a better way .

nextstep · Site Admin Joined: 06 Jan 2007 Posts: 539

Hi,
Here it is the MathMod script for the chain example.
This script is not , however, the best one you can write for MathMod...why?
One way to make it more interesting is to change the domain definition of each components because every torus can be defined independently of the others: This will increase the resolution of your model without having to increase the grid. This is very useful thing because , for example, you can make interesting real time animation at low grid resolution

denisc · Joined: 24 Apr 2013 Posts: 92

Thanks .

That work, but the little problem is:

It's equal result when you export your model to obj.

You have no separate objets or group objets, on your 3D prog after?

(I test with hexagon and 3Dwing) ?

cheers

nextstep · Site Admin Joined: 06 Jan 2007 Posts: 539

Hi all,
This is a twisted cube filled with the Schwarz-P structure.
The third image is the result of bending the cube to form a Torus...but still don't know what to do with the strange behavior at the extreme positions along the y axis! (the Schwarz-P structure seems to stretch more than it should be)
Working on it! Smile

MathMod script:

denisc · Joined: 24 Apr 2013 Posts: 92

hi

it's not very important.

Lovely SchwarzCubeTorus !

nextstep · Site Admin Joined: 06 Jan 2007 Posts: 539

Hi all,
Thanks Denisc Smile

Another variant from the "Thickness generator" script:

dupling5 by taha_ab, on Flickr

denisc · Joined: 24 Apr 2013 Posts: 92

hello

a little question

for

{
"Iso3D": {
"Description": ["TicknessGenerator-1.0 by Abderrahman Taha 24/08/2015"],
"Name": [
"TicknessGenerator"

it is possible, to have the same with K3dsurf ?

The same result , with one formula?

thanks

nextstep · Site Admin Joined: 06 Jan 2007 Posts: 539

Hi,
Yes, but for K3DSurf, you have to replace all the functions definitions in the MathMod script by there meaning.
Another way to do it is to look for the implicit functions partial derivative to achieve similar result (see http://k3dsurf.s4.bizhat.com/viewtopic.php?t=2&postdays=0&postorder=asc&start=0)

nextstep · Site Admin Joined: 06 Jan 2007 Posts: 539

Hi all,
Some interesting results...
Arena :

sherk7 by taha_ab, on Flickr

sherk12 by taha_ab, on Flickr

sherk9 by taha_ab, on Flickr

The Dome:

duplin1 by taha_ab, on Flickr
_________________
Cheers,
Abderrahman