POV-Ray : Newsgroups : povray.newusers : Weird directional issue Server Time: 25 Jun 2019 19:56:31 GMT
  Weird directional issue (Message 1 to 3 of 3)  
From: Bald Eagle
Subject: Weird directional issue
Date: 14 Jun 2016 00:20:01
Message: <web.575f4cc6c0f00ae45e7df57c0@news.povray.org>
I quickly hammered out a POV-space to help lay out small specific pieces that
need to have certain dimensions, angles, etc, and after I refamiliarized myself
with the weirdities of the orthographic camera, I noticed that my x-axis seems
reversed, as does my rotational direction around the y-axis.

Perhaps someone can point out what probably ought to be bleeding obvious.
I'll post an attachment in pbsf for convenience.

=======================================================================


#version 3.7;
#ifdef (SDL)
 // do nothing
 // Settings, includes, camera, lightsource, etc. will already be defined in
main scene file
 #debug "Variable SDL defined, skipping include file scene definition \n"
#else
 // setup scene file for independent rendering of this include file
 #debug "Variable SDL not defined, setting up include file scene definition \n"

/*
 // radiosity (global illumination) settings
 #default {finish {ambient 0 diffuse 1} }

 global_settings {

  assumed_gamma 1.0

  radiosity {
   pretrace_start 0.08           // start pretrace at this size
   pretrace_end   0.04           // end pretrace at this size
   count 35                      // higher -> higher quality (1..1600) [35]

   nearest_count 5               // higher -> higher quality (1..10) [5]
   error_bound 1.8               // higher -> smoother, less accurate [1.8]
   recursion_limit 3             // how much interreflections are calculated
(1..5+) [3]

   low_error_factor .5           // reduce error_bound during last pretrace step
   gray_threshold 0.0            // increase for weakening colors (0..1) [0]
   minimum_reuse 0.015           // reuse of old radiosity samples [0.015]
   brightness 1                  // brightness of radiosity effects (0..1) [1]
   adc_bailout 0.01/2
   //normal on                   // take surface normals into account [off]
   //media on                    // take media into account [off]
   //save_file "file_name"       // save radiosity data
   //load_file "file_name"       // load saved radiosity data
   //always_sample off           // turn sampling in final trace off [on]
   //max_sample 1.0              // maximum brightness of samples
  } // end radiosity
 } // end global settings
*/

 #include "debug.inc"
  Set_Debug (true)
 #include "colors.inc"
 #include "textures.inc"
 #include "glass.inc"
 #include "metals.inc"
 #include "golds.inc"
 #include "stones.inc"
 #include "woods.inc"
 #include "shapes.inc"
 #include "shapes2.inc"
 #include "functions.inc"
 #include "math.inc"
 #include "transforms.inc"

 #declare Feet = 12;
 //##########################
 #declare Camera_Number = 0;
 #declare Fraction = 1;
 //##########################
 #switch ( Camera_Number )
 #case (0)
  #declare Camera_Orthographic = true;
  #declare Camera_Position = <0, 0, -30*Feet> ;  // front view
  #declare Camera_Look_At  = <0, 0,  0> ;
  #declare Fraction = 8;     // functions as a zoom for the orthographic view
           // 4 zooms in 4x, 8 zooms in 8x, etc.
 #break
 #case (1)
  #declare Camera_Orthographic = false;
  #declare Camera_Position = <0, 0, -10*Feet> ;  // front view
  #declare Camera_Look_At  = <0, 0,  0> ;
 #break
 #case (2)
   #declare Camera_Position = < 0.00, 36.00, -48.00> ;  // front view
   #declare Camera_Look_At  = < 0.00, 24.00,  0.00> ;
   #declare Camera_Angle    =  65 ;
 #break
 #case (3)
   #declare Camera_Position = < 0*Feet, 2*Feet,  0*Feet> ;  // top view
   #declare Camera_Look_At  = < 0.00, 0*Feet,  0*Feet> ;
   #declare Camera_Angle    =  65 ;
 #break
 #case (4)
   #declare Camera_Position = < 0.00, 9*Feet,  27*Feet> ;  // mobile view
   #declare Camera_Look_At  = < 0.00, 0*Feet,  33*Feet> ;
   #declare Camera_Angle    =  65 ;
 #break
 #case (5)
   #declare Camera_Position = < 0.00, 6*Feet,  35*Feet> ;  // mobile view
   #declare Camera_Look_At  = < 0.00, 6*Feet,  25*Feet> ;
   #declare Camera_Angle    =  65 ;
 #break
 #else
   #declare Camera_Position = < 0.00, 1.00,-20.00> ;  // front view
   #declare Camera_Look_At  = < 0.00, 1.00,  0.00> ;
   #declare Camera_Angle    =  65 ;
 #break
 #end // end of switch ( Camera_Number )

