FIXED infinite loop in vtk mesh stencil writer

Prevented by providing non-zero dimension and spacing to compute
the stencil (automatically compute dimension if equals to zero)

sdk/actions/mesh/basicmesh/MeshToImageStencil.cpp

@@ -65,7 +65,7 @@ MeshToImageStencil::MeshToImageStencil(ActionExtension* extension) : Action(exte
     Property* originProperty = new Property(tr("Origin"), QVariant(QVector3D(0.0, 0.0, 0.0)), tr("The origin frame position"), "");
     addParameter(originProperty);
 
-    Property* spacingProperty = new Property(tr("Spacing"), QVariant(QVector3D(0.0, 0.0, 0.0)), tr("The spacing between each voxel"), "");
+    Property* spacingProperty = new Property(tr("Spacing"), QVariant(QVector3D(1.0, 1.0, 1.0)), tr("The spacing between each voxel"), "");
     addParameter(spacingProperty);
 
     Property* outputFileProperty = new Property(tr("Output file"), "", tr("The output filename"), "");
@@ -124,10 +124,18 @@ Action::ApplyStatus MeshToImageStencil::process(MeshComponent* comp) {
 
     // compute dimensions
     int dim[3];
-    dim[0] = dimension.x();
-    dim[1] = dimension.y();
-    dim[2] = dimension.z();
-
+    // if no dimension are specified used the bounds and spacing to compute a default value
+    if (dimension.x() == dimension.y() == dimension.z() == 0.0) {
+        for (int i = 0; i < 3; i++) {
+            dim[i] = static_cast<int>(ceil((bounds[i * 2 + 1] - bounds[i * 2]) / spacing[i]));
+        }
+        CAMITK_WARNING(QString("Dimensions not set → set to (%1,%2,%3), deduced using bounds and spacing").arg(dim[0]).arg(dim[1]).arg(dim[2]));
+    }
+    else {
+        dim[0] = dimension.x();
+        dim[1] = dimension.y();
+        dim[2] = dimension.z();
+    }
     colorImage->SetDimensions(dim);
     colorImage->SetExtent(0, dim[0] - 1, 0, dim[1] - 1, 0, dim[2] - 1);
 
@@ -160,8 +168,6 @@ Action::ApplyStatus MeshToImageStencil::process(MeshComponent* comp) {
     vtkSmartPointer<vtkImageStencil> imgstenc = vtkSmartPointer<vtkImageStencil>::New();
     imgstenc->SetInputData(colorImage);
     imgstenc->SetStencilConnection(pol2stenc->GetOutputPort());
-
-
     imgstenc->ReverseStencilOff();
     imgstenc->SetBackgroundValue(outval);
     imgstenc->Update();