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I'm going slightly batty with this one - any help will be greatly
appreciated.
I've got a set of objects in POVRAY coordinates and
to make them rotate/zoom/translate the location,look_at,right, up,
and direction vectors are moved around. That works fine. Then I try
to put labels into the frame so that they are stable in the viewed
frame. That is, they run along the final images X axis like a caption,
and it goes wrong most of the time. This works correctly if the view
is in the XY,XZ, or YZ plane, or
even down the 1,1,1 vector, but in between there are slight in plane
rotations of the text. They are still placed correctly though in
the final image's X,Y coordinates. Following my signature there
is a file example.pov showing this effect with Povray 3.1g.
The image contains spheres at the edges of a 100 unit cube and a
string of Mg atoms running from the origin out to 100,100,100.
Render it with
povray "+Iexample.pov" "+L/usr/common/povray31/include"
"+W640" "+H480" "+FP" "+Oexample.ppm"
In the resulting image the orientation or the ORIGINAL povray
coordinates
(those of the spheres) are now:
Y axis
o o
^
o | o
|
|
|
0 -----> o X axis
/
o o
Z axis
The logic I used was:
1. Initial coordinates had a unit rotation matrix and
RIGHT = (1.3333,0,0) (640 x 480 image)
UP = (1,0,0)
LOCATION= (-1,0,0)
LOOKAT = (0,0,0)
DIRECTION= (1,0,0)
2. The forward rotation matrix to the new view (which is part way
between
down the Z axis and the 1,1,1 vector):
0.9221, -0.1690, 0.3480
0.0612, 0.9519, 0.3001
-0.3820, -0.2555, 0.8882
3. The text is placed and then rotated by the inverse of this matrix
followed by a sign change on the 3rd column. That should place the
text in the appropriate position in the POVRAY coordinates where
the object lives. And it almost works, but not quite.
What am I doing wrong here?
Thanks,
David Mathog
manager, sequence analysis facility
Biology Division, Caltech
************************** begin example **********************
//frame: 3
// rotation matrix + offset vector
// 0.9221, -0.1690, 0.3480,
// 0.0612, 0.9519, 0.3001,
// -0.3820, -0.2555, 0.8882,
// 100.0000, 0.0000, 0.0000
//-----globals_from_povinterp----
#declare my_linearvar = 0.5000 ;
#declare my_cyclevar = 0.0000 ;
//-----various_includes----
// POV-Ray ray tracer scene file, generated by Swiss-PdbViewer 3.60
// 100 100 n 1
// File:Z:\simple.pov
// Swiss-PdbViewer can be retrieved by anonymous ftp at:
// http://www.expasy.ch/spdbv/mainpage.html
//
// POV-Ray can be retrieved at: http://www.povray.org
// Mega POV can be retrieved at: http://nathan.kopp.com/patched.htm
// N.Guex, 1995-2000
//
#version 3 // this scene uses POV-Ray 3.x syntax
#include "colors.inc"
#include "textures.inc"
// ------ COLORS ---------
#declare ATM_FINISH = finish {specular 0.9 roughness 0.001 ambient rgb
<0.3,0.3,0.3> }
#declare RIBBON_FINISH = finish {specular 0.9 roughness 0.001 ambient
rgb <0.3,0.3,0.3>}
#declare SURF_FINISH = finish {specular 0.9 roughness 0.001 ambient rgb
<0.3,0.3,0.3>}
#declare EDM1_tex = texture {pigment {colour red 0.475 green 0.000 blue
0.000 } finish {specular 1 roughness 0.001}}
#declare EDM2_tex = texture {pigment {colour red 0.475 green 0.475 blue
0.475 } finish {specular 1 roughness 0.001}}
#declare N_tex = texture { pigment { colour red 0.224 green 0.318 blue
1.000 } finish{ ATM_FINISH }}
#declare C_tex = texture { pigment { colour red 1.000 green 1.000 blue
1.000 } finish{ ATM_FINISH }}
#declare O_tex = texture { pigment { colour red 1.000 green 0.000 blue
0.000 } finish{ ATM_FINISH }}
#declare P_tex = texture { pigment { colour red 1.000 green 0.659 blue
0.075 } finish{ ATM_FINISH }}
#declare H_tex = texture { pigment { colour red 0.275 green 0.800 blue
1.000 } finish{ ATM_FINISH }}
#declare S_tex = texture { pigment { colour red 1.000 green 0.922 blue
0.000 } finish{ ATM_FINISH }}
#declare X_tex = texture { pigment { colour red 0.624 green 0.624 blue
0.624 } finish{ ATM_FINISH }}
#declare SSBnd_tex = texture { pigment { colour red 1.000 green 0.922
blue 0.000 } finish{ ATM_FINISH }}
#declare HBnd_tex = texture { pigment { colour red 0.000 green 1.000
blue 0.000 filter 0.0} finish{ ATM_FINISH }}
#declare WkHBnd_tex = texture { pigment { colour red 0.561 green 0.675
blue 0.561 filter 0.0} finish{ ATM_FINISH }}
#declare Clash_tex = texture { pigment { colour red 1.000 green 0.424
blue 1.000 filter 0.0} finish{ ATM_FINISH }}
// ------ Bonds radii ---------
#declare rRIBN = 0.06 // flat Ribbon radius
#declare rEDM = 0.025 // EDM cylinder radius
#declare rSURF = 0.025 // SURFACE cylinder radius (when not filled
surf.)
