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Leroy <lrw### [at] joplin com> wrote:
> Kirk Andrews wrote:
> > When using the spherical or cylindrical projection of an image map, it wraps
> > the image once around the object. Is there a way to make it wrap multiple
> > times? For example, if my image has the letter "M", can I make it wrap 8
> > "M"s around a cylinder? I've tried scaling, frequency, converting to a
> > function, etc., but I can't seem to find a way to do it without simply
> > editing the image.
> >
> > Thanks
> >
> >
> try this:
>
> sphere {
> 0,1
> pigment {
> image_map{tga "Your image.tga"}
> scale .4 //play with this
> warp {
> spherical
> orientation z
> dist_exp 1//play with this also
> }
> }
> }
Leroy <lrw### [at] joplin com> wrote:
> Kirk Andrews wrote:
> > When using the spherical or cylindrical projection of an image map, it wraps
> > the image once around the object. Is there a way to make it wrap multiple
> > times? For example, if my image has the letter "M", can I make it wrap 8
> > "M"s around a cylinder? I've tried scaling, frequency, converting to a
> > function, etc., but I can't seem to find a way to do it without simply
> > editing the image.
> >
> > Thanks
> >
> >
> try this:
>
> sphere {
> 0,1
> pigment {
> image_map{tga "Your image.tga"}
> scale .4 //play with this
> warp {
> spherical
> orientation z
> dist_exp 1//play with this also
> }
> }
> }
Exactly as Leroy has put it.
To clarify:
iamge_maps get mapped from 0,0 to 1,1 on the x-y plane and repeat (unless
'once' keyword is used). When warping to a cylindrical or spherical
mapping, the pigment (or in this case image_map pigment) is read from 0,0
to 1,1 on the x-y plane and converted to cylindrical mapping. So to get
what you want to do, after invoking the image_map in the pigment, scale the
the x-axis direction down by the number of repeats you want. Scaling the
z-axis does nothing, and scaling the y-axis will just require you to likely
have to rescale the y-axis again to get it mapped to the height you want, so
it's best to leave y and z scales at 1.
pigment{image_map {jpeg "image.jpg"} scale <1/n,1,1> warp{cylindrical}}
Where n=the number of times you want it to repeat.
The key is to scale AFTER the image_map, but BEFORE the warp.
This is applicable to repeating around the cylinder or sphere. If you want
to also repeat up and down on t either, just add the applicable scale to
the y-axis.
-tgq
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