Use an independent pivot representation for the 3dmouse in the 3dviewer.

CHANGED: Instead of using the target style pivot that is used to move the
look at position, a different pivot is used for the center of rotation
used by the 3dmouse. Both pivots, the camera look at position and the
3dmouse rotation pivot, need not necessarily coincide. A blue ball is used
to represent the pivot.

3d-viewer/3d_canvas/eda_3d_canvas.cpp

@@ -521,6 +521,14 @@ void EDA_3D_CANVAS::DoRePaint()
         render_pivot( curtime_delta_s, scale );
     }
 
+#if defined( KICAD_USE_3DCONNEXION )
+    if( m_render3dmousePivot )
+    {
+        const float scale = glm::min( m_camera.GetZoom(), 1.0f );
+        render3dmousePivot( scale );
+    }
+#endif
+
     // "Swaps the double-buffer of this window, making the back-buffer the
     //  front-buffer and vice versa, so that the output of the previous OpenGL
     //  commands is displayed on the window."

3d-viewer/3d_canvas/eda_3d_canvas.h

@@ -178,6 +178,39 @@ public:
      */
     void SetRenderPivot( bool aValue ) { m_render_pivot = aValue; }
 
+
+#if defined( KICAD_USE_3DCONNEXION )
+    /**
+     * Get a value indicating whether to render the 3dmouse pivot.
+     */
+    bool GetRender3dmousePivot()
+    {
+        return m_render3dmousePivot;
+    }
+
+
+    /**
+     * Set aValue indicating whether to render the 3dmouse pivot.
+     *
+     * @param aValue true will cause the pivot to be rendered on the next redraw.
+     */
+    void SetRender3dmousePivot( bool aValue )
+    {
+        m_render3dmousePivot = aValue;
+    }
+
+
+    /**
+     *  Set the position of the the 3dmouse pivot.
+     *
+     *  @param aPos is the position of the 3dmouse rotation pivot
+     */
+    void Set3dmousePivotPos( const SFVEC3F& aPos )
+    {
+        m_3dmousePivotPos = aPos;
+    }
+#endif
+
 private:
     /**
      * Called by a wxPaintEvent event
@@ -245,6 +278,15 @@ private:
      */
     void render_pivot( float t, float aScale );
 
+#if defined( KICAD_USE_3DCONNEXION )
+    /**
+     * Render the 3dmouse pivot cursor.
+     *
+     * @param aScale scale to apply on the cursor.
+     */
+    void render3dmousePivot( float aScale );
+#endif
+
     /**
      * @return true if OpenGL initialization succeeded.
      */
@@ -289,6 +331,11 @@ private:
 
     BOARD_ITEM*            m_currentRollOverItem;
 
+#if defined( KICAD_USE_3DCONNEXION )
+    bool    m_render3dmousePivot = false; // Render the 3dmouse pivot
+    SFVEC3F m_3dmousePivotPos;            // The position of the 3dmouse pivot
+#endif
+
     /**
      *  Trace mask used to enable or disable the trace output of this class.
      *  The debug output can be turned on by setting the WXTRACE environment variable to

3d-viewer/3d_canvas/eda_3d_canvas_pivot.cpp

@@ -73,7 +73,7 @@ static void pivot_render_triangles( float t )
 }
 
 
-void EDA_3D_CANVAS::render_pivot( float t , float aScale )
+void EDA_3D_CANVAS::render_pivot( float t, float aScale )
 {
     wxASSERT( aScale >= 0.0f );
     wxASSERT( t >= 0.0f );
@@ -118,3 +118,46 @@ void EDA_3D_CANVAS::render_pivot( float t , float aScale )
     pivot_render_triangles( t  * 0.5f );
     glPopMatrix();
 }
+
+
+#if defined( KICAD_USE_3DCONNEXION )
+void EDA_3D_CANVAS::render3dmousePivot( float aScale )
+{
+    wxASSERT( aScale >= 0.0f );
+
+    glDisable( GL_LIGHTING );
+    glDisable( GL_DEPTH_TEST );
+    glDisable( GL_CULL_FACE );
+
+    // Set projection and modelview matrixes
+    glMatrixMode( GL_PROJECTION );
+    glLoadMatrixf( glm::value_ptr( m_camera.GetProjectionMatrix() ) );
+
+    glMatrixMode( GL_MODELVIEW );
+    glLoadIdentity();
+    glLoadMatrixf( glm::value_ptr( m_camera.GetViewMatrix() ) );
+
+    glEnable( GL_COLOR_MATERIAL );
+    glColor4f( 0.0f, 0.667f, 0.902f, 0.75f );
+
+    // Translate to the look at position
+    glTranslatef( m_3dmousePivotPos.x, m_3dmousePivotPos.y, m_3dmousePivotPos.z );
+
+    glPointSize( 16.0f );
+    glEnable( GL_POINT_SMOOTH );
+    glHint( GL_POINT_SMOOTH_HINT, GL_NICEST );
+
+    glEnable( GL_BLEND );
+    glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA );
+
+    glScalef( aScale, aScale, aScale );
+
+    // Draw a point at the look at position.
+    glBegin( GL_POINTS );
+    glVertex3f( 0, 0, 0 );
+    glEnd();
+
+    glDisable( GL_BLEND );
+    glDisable( GL_POINT_SMOOTH );
+}
+#endif

3d-viewer/3d_navlib/nl_3d_viewer_plugin_impl.cpp

@@ -459,16 +459,11 @@ long NL_3D_VIEWER_PLUGIN_IMPL::SetPivotPosition( const navlib::point_t& position
 {
     SFVEC3F pivotPos = SFVEC3F( position.x, position.y, position.z );
 
-    // Set the pivot icon position .
-    m_camera->SetLookAtPos_T1( pivotPos );
+    // Set the 3dmouse pivot position.
+    m_canvas->Set3dmousePivotPos( pivotPos );
 
-#if 0
-    // Set the trackball pivot to the same position as the 3DMouse pivot.
-    glm::mat4 m = m_camera->GetViewMatrix();
-    m_camera->SetLookAtPos( pivotPos );
-    m_camera->SetViewMatrix( std::move( m ) );
-    m_camera->Update();
-#endif
+    // Set the camera lookat pos.
+    m_camera->SetLookAtPos_T1( pivotPos );
 
     m_canvas->Request_refresh();
 
@@ -478,7 +473,7 @@ long NL_3D_VIEWER_PLUGIN_IMPL::SetPivotPosition( const navlib::point_t& position
 
 long NL_3D_VIEWER_PLUGIN_IMPL::GetPivotVisible( navlib::bool_t& visible ) const
 {
-    visible = m_canvas->GetRenderPivot();
+    visible = m_canvas->GetRender3dmousePivot();
 
     return 0;
 }
@@ -486,7 +481,7 @@ long NL_3D_VIEWER_PLUGIN_IMPL::GetPivotVisible( navlib::bool_t& visible ) const
 
 long NL_3D_VIEWER_PLUGIN_IMPL::SetPivotVisible( bool visible )
 {
-    m_canvas->SetRenderPivot( visible );
+    m_canvas->SetRender3dmousePivot( visible );
 
     m_canvas->Request_refresh();