Projection geometry: fixed small bug

Signed-off-by: Nicola Vigano <vigano@yoda.esrf.fr>

zUtil_Geo/gtGeoProjForReconstruction.m

-function proj_geom = gtGeoProjForReconstruction(projvec, omega, graincenter,...
+function proj_geom = gtGeoProjForReconstruction(projvec_sam, omega, graincenter,...
                      bbpos, bboff, detgeo, labgeo, samgeo, recgeo, rectype)
 % GTGEOPROJFORRECONSTRUCTION Projection coordinates required for
 %                            reconstructions.
@@ -80,14 +80,14 @@ function proj_geom = gtGeoProjForReconstruction(projvec, omega, graincenter,...
     detdirv_rec = gtGeoLab2Sam(detdirv(ones_omega, :), rot_omega, labgeo, recgeo, true, false);
 
     if (strcmpi(rectype, 'ASTRA_absorption'))
-        projvec = labgeo.beamdir(ones_omega, :);
-        projvec = gtGeoLab2Sam(projvec, rot_omega, labgeo, recgeo, true, false);
+        projvec_lab = labgeo.beamdir(ones_omega, :);
+        projvec_rec = gtGeoLab2Sam(projvec_lab, rot_omega, labgeo, recgeo, true, false);
+    else
+        % Normalised projection vector in REC reference
+        projvec_rec = gtGeoSam2Sam(projvec_sam, samgeo, recgeo, true, false);
+        projvec_rec = gtMathsNormalizeVectorsList(projvec_rec);
     end
 
-    % Normalised projection vector in REC reference
-    projvec_rec = gtGeoSam2Sam(projvec, samgeo, recgeo, true, false);
-    projvec_rec = gtMathsNormalizeVectorsList(projvec_rec);
-
     if (strcmpi(rectype, 'ASTRA_grain'))
         % Grain center in REC reference
         graincenter_rec = gtGeoSam2Sam(graincenter, samgeo, recgeo, false, false);