 // #####################################
 camera {
  #if (Camera_Orthographic = true)
   orthographic
   right     image_width/(2*Fraction)
   up   image_height/(2*Fraction)
  #end
  location  Camera_Position
  look_at   Camera_Look_At}
 // #####################################

 light_source {<40*Feet, 20*Feet, -100*Feet> color rgb <1, 1, 1>*0.8}

/*
 sky_sphere {pigment {gradient <0, 1, 0>
                      color_map {[0   color rgb <1, 1, 1>         ] // White
                                 [0.4 color rgb <0.14, 0.14, 0.56>] //~Navy
                                 [0.6 color rgb <0.14, 0.14, 0.56>] //~Navy
                                 [1.0 color rgb <1, 1, 1>         ] // White
                               }
                      scale 2 }
            } // end of sky_sphere
*/



#end  // end SDL check
//###################################################################################################

 // ########################################
 // VARIABLES
 // ########################################


 // ########################################
 // Textures
 // ########################################

 // ########################################
 // OBJECTS
 // ########################################



//###################################################################################################
// Render include file scene
//###################################################################################################
#ifndef (SDL)

 #debug "Variable SDL not defined, rendering include file scene definition \n"

 #declare LineWidth = 0.2;
 #declare LineColor1 = <0, 0, 0.2>;
 #declare LineColor2 = <0.5, 0.0, 0.0>;
 #declare Grid = 30*Feet;
 #declare Plane = 12;

 plane {z, Plane pigment {Blue*0.4} }

 #for (X, 0, Grid)
  cylinder {< X, -Grid, Plane> < X, Grid, Plane> LineWidth/2 pigment {rgb
LineColor1} }
  cylinder {<-X, -Grid, Plane> <-X, Grid, Plane> LineWidth/2 pigment {rgb
LineColor1} }
  #if (X/12 = int(X/12))
   cylinder {< X, -Grid, Plane> < X, Grid, Plane> LineWidth pigment {rgb
LineColor2} }
   cylinder {<-X, -Grid, Plane> <-X, Grid, Plane> LineWidth pigment {rgb
LineColor2} }
  #end
 #end

 #for (Y, 0, Grid)
  cylinder {<-Grid,  Y, Plane> <Grid,  Y, Plane> LineWidth/2 pigment {rgb
LineColor1} }
  cylinder {<-Grid, -Y, Plane> <Grid, -Y, Plane> LineWidth/2 pigment {rgb
LineColor1} }
  #if (Y/12 = int(Y/12))
   cylinder {<-Grid,  Y, Plane> <Grid,  Y, Plane> LineWidth pigment {rgb
LineColor2} }
   cylinder {<-Grid, -Y, Plane> <Grid, -Y, Plane> LineWidth pigment {rgb
LineColor2} }
  #end
 #end

 //object {My_Object scale <1, 1, 1> rotate -y*45 translate x*12}
 sphere {<0, 0, 0> 6 pigment {White} }

//###################################################################################################

#else
 // do nothing
#end


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From: StephenS
Subject: Re: Weird directional issue
Date: 14 Jun 2016 02:09:42
Message: <575f6766$1@news.povray.org>
On 13/06/2016 8:16 PM, Bald Eagle wrote:
> I quickly hammered out a POV-space to help lay out small specific pieces that
> need to have certain dimensions, angles, etc, and after I refamiliarized myself
> with the weirdities of the orthographic camera, I noticed that my x-axis seems
> reversed, as does my rotational direction around the y-axis.
>
> Perhaps someone can point out what probably ought to be bleeding obvious.
> I'll post an attachment in pbsf for convenience.
...
At first glance
check your camera{ up<x,y,z>} vector

Stephen S


Post a reply to this message

From: Bald Eagle
Subject: Re: Weird directional issue
Date: 14 Jun 2016 03:00:00
Message: <web.575f72e7a5e18f285e7df57c0@news.povray.org>
StephenS <nom### [at] nomailcom> wrote:

> At first glance
> check your camera{ up<x,y,z>} vector
>
> Stephen S

Ah, yes, thanks -
That seems to have been it.

I changed

right     image_width/(2*Fraction)
up  image_height/(2*Fraction)

to

right     x*image_width/(2*Fraction)
up  y*image_height/(2*Fraction)

Looks like it was the ole' vector-promotion issue coupled with "DUH!"


Back on track.   For now.    ;)


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