+ handle case if each face has its own color and a face has no triangles

+ do not write out fields of SoFCUnifiedSelection node
+ show wait cursor when importing parts

git-svn-id: https://free-cad.svn.sourceforge.net/svnroot/free-cad/trunk@5406 e8eeb9e2-ec13-0410-a4a9-efa5cf37419d

src/Mod/Part/Gui/Command.cpp

@@ -47,6 +47,7 @@
 #include <Gui/Selection.h>
 #include <Gui/View3DInventor.h>
 #include <Gui/View3DInventorViewer.h>
+#include <Gui/WaitCursor.h>
 
 #include "../App/PartFeature.h"
 #include "DlgPartImportStepImp.h"
@@ -452,6 +453,7 @@ void CmdPartImport::activated(int iMsg)
 
     QString fn = Gui::FileDialog::getOpenFileName(Gui::getMainWindow(), QString(), QString(), filter.join(QLatin1String(";;")));
     if (!fn.isEmpty()) {
+        Gui::WaitCursor wc;
         App::Document* pDoc = getDocument();
         if (!pDoc) return; // no document
         openCommand("Import Part");

src/Mod/Part/Gui/SoBrepShape.cpp

@@ -391,6 +391,14 @@ void SoBrepFaceSet::renderShape(const SoGLCoordinateElement * const vertexlist,
     int matnr = 0;
     int trinr = 0;
     pi = piptr < piendptr ? *piptr++ : -1;
+    while (pi == 0) {
+        // It may happen that a part has no triangles
+        pi = piptr < piendptr ? *piptr++ : -1;
+        if (mbind == PER_PART)
+            matnr++;
+        else if (mbind == PER_PART_INDEXED)
+            matindices++;
+    }
 
     glBegin(GL_TRIANGLES);
     while (viptr + 2 < viendptr) {
@@ -503,6 +511,14 @@ void SoBrepFaceSet::renderShape(const SoGLCoordinateElement * const vertexlist,
         trinr++;
         if (pi == trinr) {
             pi = piptr < piendptr ? *piptr++ : -1;
+            while (pi == 0) {
+                // It may happen that a part has no triangles
+                pi = piptr < piendptr ? *piptr++ : -1;
+                if (mbind == PER_PART)
+                    matnr++;
+                else if (mbind == PER_PART_INDEXED)
+                    matindices++;
+            }
             trinr = 0;
         }
     }