+ Bugfix: changed Plugin Loader to expect 'GetPluginVersion' instead of

'GetVersion'.
+ Introduced normal calculations. This is buggy due to multiple equal
  face normals distorting the vertex normal; this will be fixed by
  removing the redundant face normals from the calculations.

3d-viewer/3d_cache/sg/ifsg_faceset.cpp

@@ -159,3 +159,12 @@ bool IFSG_FACESET::NewNode( IFSG_NODE& aParent )
 
     return NewNode( np );
 }
+
+
+bool IFSG_FACESET::CalcNormals( void )
+{
+    if( m_node )
+        return ((SGFACESET*)m_node)->CalcNormals();
+
+    return false;
+}

3d-viewer/3d_cache/sg/sg_coordindex.cpp

@@ -41,3 +41,14 @@ SGCOORDINDEX::~SGCOORDINDEX()
 {
     return;
 }
+
+
+void SGCOORDINDEX::GatherCoordIndices( std::vector< int >& aIndexList )
+{
+    if( index.empty() )
+        return;
+
+    aIndexList.insert( aIndexList.end(), index.begin(), index.end() );
+
+    return;
+}

3d-viewer/3d_cache/sg/sg_coordindex.h

@@ -46,6 +46,13 @@ class SGCOORDINDEX : public SGINDEX
 public:
     SGCOORDINDEX( SGNODE* aParent );
     virtual ~SGCOORDINDEX();
+
+    /**
+     * Function GatherCoordIndices
+     * adds all coordinate indices to the given list
+     * in preparation for a normals calculation
+     */
+    void GatherCoordIndices( std::vector< int >& aIndexList );
 };
 
 #endif  // SG_COORDINDEX_H

3d-viewer/3d_cache/sg/sg_coords.cpp

@@ -24,6 +24,8 @@
 #include <iostream>
 #include "3d_cache/sg/sg_coords.h"
 #include "3d_cache/sg/sg_helpers.h"
+#include "3d_cache/sg/sg_normals.h"
+#include "3d_cache/sg/sg_faceset.h"
 
 
 SGCOORDS::SGCOORDS( SGNODE* aParent ) : SGNODE( aParent )
@@ -312,3 +314,37 @@ bool SGCOORDS::ReadCache( std::ifstream& aFile, SGNODE* parentNode )
 
     return true;
 }
+
+
+bool SGCOORDS::CalcNormals( void )
+{
+    if( NULL == m_Parent )
+        return false;
+
+    // the parent and all references must have indices; collect all
+    // indices into one std::vector<>
+    std::vector< int > ilist;
+    ((SGFACESET*)m_Parent)->GatherCoordIndices( ilist );
+
+    std::list< SGNODE* >::iterator sB = m_BackPointers.begin();
+    std::list< SGNODE* >::iterator eB = m_BackPointers.end();
+
+    while( sB != eB )
+    {
+        SGFACESET* fp = (SGFACESET*)(*sB);
+        fp->GatherCoordIndices( ilist );
+        ++sB;
+    }
+
+    SGNORMALS* np = ((SGFACESET*)m_Parent)->m_Normals;
+
+    if( !np )
+        np = new SGNORMALS( m_Parent );
+
+    if( S3D::CalcTriangleNormals( coords, ilist, np->norms )  )
+        return true;
+
+    delete np;
+
+    return false;
+}

3d-viewer/3d_cache/sg/sg_coords.h

@@ -55,6 +55,13 @@ public:
     void AddCoord( double aXValue, double aYValue, double aZValue );
     void AddCoord( const SGPOINT& aPoint );
 
+    /**
+     * Function CalcNormals
+     * calculates normals for this coordinate list and sets the
+     * normals list in the parent SGFACESET
+     */
+    bool CalcNormals( void );
+
     void ReNameNodes( void );
     bool WriteVRML( std::ofstream& aFile, bool aReuseFlag );
 

