3D viewer: fix a minor issue, clean code and and a few comments.

Fixes https://gitlab.com/kicad/code/kicad/-/issues/21629

3d-viewer/3d_canvas/board_adapter.h

@@ -368,11 +368,12 @@ private:
     void createTrackWithMargin( const PCB_TRACK* aTrack, CONTAINER_2D_BASE* aDstContainer,
                                 PCB_LAYER_ID aLayer, int aMargin = 0 );
 
+    // Generate the pad shape on board layers. The pad hole is not generated by createPadWithMargin
     void createPadWithMargin( const PAD *aPad, CONTAINER_2D_BASE* aDstContainer,
                               PCB_LAYER_ID aLayer, const VECTOR2I& aMargin ) const;
 
-    void createPadWithHole( const PAD* aPad, CONTAINER_2D_BASE* aDstContainer,
-                                   int aInflateValue );
+    // Generate the hole shape of aPad, stored in aDstContainer
+    void createPadHoleShape( const PAD* aPad, CONTAINER_2D_BASE* aDstContainer, int aInflateValue );
 
     void addPads( const FOOTPRINT* aFootprint, CONTAINER_2D_BASE* aDstContainer,
                   PCB_LAYER_ID aLayerId );

3d-viewer/3d_canvas/create_3Dgraphic_brd_items.cpp

@@ -474,12 +474,12 @@ void BOARD_ADAPTER::createPadWithMargin( const PAD* aPad, CONTAINER_2D_BASE* aCo
 }
 
 
-void BOARD_ADAPTER::createPadWithHole( const PAD* aPad, CONTAINER_2D_BASE* aDstContainer,
-                                       int aInflateValue )
+void BOARD_ADAPTER::createPadHoleShape( const PAD* aPad, CONTAINER_2D_BASE* aDstContainer,
+                                        int aInflateValue )
 {
     if( !aPad->HasHole() )
     {
-        wxLogTrace( m_logTrace, wxT( "BOARD_ADAPTER::createPadWithHole - found an invalid pad" ) );
+        wxLogTrace( m_logTrace, wxT( "BOARD_ADAPTER::createPadHole pad has no hole" ) );
         return;
     }
 

3d-viewer/3d_canvas/create_layer_items.cpp

@@ -507,27 +507,32 @@ void BOARD_ADAPTER::createLayers( REPORTER* aStatusReporter )
     {
         for( PAD* pad : footprint->Pads() )
         {
-            const VECTOR2I padHole = pad->GetDrillSize();
-
-            if( !padHole.x )    // Not drilled pad like SMD pad
+            // Note: holes of NPTH are already built by GetBoardPolygonOutlines
+            if( !pad->HasHole() )
                 continue;
 
-            // The hole in the body is inflated by copper thickness, if not plated, no copper
-            int inflate = 0;
-
-            if( pad->GetAttribute() != PAD_ATTRIB::NPTH )
-                inflate = KiROUND( GetHolePlatingThickness() / 2.0 );
-
             m_holeCount++;
             double holeDiameter = ( pad->GetDrillSize().x + pad->GetDrillSize().y ) / 2.0;
             m_averageHoleDiameter += static_cast<float>( holeDiameter * m_biuTo3Dunits );
 
-            createPadWithHole( pad, &m_TH_ODs, inflate );
+            if( pad->GetAttribute() == PAD_ATTRIB::NPTH )
+            {
+                // Ensure the silk drawings are clipped to the NPTH hole, like other pad/via holes
+                // even if the clip to board body is not activated (remember NPTH holes are part of
+                // the board body)
+                createPadHoleShape( pad, &m_TH_ODs, 0 );
+                continue;
+            }
+
+            // The hole in the body is inflated by copper thickness
+            int inflate = KiROUND( GetHolePlatingThickness() / 2.0 );
+
+            createPadHoleShape( pad, &m_TH_ODs, inflate );
 
             if( cfg.clip_silk_on_via_annuli )
-                createPadWithHole( pad, &m_viaAnnuli, inflate );
+                createPadHoleShape( pad, &m_viaAnnuli, inflate );
 
-            createPadWithHole( pad, &m_TH_IDs, 0 );
+            createPadHoleShape( pad, &m_TH_IDs, 0 );
         }
     }
 
@@ -539,9 +544,7 @@ void BOARD_ADAPTER::createLayers( REPORTER* aStatusReporter )
     {
         for( PAD* pad : footprint->Pads() )
         {
-            const VECTOR2I padHole = pad->GetDrillSize();
-
-            if( !padHole.x ) // Not drilled pad like SMD pad
+            if( !pad->HasHole() )
                 continue;
 
             // The hole in the body is inflated by copper thickness.

3d-viewer/3d_rendering/opengl/create_scene.cpp

@@ -819,10 +819,7 @@ void RENDER_3D_OPENGL::generateViasAndPads()
             {
                 if( pad->GetAttribute() != PAD_ATTRIB::NPTH )
                 {
-                    const VECTOR2I drillsize = pad->GetDrillSize();
-                    const bool     hasHole = drillsize.x && drillsize.y;
-
-                    if( !hasHole )
+                    if( !pad->HasHole() )
                         continue;
 
                     pad->TransformHoleToPolygon( tht_outer_holes_poly, platingThickness,