gtDefSuntheticGrainCreate: fixed a few bugs

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

zUtil_Deformation/gtDefSyntheticGrainCreate.m

@@ -189,10 +189,7 @@ grain = gtCalculateGrain(grain, parameters);
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
 num_dets = numel(detgeo);
-grain.proj(1:num_dets) = struct( ...
-    'stack', [], 'num_cols', [], 'num_rows', [], 'bl', [], ...
-    'vol_size_x', [], 'vol_size_y', [], 'vol_size_z', [], 'shift', [], ...
-    'ondet', [], 'included', [], 'selected', [], 'centerpix', []);
+grain.proj = gtFwdSimProjDefinition([], num_dets);
 
 for n = 1:num_dets
     % Checking if we should just project all of them, or wether the user
@@ -282,7 +279,7 @@ function [gvpcs, gvd] = compute_oversampling_voxels(gv, dmvol, fedpars, voxsize)
 
     orig_gvdm = gv.dm;
 
-    counter = 0;
+    counter = 1;
     corner = (1 - (1 / vssampling)) / 2 .* voxsize;
 
     fprintf('\b\b: ')