3d-viewer/3d_cache/sg/sg_faceset.cpp

@@ -1030,3 +1030,34 @@ bool SGFACESET::validate( void )
     valid = true;
     return true;
 }
+
+
+void SGFACESET::GatherCoordIndices( std::vector< int >& aIndexList )
+{
+    if( m_CoordIndices )
+        m_CoordIndices->GatherCoordIndices( aIndexList );
+
+    return;
+}
+
+
+bool SGFACESET::CalcNormals( void )
+{
+    if( m_RCoords )
+    {
+        SGFACESET* fp = (SGFACESET*) m_RCoords->GetParent();
+
+        if( !fp )
+            return false;
+
+        return fp->CalcNormals();
+    }
+
+    if( NULL == m_Coords || m_Coords->coords.empty() )
+        return false;
+
+    if( m_Normals && !m_Normals->norms.empty( ) )
+        return true;
+
+    return m_Coords->CalcNormals();
+}

3d-viewer/3d_cache/sg/sg_faceset.h

@@ -76,11 +76,20 @@ public:
     bool AddRefNode( SGNODE* aNode );
     bool AddChildNode( SGNODE* aNode );
 
+    bool CalcNormals( void );
+
     void ReNameNodes( void );
     bool WriteVRML( std::ofstream& aFile, bool aReuseFlag );
 
     bool WriteCache( std::ofstream& aFile, SGNODE* parentNode );
     bool ReadCache( std::ifstream& aFile, SGNODE* parentNode );
+
+    /**
+     * Function GatherCoordIndices
+     * adds all internal coordinate indices to the given list
+     * in preparation for a normals calculation
+     */
+    void GatherCoordIndices( std::vector< int >& aIndexList );
 };
 
 /*

3d-viewer/3d_cache/sg/sg_helpers.cpp

@@ -27,6 +27,8 @@
 #include <streambuf>
 #include <iomanip>
 #include <string>
+#include <utility>
+#include <map>
 
 #include "3d_cache/sg/sg_helpers.h"
 #include "3d_cache/sg/sg_node.h"
@@ -306,3 +308,192 @@ bool S3D::ReadColor( std::ifstream& aFile, SGCOLOR& aColor )
 
