I have an image map as an emblem on a figure.  How do I stop it from
showing up on the back, too?

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Greg, take a look at povray.newusers and my reply to Simon Adameit in the
thread 'image map' recently (today, June 16 11:06AM). subject line changed
to "image map (cylindrical warping)" which Warp suggested doing.

bob h

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Thanks but ugh.  So I'd need an image that itself is able to wraparound,
instead of just a tiny little "decal"?

bob h wrote:

> Greg, take a look at povray.newusers and my reply to Simon Adameit in the
> thread 'image map' recently (today, June 16 11:06AM). subject line changed
> to "image map (cylindrical warping)" which Warp suggested doing.
>
> bob h

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"Greg M. Johnson" <"gregj;-)56590\""@aol.c;-)om> wrote in message
news:3d0d4c72@news.povray.org...
> I have an image map as an emblem on a figure.  How do I stop it from
> showing up on the back, too?
>

I did a model of a ship a while back and to put the logos on I used an
image_map incorporated into an object pattern.  I think the object pattern
is one of my favourite new features of 3.5, very useful.

-tgq

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Try using a slope_map.

Greg M. Johnson wrote:

> I have an image map as an emblem on a figure.  How do I stop it from
> showing up on the back, too?
> 
> 


-- 
Samuel Benge

sbe### [at] caltelcom

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"Greg M. Johnson" <"gregj;-)56590\""@aol.c;-)om> wrote in message
news:3d0e8a75@news.povray.org...
> Thanks but ugh.  So I'd need an image that itself is able to wraparound,
> instead of just a tiny little "decal"?

I think scaling can be done to any size image but of course the aspect ratio
still matters. Just doesn't need to be wrappable.

bob h

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Samuel Benge <sbe### [at] caltelcom> wrote:
> Try using a slope_map.

  slope_map is related to normals, not pigments.

-- 
#macro N(D)#if(D>99)cylinder{M()#local D=div(D,104);M().5,2pigment{rgb M()}}
N(D)#end#end#macro M()<mod(D,13)-6mod(div(D,13)8)-3,10>#end blob{
N(11117333955)N(4254934330)N(3900569407)N(7382340)N(3358)N(970)}//  - Warp -

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> > Try using a slope_map.
>
>   slope_map is related to normals, not pigments.
>
I think he must be refering to the slope pattern from 3.5 and megaPOV.
Should be able to work though it wouldn't be my prefered method.

-tgq

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Thanks for all the conversation, but here's the application:

I have a blob human figure.  I want a little emblem on the chest (like the
"4" on Reed Richards or the "S" on Superman.)  A map_type 0 allows me to
nicely place a bitmap which is "just the emblem", a square, on the chest,
but also puts it on the back.  A map_type 2 (is that cylindrical?)  takes my
bitmap and wraps it around the hole perimeter of my object, while wildly
distorting it.

I want:
EMBLEM
EMBLEM
EMBLEM

I'm afraid map_type 2 would require a bitmap like this  below, with a huge
headache of trying to decide how much extra --- solid color to add:

------------------EMBLEM---------
------------------EMBLEM---------
------------------EMBLEM---------

I'm stuck with Mega 0.7 for now for personal reasons.  And I don't
understand a slope_map application for this problem.

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> nicely place a bitmap which is "just the emblem", a square, on the chest,
> but also puts it on the back.  A map_type 2 (is that cylindrical?)  takes
my
> bitmap and wraps it around the hole perimeter of my object, while wildly
> distorting it.
>
> I want:
> EMBLEM
> EMBLEM
> EMBLEM
>
> I'm afraid map_type 2 would require a bitmap like this  below, with a huge
> headache of trying to decide how much extra --- solid color to add:
>
> ------------------EMBLEM---------
> ------------------EMBLEM---------
> ------------------EMBLEM---------
>
> I'm stuck with Mega 0.7 for now for personal reasons.  And I don't
> understand a slope_map application for this problem.

(I think) megaPOV has the object pattern, though I'm not sure if the syntax
is exactly the same as in 3.5, but here is an example of how to use it in
3.5:


//start
pigment{
  object{
    box{<-1,-1,0><1,1,0>} //where to place the square emblem on the man's
body (make sure this object only intersects the front half
    //This box assumes the man us upright in the y direction and faces the z
direction
    pigment{Pigment_Outside_The_Emblem} //pigment outside box
    ,
    pigment{  //pigment inside box
      image_map{sys "EmblemImage" interpolate 4}
      translate<-.5,-.5,0>
      scale <2,2,1>
    }
  }
}
//end

let me know if this of use or if you don't fully understand it.
g'luck

-tgq

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