#declare r_Atm = 0.200 // atom radius
#declare r_Bnd = 0.200 // bond radius
#declare r_HBnd = 0.075 // H-bond radius
#declare CA_relativeSize = 1.000 // enlargement factor for CA
#declare rDOT_SURF = 0.05 // radius for accessible surf. dots.
#declare VDW_factor = 0.200 // changing this value will alter the
radius of "joining" atoms
// ---- Radius for atoms ----
// ---- Radius for "spacefilled" atoms end with '_' ----
#declare rMg = 5.00 * VDW_factor
#declare rMg_ = 5.10
// ---- Radius for "joining" atoms ----
// when atom radii below are all set to 1.0, you obtain a smooth
"sticks" model
// ---- some TEXT parameters ----
#declare r_UserDist = .04 // radius of distances measurement lines
#declare Label_scale = .4 // Text height in angstroms
#declare Label_XDecal = 0 // Horizontal offset from CA
#declare Label_YDecal = 0 // Vertical offset from CA
#declare Label_ZDecal = (-0.5) // offset from CA toward camera
#declare Dist_scale = .4 // Text height in angstroms
#declare Dist_XDecal = (-.6) // Horizontal offset from middle of H-bond
#declare Dist_YDecal = 0 // Vertical offset from middle of H-bond
#declare Dist_ZDecal = (-.25) // Depth offset from middle of H-bond
#declare Label_tex = texture { pigment { colour red 1.000 green 1.000
blue 0.000 } finish{ metallic }}
#declare LABEL_FINISH = finish {specular 1 roughness 0.001}
#declare Dist_tex = texture { pigment { colour red 1.000 green 1.000
blue 0.000 } finish{ metallic }}
//************ OBJECTS *********
// POV-Ray ray tracer scene file, generated by Swiss-PdbViewer
// File:Z:\simple.inc
// Swiss-PdbViewer can be retrieved by anonymous ftp from:
// http://www.expasy.ch/spdbv/mainpage.html
//
// POV-Ray can be retrieved at: http://www.povray.org
// N.Guex, 1995-1999
//
// MG 4
#declare A0_shape=union{
sphere {<5.00,5.00,-5.00>,rMg texture{X_tex}}
bounded_by{box{<3.00,3.00,-7.00>,<7.00,7.00,-3.00>}}
}
// MG 5
#declare A1_shape=union{
sphere {<10.00,10.00,-10.00>,rMg texture{X_tex}}
bounded_by{box{<8.00,8.00,-12.00>,<12.00,12.00,-8.00>}}
}
// MG 6
#declare A2_shape=union{
sphere {<15.00,15.00,-15.00>,rMg texture{X_tex}}
bounded_by{box{<13.00,13.00,-17.00>,<17.00,17.00,-13.00>}}
}
// MG 7
#declare A3_shape=union{
sphere {<20.00,20.00,-20.00>,rMg texture{X_tex}}
bounded_by{box{<18.00,18.00,-22.00>,<22.00,22.00,-18.00>}}
}
// MG 8
#declare A4_shape=union{
sphere {<25.00,25.00,-25.00>,rMg texture{X_tex}}
bounded_by{box{<23.00,23.00,-27.00>,<27.00,27.00,-23.00>}}
}
// MG20
#declare A5_shape=union{
sphere {<30.00,30.00,-30.00>,rMg texture{X_tex}}
bounded_by{box{<28.00,28.00,-32.00>,<32.00,32.00,-28.00>}}
}
// MG21
#declare A6_shape=union{
sphere {<40.00,40.00,-40.00>,rMg texture{X_tex}}
bounded_by{box{<38.00,38.00,-42.00>,<42.00,42.00,-38.00>}}
}
// MG22
#declare A7_shape=union{
sphere {<50.00,50.00,-50.00>,rMg texture{X_tex}}
bounded_by{box{<48.00,48.00,-52.00>,<52.00,52.00,-48.00>}}