     return true;
 }
+
+
+struct TRIAD
+{
+    int p1;
+    int p2;
+    int p3;
+};
+
+
+bool S3D::CalcTriangleNormals( std::vector< SGPOINT > coords,
+    std::vector< int >& index, std::vector< SGVECTOR >& norms )
+{
+    size_t vsize = coords.size();
+
+    if( vsize < 3 )
+    {
+        #ifdef DEBUG
+        std::cerr << __FILE__ << ": " << __FUNCTION__ << ": " << __LINE__ << "\n";
+        std::cerr << " * [INFO] invalid vertex set (fewer than 3 vertices)\n";
+        #endif
+
+        return false;
+    }
+
+    size_t isize = index.size();
+
+    if( 0 != isize % 3 || index.empty() )
+    {
+        #ifdef DEBUG
+        std::cerr << __FILE__ << ": " << __FUNCTION__ << ": " << __LINE__ << "\n";
+        std::cerr << " * [INFO] invalid index set (not multiple of 3)\n";
+        #endif
+
+        return false;
+    }
+
+    if( !norms.empty() )
+    {
+        #ifdef DEBUG
+        std::cerr << __FILE__ << ": " << __FUNCTION__ << ": " << __LINE__ << "\n";
+        std::cerr << " * [INFO] normals set is not empty\n";
+        #endif
+
+        return false;
+    }
+
+    std::map< int, std::list< TRIAD > >vmap;
+
+    int p1, p2, p3;
+
+    // create the map of indices to facet sets
+    for( size_t i = 0; i < isize; )
+    {
+        p1 = index[i++];
+        p2 = index[i++];
+        p3 = index[i++];
+
+        if( p1 < 0 || p1 >= vsize || p2 < 0 || p2 >= vsize ||
+            p3 < 0 || p3 >= vsize )
+        {
+            #ifdef DEBUG
+            std::cerr << __FILE__ << ": " << __FUNCTION__ << ": " << __LINE__ << "\n";
+            std::cerr << " * [INFO] invalid index set; index out of bounds\n";
+            #endif
+
+            return false;
+        }
+
+        // ignore degenerate triangle indices; note that it is still possible to
+        // have degenerate vertices and these may cause problems
+        if( p1 == p2 || p2 == p3 || p3 == p1 )
+            continue;
+
+        TRIAD tri;
+        tri.p1 = p1;
+        tri.p2 = p2;
+        tri.p3 = p3;
+
+        std::map< int, std::list< TRIAD > >::iterator ip = vmap.find( p1 );
+
+        if( ip != vmap.end() )
+        {
+            ip->second.push_back( tri );
+        }
+        else
+        {
+            vmap.insert( std::pair < int, std::list < TRIAD > > ( p1, std::list < TRIAD >( 1, tri ) ) );
+        }
+
+        ip = vmap.find( p2 );
+
+        if( ip != vmap.end() )
+        {
+            ip->second.push_back( tri );
+        }
+        else
+        {
+            vmap.insert( std::pair < int, std::list < TRIAD > > ( p2, std::list < TRIAD >( 1, tri ) ) );
+        }
+
+        ip = vmap.find( p2 );
+
+        if( ip != vmap.end() )
+        {
+            ip->second.push_back( tri );
+        }
+        else
+        {
+            vmap.insert( std::pair < int, std::list < TRIAD > > ( p3, std::list < TRIAD >( 1, tri ) ) );
+        }
+    }
+
+    std::map< int, std::list< TRIAD > >::iterator sM = vmap.begin();
+    std::map< int, std::list< TRIAD > >::iterator eM = vmap.end();
+    size_t idx = 0;
+
+    while( sM != eM )
+    {
+        size_t item = sM->first;
+
+        // assign any skipped coordinates a normal of (0,0,1)
+        while( item > idx )
+        {
+            norms.push_back( SGVECTOR( 0, 0, 1 ) );
+            ++idx;
+        }
+
+        std::list< TRIAD >::iterator sT = sM->second.begin();
+        std::list< TRIAD >::iterator eT = sM->second.end();
+
+        double nx = 0.0;
+        double ny = 0.0;
+        double nz = 0.0;
+
+        // XXX - TODO:
+        // eliminate equal face normals in order to prevent distortion of the true vertex normal
+
+        while( sT != eT )
+        {
+            double x0, x1, x2;
+            double y0, y1, y2;
+            double z0, z1, z2;
+
+            x1 = coords[sT->p2].x - coords[sT->p1].x;
+            y1 = coords[sT->p2].y - coords[sT->p1].y;
+            z1 = coords[sT->p2].z - coords[sT->p1].z;
+
+            x2 = coords[sT->p3].x - coords[sT->p1].x;
+            y2 = coords[sT->p3].y - coords[sT->p1].y;
+            z2 = coords[sT->p3].z - coords[sT->p1].z;
+
+            x0 = (y1 * z2) - (z1 * y2);
+            y0 = (z1 * x2) - (x1 * z2);
+            z0 = (x1 * y2) - (y1 * x2);
+
+            double m = sqrt( x0*x0 + y0*y0 + z0*z0 );
+
+            // add the normal to the normal accumulated for this facet
+
+            if( m < 1e-12 )
+            {
+                nz += 1.0;
+            }
+            else
+            {
+                nx += ( x0 / m );
+                ny += ( y0 / m );
+                nz += ( z0 / m );
+            }
+
+            ++sT;
+        }
+
+        norms.push_back( SGVECTOR( nx, ny, nz ) );
+
+        ++idx;
+        ++sM;
+    }
+
+    if( norms.size() != coords.size() )
+    {
+        std::cerr << __FILE__ << ": " << __FUNCTION__ << ": " << __LINE__ << "\n";
+        std::cerr << " * [BUG] number of normals does not equal number of vertices\n";
+        return false;
+    }
+
+    return true;
+}

3d-viewer/3d_cache/sg/sg_helpers.h

@@ -35,9 +35,14 @@
 #include <fstream>
 #include <string>
 #include <algorithm>
+#include <vector>
 #include "plugins/3dapi/sg_base.h"
 #include "plugins/3dapi/sg_types.h"
 
