[Debian-astro-commits] [gyoto] 50/221: Screen: add the x -> -x transformation for SphericalAngles

[Thibaut Jean-Claude Paumard]

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thibaut pushed a commit to branch master
in repository gyoto.

commit 1556512862b395ddbef9d1da056db22fbda0b1b2
Author: Frederic <frederic at MacFrederic.local>
Date:   Wed Oct 15 12:04:11 2014 +0200

    Screen: add the x -> -x transformation for SphericalAngles
---
 lib/Screen.C | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/lib/Screen.C b/lib/Screen.C
index 2adf768..de4c181 100644
--- a/lib/Screen.C
+++ b/lib/Screen.C
@@ -364,9 +364,10 @@ void Screen::getRayCoord(const size_t i, const size_t j, double coord[]) const {
      */
     xscr = double(i-1)*fov_/(2.*double(npix_-1));
     yscr = double(j-1)*2.*M_PI/double(npix_-1);
-    getRayCoord(xscr, yscr, coord);
-    // NB: there will be also a X->-X transformation needed,
-    // that must be done when plotting the image
+    getRayCoord(xscr,M_PI-yscr, coord);
+    // NB: here xscr and yscr are the spherical angles
+    // a and b ; the b->pi-b transformation boils down
+    // to performing X->-X, just as below for equat angles.
   }else{
     /*
       GYOTO screen labelled by equatorial
@@ -472,6 +473,7 @@ void Screen::getRayCoord(double alpha, double delta,
   spherical_angle_a=s1tmp;
   spherical_angle_b=s2tmp;
 
+
   /* 
      Tangent vector of incident photon in observer's local frame
      vel is thus orthogonal to observer's 4-velocity

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