}
// MG23
#declare A8_shape=union{
sphere {<60.00,60.00,-60.00>,rMg texture{X_tex}}
bounded_by{box{<58.00,58.00,-62.00>,<62.00,62.00,-58.00>}}
}
// MG24
#declare A9_shape=union{
sphere {<70.00,70.00,-70.00>,rMg texture{X_tex}}
bounded_by{box{<68.00,68.00,-72.00>,<72.00,72.00,-68.00>}}
}
// MG25
#declare A10_shape=union{
sphere {<80.00,80.00,-80.00>,rMg texture{X_tex}}
bounded_by{box{<78.00,78.00,-82.00>,<82.00,82.00,-78.00>}}
}
// MG26
#declare A11_shape=union{
sphere {<90.00,90.00,-90.00>,rMg texture{X_tex}}
bounded_by{box{<88.00,88.00,-92.00>,<92.00,92.00,-88.00>}}
}
// MG27
#declare A12_shape=union{
sphere {<0.00,0.00,0.00>,rMg texture{X_tex}}
bounded_by{box{<-2.00,-2.00,-2.00>,<2.00,2.00,2.00>}}
}
// MG10
#declare A13_shape=union{
sphere {<100.00,0.00,0.00>,rMg texture{X_tex}}
bounded_by{box{<98.00,-2.00,-2.00>,<102.00,2.00,2.00>}}
}
// MG11
#declare A14_shape=union{
sphere {<0.00,100.00,0.00>,rMg texture{X_tex}}
bounded_by{box{<-2.00,98.00,-2.00>,<2.00,102.00,2.00>}}
}
// MG12
#declare A15_shape=union{
sphere {<0.00,0.00,-100.00>,rMg texture{X_tex}}
bounded_by{box{<-2.00,-2.00,-102.00>,<2.00,2.00,-98.00>}}
}
// MG13
#declare A16_shape=union{
sphere {<0.00,100.00,-100.00>,rMg texture{X_tex}}
bounded_by{box{<-2.00,98.00,-102.00>,<2.00,102.00,-98.00>}}
}
// MG14
#declare A17_shape=union{
sphere {<100.00,0.00,-100.00>,rMg texture{X_tex}}
bounded_by{box{<98.00,-2.00,-102.00>,<102.00,2.00,-98.00>}}
}
// MG15
#declare A18_shape=union{
sphere {<100.00,100.00,0.00>,rMg texture{X_tex}}
bounded_by{box{<98.00,98.00,-2.00>,<102.00,102.00,2.00>}}
}
// MG16
#declare A19_shape=union{
sphere {<100.00,100.00,-100.00>,rMg texture{X_tex}}
bounded_by{box{<98.00,98.00,-102.00>,<102.00,102.00,-98.00>}}
}
// ------- Accessible Dot Surf. --------
//END
// ----- simple -----
object{ A0_shape } // MG 4
object{ A1_shape } // MG 5
object{ A2_shape } // MG 6
object{ A3_shape } // MG 7
object{ A4_shape } // MG 8
object{ A5_shape } // MG20
object{ A6_shape } // MG21
object{ A7_shape } // MG22
object{ A8_shape } // MG23
object{ A9_shape } // MG24
object{ A10_shape } // MG25
object{ A11_shape } // MG26
object{ A12_shape } // MG27
object{ A13_shape } // MG10
object{ A14_shape } // MG11
object{ A15_shape } // MG12
object{ A16_shape } // MG13
object{ A17_shape } // MG14
object{ A18_shape } // MG15
object{ A19_shape } // MG16
text{ttf "cyrvetic.ttf", " MG16 ",.5,0.1*x
texture{ pigment{ colour red 1.00 green 1.00 blue 1.00} finish{
LABEL_FINISH }} scale <Label_scale,Label_scale,Label_scale>
translate
<-100.000+Label_XDecal,0.000+Label_YDecal,0.000+Label_ZDecal>}
//-----captions_from_povinterp----
text{ttf "cyrvetic.ttf", "down Z->down (1,1,1)",0.0,0.0
texture{ pigment{ colour red 1.00 green 1.00 blue 1.00}finish{
LABEL_FINISH }} scale<104,104,104>
matrix <
0.9221, 0.0612, 0.3820,
-0.1690, 0.9519, 0.2555,
0.3480, 0.3001, -0.8882,
