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31 Oct 2024 18:46:01 EDT (-0400)
  Object Labels (Message 11 to 20 of 26)  
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From: kurtz le pirate
Subject: Re: Object Labels
Date: 19 Jan 2020 12:30:00
Message: <5e249218$1@news.povray.org>
On 19/01/2020 18:25, kurtz le pirate wrote:
> On 19/01/2020 07:16, Melody wrote:
> 
>> #macro label(Text,objv,r,col,top)
>> #local vl = vlength(objv-campos)/88;
>> #if (top)
>> #local pnt = camup*(r*1.05)+objv;
>> #else
>> #local pnt = -camup*(vl*FontSize+r)+objv;
>> #end
>> #local eye = vnormalize(pnt-campos);
>> object {








>> }
>> #end
> 
one question at : #local vl = vlength(objv-CamPos)/88;

88 ???



-- 
Kurtz le pirate
Compagnie de la Banquise


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From: Melody
Subject: Re: Object Labels
Date: 19 Jan 2020 18:35:01
Message: <web.5e24e6ec28c763ef9da690110@news.povray.org>
kurtz le pirate <kur### [at] gmailcom> wrote:
> On 19/01/2020 07:16, Melody wrote:

> Thank for this macro. It seems to be working perfectly.
> My firt try with **label()**
>
>
> Thanks :)
>
> --
> Kurtz le pirate
> Compagnie de la Banquise

Nice sharp font! Is that pov3.7?
Mine never looked that good.

Is that a high camera angle?
Perspective makes them tilt.

something else to understand about text - possibly correct.


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From: Melody
Subject: Re: Object Labels
Date: 19 Jan 2020 19:00:00
Message: <web.5e24ec7b28c763ef9da690110@news.povray.org>
"Melody" <nomail@nomail> wrote:
> if you're fairly quick, u have one more question looming ---
> unresolved constant of "88" -
>
> represents a perspective cancel.
>
> how much bigger to stay the same size at a distance?
>  ... so that's your home work, resolve the last constant.

so Kurtz is "fairly quick." : )

kurtz le pirate <kur### [at] gmailcom> wrote:
> On 19/01/2020 18:25, kurtz le pirate wrote:
> one question at : #local vl = vlength(objv-CamPos)/88;
>
> 88 ???
> --
> Kurtz le pirate
> Compagnie de la Banquise


Self adjusting to stay the same size at another FOV, AKA camang -

fl = 1/tan(radians(camang/Aspect/2));
// fl * centerx = actual focal length

vlen / 88 becomes ...
vlen / (fl * 23.6)
or simply vlen / fl; and resize smaller to begin with.


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From: Melody
Subject: Re: Object Labels
Date: 19 Jan 2020 19:15:00
Message: <web.5e24f08828c763ef9da690110@news.povray.org>
Aspect = Width/Heigth > 1


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From: Melody
Subject: Re: Object Labels
Date: 19 Jan 2020 21:25:00
Message: <web.5e250eab28c763ef9da690110@news.povray.org>
"Melody" <nomail@nomail> wrote:
> Aspect = Width/Heigth > 1
Don't need Aspect, just adjusts for visible height angle.
Text centering failed for different FontSize - fixed.
Screen size same for a camang change. Now its done?
There's always something more?

/*
right=up.eye
eye=right.up
up=eye.right
*/
#declare campos = <0,80,-250>;
#declare cameye = vnormalize(<20,12,0>-campos);
#declare camup = <-1,1,0>;
#declare camright = vnormalize(vcross(camup,cameye));
#declare camup = vnormalize(vcross(cameye,camright));
#declare FontSize = 1;
#declare camang = 30;

camera {
  location campos
  right camright
  up camup *(image_height/image_width)
  direction cameye*(image_height/image_width)
  angle camang
}
#include "transforms.inc"
#macro label(Text,objv,r,col,top)
#local fl = 1/tan(radians(camang/2));
#local vl = vlength(objv-campos)/(fl*20);
#if (top)
#local pnt = camup*(r*1.05)+objv;
#else
#local pnt = -camup*(vl*FontSize+r)+objv;
#end
#local eye = vnormalize(pnt-campos);
object {
  text {
    ttf "Arial.ttf" Text 1 0
    texture {  pigment { rgb col }  finish { ambient 1 diffuse 0 } }
  }
  translate -x*((strlen(Text)/2) * FontSize / (2*FontSize))
  scale vl*FontSize
  Matrix_Trans(vnormalize(vcross(camup,eye)),camup,eye,pnt)
  no_shadow
}
#end
label("HELLO 162",<60,24,80>,48,<0.0196, 0.0196, 0.2156>,1)
label("Here are 492",y* 29.9,24*.8,<0.0196, 0.0196, 0.2156>,0)

well there are now much smaller remaining constants, 20 and 1.05.


