[GDS|Entropy] wrote:
> Yo,
Yo
> 
> Dunno about meshes, but with "solid" pov primitives, it should work...
> 
Yes, in fact the bottles *are* meshes and that is roughly how I did it 
in the picture. I used a plane for the intersection but a box would 
probably have been more efficient. Mesh will do CSG if an inside_vector 
is defined.  But the larger question was about the possibility of 
keeping the level of the ink physically accurate for a constant volume. 
  The ink bottle portrayed is a bottle for 'tusche' which is a heavy 
gloppy sort of ink, like India ink, and it does tend to dry and cake 
onto the inside of the bottle.  Because I am controlling the generation 
of the mesh in a loop anyway it should be possible to apply a procedural 
texture to just the interior part of the bottle and get something close.

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Chris B wrote:

> 
> 
> Hi Jim,
> 
> I've been working on a label generator over the last few days. The objects I 
> sent in for the 'office supplies' subject both needed labels, so I took the 
> code I wrote for them to make a generic labelling system. As of this morning 
> it generates either flat or cylindrical labels using layers of pigment to 
> incorporate combinations of POV-Ray objects and image maps.
> 
> By coincidence, yesterday I was thinking about how to do labels for rounded 
> boxes/superellipsoids though I haven't coded that up yet. I was thinking of 
> using the width, the depth and the roundness of the corners to control the 
> shape of a label. The label width would control how far around the sides of 
> the container the label stretched. Any ideas for anything that might make it 
> more useful to you?
> 
It might very well be!  Assuming you are using bi-cubic patches, that 
was one approach I was also considering.  The 'cross sections' of the 
bottles are  modelled with splines using the colefax spline files.  It 
certainly would be easy to generate 16 points along the bottle's surface 
from those spline definitions.  But the labels on the ink bottles are 
often continuous around the outside which might be trickier to do if 
such total accuracy were needed, that is why I was also considering 
generating uv vectors along with the mesh triangles, at least for a 
certain portion of the bottle.  But either way my attitude was that I 
would provide the means such that the artist could change the label, in 
the simplest case, by just providing an image_map. Your system still 
might integrate well in that case too.

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The normals seem a touch overdone, but otherwise this is practically 
perfect. :-)

-- 
William Tracy
afi### [at] gmailcom -- wtr### [at] calpolyedu

Running "beautifully fast" on modern hardware is somewhere between "I've 
never been to jail" and "I shower daily" on the list of human 
accomplishment.
     -- phi### [at] philwelchnet, posting on Slashdot

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"Jim Charter" <jrc### [at] msncom> wrote in message 
news:47aef6c3$1@news.povray.org...
> Chris B wrote:
>> I've been working on a label generator over the last few days.
>>  ... snip ...
>> By coincidence, yesterday I was thinking about how to do labels for 
>> rounded boxes/superellipsoids though I haven't coded that up yet. I was 
>> thinking of using the width, the depth and the roundness of the corners 
>> to control the shape of a label. The label width would control how far 
>> around the sides of the container the label stretched. Any ideas for 
>> anything that might make it more useful to you?
>>
> It might very well be!  Assuming you are using bi-cubic patches, that was 
> one approach I was also considering.

At the moment I've used CSG, but the SDL is split into two parts and 
modularised to make it easy to extend:

1. There's a label design file, in which you can render the label design 
laid out flat. The design is built up of as many layers as you need. Each 
layer can contain image maps, POV-Ray pigments, object pigments, text blocks 
etc.

2. There's a series of macros, each of which creates a label object of a 
particular shape, based on standardised variables to control the size, then 
wraps the texture around onto its surface. The Width variable defines how 
far around the object the label extends and therefore defines whether it's 
continuous or whether there's a gap round the back.

For a new shape or new texture mapping technique (e.g. bi-cubic patches or 
uv mapping), a new macro can be added. By using standardised variables to 
describe the main attributes it makes it easy for a label designed for one 
object shape to be wrapped around a different shape.

I did a rounded box label shape macro yesterday. Once I've wrapped a texture 
onto it I'll post an image. Do you have a label design for the square 
ink-bottle that I could maybe use as an example - a scan, a sketch or a 
description that I could interpret?

Regards,
Chris B.

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"Chris B" <nom### [at] nomailcom> wrote in message 
news:47b0295f$1@news.povray.org...
>
> I did a rounded box label shape macro yesterday. Once I've wrapped a 
> texture
> onto it I'll post an image.
>

Here's what I've got so far. Virtually everything is configurable, including 
all of the text and the shapes and colours used. The radius of the corners 
and the lengths of the sides can all be set and the label will adjust itself 
to fit. The width of the label can be the same as the circumference of the 
bottle or less, in which case it'll wrap round the bottle for as far as 
necessary.

The first image shows the label as it renders in design mode.
The second shows a label doing a complete circuit of a rounded box and 
meeting at the back.
The third shows one that wraps round as far as the back corners.

Regards,
Chris B.

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Attachments:
Download 'InkBottleLabel2.jpg' (15 KB) Download 'InkBottleLabel.jpg' (14 KB) Download 'InkBottleLabelDesign.jpg' (18 KB)

Preview of image 'InkBottleLabel2.jpg'

Preview of image 'InkBottleLabel.jpg'

Preview of image 'InkBottleLabelDesign.jpg'

Chris B wrote:
  Do you have a label design for the square
> ink-bottle that I could maybe use as an example - a scan, a sketch or a 
> description that I could interpret?
> 
This was the source for it:

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Attachments:
Download 'tusche.jpg' (34 KB)

Preview of image 'tusche.jpg'

"Jim Charter" <jrc### [at] msncom> wrote in message 
news:47b0fd60@news.povray.org...
> Chris B wrote:
>  Do you have a label design for the square
>> ink-bottle that I could maybe use as an example - a scan, a sketch or a
>> description that I could interpret?
>>
> This was the source for it:
>

Here's what I've got so far.
Any good?

Regards,
Chris B.

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Attachments:
Download 'TuschePerspective.jpg' (19 KB) Download 'TuscheOrthographic.jpg' (28 KB)

Preview of image 'TuschePerspective.jpg'

Preview of image 'TuscheOrthographic.jpg'

Chris B wrote:
> "Jim Charter" <jrc### [at] msncom> wrote in message 
> news:47b0fd60@news.povray.org...
> 
>>Chris B wrote:
>> Do you have a label design for the square
>>
>>>ink-bottle that I could maybe use as an example - a scan, a sketch or a
>>>description that I could interpret?
>>>
>>
>>This was the source for it:
>>
> 
> 
> Here's what I've got so far.
> Any good?
> 
> Regards,
> Chris B. 
> 
> 
> 
excellent   I will play creating some uv's

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Here's a first try

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Attachments:
Download 'inkbottle.0024.jpg' (56 KB)

Preview of image 'inkbottle.0024.jpg'

"Jim Charter" <jrc### [at] msncom> wrote in message 
news:47b28209@news.povray.org...
>  Here's a first try
>

I've just emailed you a slightly higher resolution image with brighter 
colours.

I spent last night working on a macro for a label to go round angled 
multi-facetted polyhedron with bevelled and rounded corners, such as your 
octagonal bottle. I've got the macro to do the shape. I'll be working on the 
image definition for that as time allows. Do you have a picture of its 
label?

Does that new grey one have any sort of label?

Regards,
Chris B.

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