-1909.2278, -632.9749, 3498.6069
>
}
//************ CAMERA *********
camera { location < 361.3149, 311.6474, -922.2031>
direction < -0.3480, -0.3001, 0.8882>
up < -0.1690, 0.9519, 0.2555>
right < 1.2295, 0.0816, 0.5093>
look_at < 0.0000, 0.0000, 0.0000>
angle 26
}
//************ LIGHTS *********
#declare Intensity = 2
background { color rgb < 0.000, 0.000, 0.275 >}
object { light_source {<-1486.2982, 2381.7993,-2029.2732> color rgb
Intensity*1.000 }}
//END
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ingo wrote:
> David Mathog wrote:
>
> >......
> >Then I try to put labels into the frame so that they are stable in the
> >viewed frame.
>
> If it helps, here's a bit by John VanSickle, couldn't find the original so
> copied it from a scene.
>
> ////// this part by John van Sickle
> #local CamL= <0,1.6,-5>; //where the camera's location is
> #local CamE= <0,0,0>; //where the camera's look_at is
> #local CamZ= 2; //the amount of camera zoom you want
>
> #local CamD= vnormalize(CamE-CamL);
> #local CamU= vnormalize(vcross(CamD,CamR));
>
> text { ttf "arial.ttf","Your Text",0.01,0
> texture { pigment {rgb 12} }
> scale .1
> translate < 0.3,-0.45, CamZ>
> matrix < CamR.x, CamR.y, CamR.z,
> CamU.x, CamU.y, CamU.z,
> CamD.x, CamD.y, CamD.z,
> CamL.x, CamL.y, CamL.z >
> }
>
> camera {
> location CamL
> up CamU
> right CamR*4/3
> direction CamD*CamZ
> }
> ///////
>
> Ingo
>
> --
> Photography: http://members.home.nl/ingoogni/
> Pov-Ray : http://members.home.nl/seed7/
I just noticed that this routine only works with the default "sky" value.
When other
sky values are used the text is still flush, but is rotated around the center
of the image.
This dependence on the default sky is implicit in the line:
#local CamR= vnormalize(vcross(y,CamD));
The more general form is:
#local CamR= vnormalize(vcross(skyvector,CamD));
where skyvector is whatever shows up in the camera statement. Since
skyvector will
normally be perpendicular to CamD it should work ok. If you use an arbitrary
skyvector
it might be parallel to CamD, in which case all bets are off! Here's a bit
of one of my POV files
that shows the results of this calculation:
text{ttf "timrom.ttf", "Sheet 2",0.0,0.0
texture{ pigment{ colour red 1.00 green 0.00 blue 0.00 }finish{
LABEL_FINISH }} scale< 1.651, 1.651, 1.651>
translate < 0.826, -0.826,0>
matrix <
-0.0100, -0.3265, -0.9452,
0.1905, -0.9285, 0.3187,
-0.9816, -0.1769, 0.0715,
8.0728, 19.3232, -11.2022
>
}
//************ CAMERA *********
camera { location < 190.6901, 34.5692, -20.0225>
sky < 0.1905, -0.9285, 0.3187>
up < 0.1905, -0.9285, 0.3187>
right < -0.0133, -0.4353, -1.2602>
direction < -0.9816, -0.1769, 0.0715>
look_at < 10.1880, 2.0380, -6.8790>
angle 20
}
Regards,
David Mathog
mat### [at] caltech edu
Manager, Sequence Analysis Facility, Biology Division, Caltech
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