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On 19/06/2013 9:58 AM, gharryh wrote:
> Maybe i should say warp instead of wrap.
> Als both the cylinder and the label are POV-Ray objects.
> The label is no bitmap image.
Well that is different. You did it the hard way. :-)
I don't know if applying shear transformations would bend the label the
way you want. My mathematics is not good enough.
You could rebuild the label but use a cylinder as your base. Then rotate
the characters and symbols so that they are tangential to where they
intersect the cylinder. Then intersect the characters with a slightly
larger cylinder to smooth them flush with the label.
--
Regards
Stephen
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> On 19/06/2013 9:58 AM, gharryh wrote:
>> Maybe i should say warp instead of wrap.
>> Als both the cylinder and the label are POV-Ray objects.
>> The label is no bitmap image.
>
> Well that is different. You did it the hard way. :-)
>
> I don't know if applying shear transformations would bend the label the
> way you want. My mathematics is not good enough.
> You could rebuild the label but use a cylinder as your base. Then rotate
> the characters and symbols so that they are tangential to where they
> intersect the cylinder. Then intersect the characters with a slightly
> larger cylinder to smooth them flush with the label.
>
Or use an object pattern of the content of the label for eatch colours.
Then, you can use a warp{spherical}.
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On 19/06/2013 9:23 PM, Alain wrote:
>>
> Or use an object pattern of the content of the label for eatch colours.
> Then, you can use a warp{spherical}.
Nice idea. But this is newusers, Alain.
Could you point to an example? I wouldn't mind seeing how to do this myself.
--
Regards
Stephen
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> On 19/06/2013 9:23 PM, Alain wrote:
>>>
>> Or use an object pattern of the content of the label for eatch colours.
>> Then, you can use a warp{spherical}.
>
>
> Nice idea. But this is newusers, Alain.
>
> Could you point to an example? I wouldn't mind seeing how to do this
> myself.
>
From the included documentation for the Windows version, section
3.4.7.2.5 Object Pattern.
pigment{object{Some_object color InsidePigment color OutsidePigment}}
"Some_object" must be defined in a #declare directive.
This is often used to create a pattern from a text object, but any
object can be used, both simple or complexe ones. Points that are inside
the reference object use the first item. Those outside will use the
second item.
For the warp, it is described in section 3.4.7.5.5.7 Mapping using warps.
Assuming that you created an object named "My_Text" and "My_Logo, it can
look like this:
pigment{rgb 1} // the background.
pigment{ // a red element, can be some text or anything.
object{My_Logo color rgb <1,0,0> color rgbt 1
warp{cylindrical}
translate 3*y // and move it up 3 units
once // Ensure that the pigment show only one time
}
}
pigment{ // some black element, can be some text.
object{My_Text color rgb 0 color rgbt 1
warp{cylindrical}
once
}
}
This is a layered pigment using 3 pigments with some transparency.
You can use any number of layers.
The pigment "rgbt 1" is perfectly transparent showing whatever is under.
The scaling of the X component control the fraction of the cylinder's
circonference that is covered. Normaly, you should use a value that is
less than 1. Without that scaling, the pigment get wraped all the way
around the cylinder.
The scaling of the Y component control the hight. Without it, the
pigment will be only 1 unit high.
The lower point of the pattern is always a Y=0, and, without once, will
repeat every unit up and down.
I used simple pigments, but you can use full textures. It will look like:
texture{object{My_Object texture{Texture1} texture{Texture2} }}
Alain
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Alain <kua### [at] videotron ca> wrote:
> > On 19/06/2013 9:58 AM, gharryh wrote:
> >
> Or use an object pattern of the content of the label for eatch colours.
> Then, you can use a warp{spherical}.
I have made a picture of the label.
