POV-Ray : Newsgroups : povray.binaries.images : Sheared supertori Server Time: 17 Feb 2019 22:37:59 GMT
 Sheared supertori (Message 1 to 7 of 7)
 From: Tor Olav Kristensen Subject: Sheared supertori Date: 23 Jan 2010 00:35:44 Message: <4b5a4460@news.povray.org>
```Jim's question in povray.advanced-users about usage of the Shear_Trans macro
made me play around with shearing of different shapes.

This image shows some supertorus isosurfaces sheared in different directions.

--
Tor Olav
http://subcube.com
```

Attachments:

Preview of image 'sheared_supertori.jpg'

 From: Jim Holsenback Subject: Re: Sheared supertori Date: 23 Jan 2010 13:22:32 Message: <4b5af818@news.povray.org>
```"Tor Olav Kristensen" <tor### [at] TOBEREMOVEDgmailcom> wrote in message
news:4b5a4460@news.povray.org...
>
> macro
> made me play around with shearing of different shapes.
>
> This image shows some supertorus isosurfaces sheared in different
> directions.

WOW .... care to post the code? I've been looking for something to twiddle
with between between projects.

Jim
```
 From: Jim Charter Subject: Re: Sheared supertori Date: 23 Jan 2010 14:32:21 Message: <4b5b0875\$1@news.povray.org>
```Tor Olav Kristensen wrote:
>
> macro
> made me play around with shearing of different shapes.
>
> This image shows some supertorus isosurfaces sheared in different
> directions.
>
>
> ------------------------------------------------------------------------
>
Beautiful effect, makes me think, a little, of soapstone carving.  The
method gives an interesting insight also. Applying the shearing macro to
an iso-surface is something I would not have expected.  Being a mere
mortal with maths, I would have guessed, rather, that you'd done the
shearing with the iso-surface function somehow.
```
 From: Thomas de Groot Subject: Re: Sheared supertori Date: 23 Jan 2010 16:05:06 Message: <4b5b1e32\$1@news.povray.org>
```"Jim Charter" <jrc### [at] msncom> schreef in bericht
news:4b5b0875\$1@news.povray.org...
>>
> Beautiful effect, makes me think, a little, of soapstone carving.  The
> method gives an interesting insight also. Applying the shearing macro to
> an iso-surface is something I would not have expected.  Being a mere
> mortal with maths, I would have guessed, rather, that you'd done the
> shearing with the iso-surface function somehow.

Yes indeed, and within the isosurface function, there is a shear code that
can be used, I remember from my *ancient* geomorph macro. It is explained in
the isosurface part of the docs iirc   :)

Thomas
```
 From: Alain Subject: Re: Sheared supertori Date: 23 Jan 2010 17:49:05 Message: <4b5b3691\$1@news.povray.org>
```Le 2010-01-23 11:05, Thomas de Groot a écrit :
> "Jim Charter"<jrc### [at] msncom>  schreef in bericht
> news:4b5b0875\$1@news.povray.org...
>>>
>> Beautiful effect, makes me think, a little, of soapstone carving.  The
>> method gives an interesting insight also. Applying the shearing macro to
>> an iso-surface is something I would not have expected.  Being a mere
>> mortal with maths, I would have guessed, rather, that you'd done the
>> shearing with the iso-surface function somehow.
>
> Yes indeed, and within the isosurface function, there is a shear code that
> can be used, I remember from my *ancient* geomorph macro. It is explained in
> the isosurface part of the docs iirc   :)
>
> Thomas
>
>

Prety simple:

you just call the function like this:

My_function( x+y/2, y, z)

This will shear toward -x as y get larger.

You can do something like this:

My_function( x+(cos(y*3)+sin(z*2))*2, y, z-sin(y*3) )

and have your shape twists around.

Alain
```
 From: Tor Olav Kristensen Subject: Re: Sheared supertori Date: 24 Jan 2010 05:08:38 Message: <4b5bd5d6\$1@news.povray.org>
```Jim Holsenback wrote:
> "Tor Olav Kristensen" <tor### [at] TOBEREMOVEDgmailcom> wrote in message
> news:4b5a4460@news.povray.org...
>> macro
>> made me play around with shearing of different shapes.
>>
>> This image shows some supertorus isosurfaces sheared in different
>> directions.
>
> WOW .... care to post the code? I've been looking for something to twiddle
> with between between projects.

I've just posted two versions of the source code in this thread:

Newsgroup: povray.text.scene-files
Date: 24 Jan 2010 04:54:58
Subject: Source code for "Sheared supertori" image

--
Tor Olav
http://subcube.com
```
 From: Tor Olav Kristensen Subject: Re: Sheared supertori Date: 24 Jan 2010 05:24:15 Message: <4b5bd97f@news.povray.org>
```Jim Charter wrote:
> Tor Olav Kristensen wrote:
>>
>> macro
>> made me play around with shearing of different shapes.
>>
>> This image shows some supertorus isosurfaces sheared in different
>> directions.
>>
>>
>> ------------------------------------------------------------------------
>>
> Beautiful effect, makes me think, a little, of soapstone carving.  The

Yes, that effect is from some textures and light settings that Gilles Tran
once made. I like to play around with it.

Newsgroup: povray.binaries.images
Date: 6th August 2000

Newsgroup: povray.binaries.images
Date: 7th August 2000
Subject: Radiosity test #2 70 kbu

> The
> method gives an interesting insight also. Applying the shearing macro to
> an iso-surface is something I would not have expected.  Being a mere
> mortal with maths, I would have guessed, rather, that you'd done the
> shearing with the iso-surface function somehow.

I've made some code for doing the shearing of these shapes within the
functions for the isosurfaces, but it's a lot more work. If I finish it,
then I'll post that code too.

--
Tor Olav
http://subcube.com
```