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"paul jones" <pdj### [at] psu edu> wrote in message
news:3e305a99@news.povray.org...
> OK, this may not be advanced.... but....
>
> How can I make a piece of paper with one curled corner and place an image
> map on it so that the image follows the curl? For the life of me I cannot
> figure out how to do this. I am modelling the paper as a mesh in Rhino and
> the image map always looks terrible.
Not exactly a real "advanced" question but certainly not basic to many
people.
I think you'd have a easy time doing the paper out of bicubic_patch then uv
map onto it. I never have uv mapped onto a mesh before. But unless you need
details like crumples and tears that's what I would use. The docs explain it
in either the UV Mapping section (6.6.7).
I haven't used Rhino but I thought it might export the texture already on
it. No idea really.
--
Farewell,
Bob
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paul jones <pdj### [at] psuedu> wrote:
> How can I make a piece of paper with one curled corner and place an image
> map on it so that the image follows the curl? For the life of me I cannot
> figure out how to do this. I am modelling the paper as a mesh in Rhino and
> the image map always looks terrible.
I suppose that the Rhino uses UV-mapping in its meshes and that it saves
it in its file format (whichever it is). The converter you are using to
convert the mesh to POV-Ray format needs to be able to convert the UV
information as well.
One possibility, as already suggested, is to use bicubic patches instead
(but you have to create them by hand or with a program like Hamapatch).
The advantage of a bicubic patch is that you can map a texture on the
patch; the UV-coordinates are calculated by POV-Ray automatically so you
don't need to do it yourself.
--
#macro M(A,N,D,L)plane{-z,-9pigment{mandel L*9translate N color_map{[0rgb x]
[1rgb 9]}scale<D,D*3D>*1e3}rotate y*A*8}#end M(-3<1.206434.28623>70,7)M(
-1<.7438.1795>1,20)M(1<.77595.13699>30,20)M(3<.75923.07145>80,99)// - Warp -
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"paul jones" <pdj### [at] psuedu> wrote in message
news:3e305a99@news.povray.org...
> OK, this may not be advanced.... but....
>
> How can I make a piece of paper with one curled corner and place an image
> map on it so that the image follows the curl? For the life of me I cannot
> figure out how to do this. I am modelling the paper as a mesh in Rhino and
> the image map always looks terrible.
>
Export from Rhino as an obj. Use poseray to convert to pov-ray (look in
binaries.utils
for the address) That way the uv-mapping is preserved. Exporting direct from
Rhino
to pov-ray looses the uv-mapping.
Gail
--
#macro G(H,S)disc{0z.4pigment{onion color_map{[0rgb<sin(H/pi)cos(S/pi)*(H<6)
cos(S/pi)*(H>6)>*18][.4rgb 0]}}translate<H-5S-3,9>}#end G(3,5)G(2,5.5)G(1,5)
G(.6,4)G(.5,3)G(.6,2)G(1,1)G(2,.5)G(3,.7)G(3.2,1.6)G(3.1,2.5)G(2.2,2.5)G(9,5
)G(8,5.5)G(7,5)G(7,4)G(7.7,3.3)G(8.3,2.7)G(9,2)G(9,1)G(8,.5)G(7,1)///GS
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