Trying the example in the documentation i managed te get it on a cylinder.
object{
cylinder{<0,0,0><0,70,0>27.5
pigment{
image_map {
jpeg "RE55.jpg"
map_type 1
}
scale<.1,.1,.1>
}
}
}
But it seems i cant get it smaller and my knowledge of povray to do a correct
search, not knowing the the correct phrases to use, i cant find the solution.
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From: James Holsenback
Subject: Re: Want to attach one object to another
Date: 21 Jun 2013 07:10:26
Message: <51c434a2@news.povray.org>
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On 06/21/2013 05:13 AM, gharryh wrote:
> Alain <kua### [at] videotronca> wrote:
>>> On 19/06/2013 9:58 AM, gharryh wrote:
>
>>>
>> Or use an object pattern of the content of the label for eatch colours.
>> Then, you can use a warp{spherical}.
> I have made a picture of the label.
> Trying the example in the documentation i managed te get it on a cylinder.
>
> object{
> cylinder{<0,0,0><0,70,0>27.5
> pigment{
> image_map {
> jpeg "RE55.jpg"
> map_type 1
> }
> scale<.1,.1,.1>
> }
> }
> }
>
> But it seems i cant get it smaller and my knowledge of povray to do a correct
> search, not knowing the the correct phrases to use, i cant find the solution.
>
>
>
>
map_type 1 is spherical mapping ... try map_type 2 (cylindrical) then
transform (scale, translate)
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I changed a bit to get this image:
http://www.harry-arends.nl/werkgroep/images/WarpText.png
But as can be seen it warpt totatly around. The height is correct but it should
cover only 1/3rd of the cylinder.
#declare label =
object{
cylinder{<0,0,0><0,70,0>dia/2+.25
pigment{
image_map {
jpeg "RE55s.jpg"
map_type 2
once
interpolate 4
}
scale <1,24,1> // labelheight
}
}
}
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On 06/21/2013 07:39 AM, gharryh wrote:
> I changed a bit to get this image:
> http://www.harry-arends.nl/werkgroep/images/WarpText.png
> But as can be seen it warpt totatly around. The height is correct but it should
> cover only 1/3rd of the cylinder.
>
> #declare label =
> object{
> cylinder{<0,0,0><0,70,0>dia/2+.25
> pigment{
> image_map {
> jpeg "RE55s.jpg"
> map_type 2
> once
> interpolate 4
> }
> scale <1,24,1> // labelheight
> }
> }
> }
>
>
>
then maybe the once keyword isn't appropriate
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On 21/06/2013 1:25 PM, James Holsenback wrote:
> then maybe the once keyword isn't appropriate
Taking into account that the label does not use the full circumference
of a cylinder. I created a CSG intersection and tried to map that. I
found it very difficult to get the scaling right. My usual method of
doing this is to pad the outside of the image with a transparent colour
so that there are no transformations to worry about. Only working out
the size of the image within an image. I've never been happy with doing
that, though.
So I used a bi-cubic patch and planer mapping, that worked better.
I would like to see an example using cylindrical mapping so that image
was fully visible on only part of the surface.
--
Regards
Stephen
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Le 21/06/2013 13:39, gharryh nous fit lire :
> I changed a bit to get this image:
> http://www.harry-arends.nl/werkgroep/images/WarpText.png
> But as can be seen it warpt totatly around. The height is correct but it should
> cover only 1/3rd of the cylinder.
>
> #declare label =
> object{
> cylinder{<0,0,0><0,70,0>dia/2+.25
> pigment{
> image_map {
> jpeg "RE55s.jpg"
> map_type 2
> once
> interpolate 4
> }
> scale <1,24,1> // labelheight
> }
> }
> }
>
>
>
Try that:
cylinder{<0,0,0><0,70,0>dia/2+.25
pigment{
image_map {
jpeg "RE55s.jpg"
once
interpolate 4
}
scale <1/3,24,1/3> // labelheight
warp { cylindrical orientation z dist_exp 0 }
}
}
Or make RE55s.jpg three time it's current width, with a neutral colour
for the extension.
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