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From: Melody
Subject: Re: Object Labels
Date: 19 Jan 2020 22:20:01
Message: <web.5e251bc228c763ef9da690110@news.povray.org>
20 is just another a size factor u want to see,
and leave it at that.


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From: Melody
Subject: Re: Object Labels
Date: 20 Jan 2020 03:35:00
Message: <web.5e25661a28c763ef9da690110@news.povray.org>
Here's what you can do with it; IF you can rotate around an axis. I don't know
how in POV. vrotate() is not rotation(r,axis,pnt). If you cant, you need
triangulation.inc ... added centering option, and y adjust.
CamAng change, scale stays ...


/*
right=up.eye
eye=right.up
up=eye.right
*/
#declare campos = <0,80,-250>;
#declare cameye = vnormalize(<20,12,0>-campos);
#declare camup = <-1,1,0>;
#declare camright = vnormalize(vcross(camup,cameye));
#declare camup = vnormalize(vcross(cameye,camright));
#declare FontSize = 1.0;
#declare camang = 30;

camera {
  location campos
  right camright
  up camup *(image_height/image_width)
  direction cameye*(image_height/image_width)
  angle camang
}
#include "transforms.inc"
#macro label(Text,objv,r,col,top,center,ydeg)
#local fl = 1/tan(radians(camang/2));
#local vl = vlength(objv-campos)/(fl*20);
#if (top)
#local pnt = camup*(r*1.05)+objv;
#else
#local pnt = -camup*(vl*FontSize+r)+objv;
#end
#local eye = vnormalize(pnt-campos);
object {
  text {
    ttf "Arial.ttf" Text 1 0
    texture {  pigment { rgb col }  finish { ambient 1 diffuse 0 } }
  }
  #if (center) translate -x*((strlen(Text)/2) * FontSize / (2*FontSize)) #end
  scale vl*FontSize
 #if (ydeg) rotate y* ydeg #end
  Matrix_Trans(vnormalize(vcross(camup,eye)),camup,eye,pnt)
  no_shadow
}
#end
label("HELLO 162",<60,24,80>,48,<0.0196, 0.0196, 0.2156>,1,1,0)
label("Here are 492",y* 29.9,24*.8,<0.0196, 0.0196, 0.2156>,0,1,0)

#declare pnt = rotation(radians(camang/2.04),camup,cameye)*10+campos;
#declare d = 1;
#declare rowh = camang * 0.005;
label("Display Info 0",pnt,0,0,1,0,d)
label("Row 1",pnt,rowh * 1,0,1,0,d)
label("Row 2",pnt,rowh * 2,0,1,0,d)
label("Row 3",pnt,rowh * 3,0,1,0,d)
label("Row 4",pnt,rowh * 4,0,1,0,d)
label("Row 5",pnt,rowh * 5,0,1,0,d)

label("Row 1",pnt,rowh * 0,0,0,0,d)
label("Row 2",pnt,rowh * 1,0,0,0,d)
label("Row 3",pnt,rowh * 2,0,0,0,d)
label("Row 4",pnt,rowh * 3,0,0,0,d)
label("Row 5",pnt,rowh * 4,0,0,0,d)
label(concat("CamAng ",str(camang,0,0)),pnt,rowh * 5,0,0,0,d)


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From: Melody
Subject: Re: Object Labels
Date: 20 Jan 2020 05:45:00
Message: <web.5e25841328c763ef9da690110@news.povray.org>
So I took it to Hawaii.
Gave up on axis rotation in POV.

included triangulation.inc,
set up for 2 cameras, because Lego plane has 2 cameras.
Up
Eye
campos

or
Up2
Eye2
campos2

the rest, u can figure out.
http://news.povray.org/povray.text.scene-files/attachment/%3Cweb.5e25818b2dd48e039da690110%40news.povray.org%3E/label_m
aker_headsup.zip


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From: kurtz le pirate
Subject: Re: Object Labels
Date: 20 Jan 2020 13:20:12
Message: <5e25ef5c$1@news.povray.org>
On 20/01/2020 00:31, Melody wrote:

> Nice sharp font! Is that pov3.7?
It's 3.8-alpha

> Mine never looked that good.
nothing special though


> Is that a high camera angle?

camera angle=36

> Perspective makes them tilt.

yes, label "ptA2" seems a little bit tilted.


> something else to understand about text - possibly correct.
It's already very good.



-- 
Kurtz le pirate
Compagnie de la Banquise


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From: Melody
Subject: Re: Object Labels
Date: 20 Jan 2020 21:30:01
Message: <web.5e2661bf28c763ef9da690110@news.povray.org>
only way to improve text sharpness is print one letter at a time.
one of the luckier frames in the movie (87)
full size


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