+class SGNORMALS;
+class SGCOORDS;
+class SGCOORDINDEX;
+
 // Function to drop references within an SGNODE
 // The node being destroyed must remove itself from the object reference's
 // backpointer list in order to avoid a segfault.
@@ -148,6 +153,29 @@
 
 namespace S3D
 {
+    //
+    // Normals calculations from triangles
+    //
+
+    /*
+     * Function CalcTriangleNormals
+     * takes an array of 3D coordinates and its corresponding index set and calculates
+     * the normals assuming that indices are given in CCW order. Care must be taken in
+     * using this function to ensure that:
+     * (a) all coordinates are indexed; unindexed coordinates are assigned normal(0,0,1);
+     * when dealing with VRML models which may list and reuse one large coordinate set it
+     * is necessary to gather all index sets and perform this operation only once.
+     * (b) index sets must represent triangles (multiple of 3 indices) and must not be
+     * degenerate - that is all indices and coordinates in a triad must be unique.
+     *
+     * @param coords is the array of 3D vertices
+     * @param index is the array of 3x vertex indices (triads)
+     * @param norms is an empty array which holds the normals corresponding to each vector
+     * @return true on success; otherwise false.
+     */
+    bool CalcTriangleNormals( std::vector< SGPOINT > coords, std::vector< int >& index,
+        std::vector< SGVECTOR >& norms );
+
     //
     // VRML related functions
     //

3d-viewer/3d_cache/sg/sg_node.h

@@ -76,10 +76,10 @@ namespace S3D
 class SGNODE
 {
 private:
-    std::list< SGNODE* > m_BackPointers;    // nodes which hold a reference to this
     SGNODE** m_Association;                 // handle to the instance held by a wrapper
 
 protected:
+    std::list< SGNODE* > m_BackPointers;    // nodes which hold a reference to this
     SGNODE* m_Parent;       // pointer to parent node; may be NULL for top level transform
     S3D::SGTYPES m_SGtype;  // type of SG node
     std::string m_Name;     // name to use for referencing the entity by name

include/plugins/3dapi/ifsg_faceset.h

@@ -47,6 +47,8 @@ public:
     bool Attach( SGNODE* aNode );
     bool NewNode( SGNODE* aParent );
     bool NewNode( IFSG_NODE& aParent );
+
+    bool CalcNormals( void );
 };
 
 #endif  // IFSG_FACESET_H

plugins/3d/idf/s3d_plugin_idf.cpp

@@ -204,14 +204,13 @@ SCENEGRAPH* Load( char const* aFileName )
     IFSG_COORDINDEX* coordIdx = new IFSG_COORDINDEX( *face );
     coordIdx->SetIndices( indices.size(), &indices[0] );
 
-    // XXX - TO BE IMPLEMENTED : add correct normals and colors
-    std::vector< SGVECTOR > norms;
-
-    for( size_t i = 0; i < nvert; ++i )
-        norms.push_back( SGVECTOR( 0.0, 0.0, 1.0 ) );
-
-    IFSG_NORMALS* np = new IFSG_NORMALS( *face );
-    np->SetNormalList( nvert, &norms[0] );
+    if( !face->CalcNormals() )
+    {
+        #ifdef DEBUG
+        std::cerr << __FILE__ << ": " << __FUNCTION__ << ": " << __LINE__ << "\n";
+        std::cerr << " * [INFO] cannot calculate normals\n";
+        #endif
+    }
 
     // magenta
     IFSG_APPEARANCE* material = new IFSG_APPEARANCE( *shape);
@@ -222,13 +221,20 @@ SCENEGRAPH* Load( char const* aFileName )
 
     SCENEGRAPH* data = (SCENEGRAPH*)tx0->GetRawPtr();
 
+    // XXX - DEBUG - WRITE OUT IDF FILE TO CONFIRM NORMALS
+    wxFileName fn( aFileName );
+    wxString fnam = fn.GetName();
+    fnam.append( wxT(".wrl") );
+    std::cerr << "XXX: FILE NAME: " << fnam.ToUTF8() << "\n";
+    S3D::WriteVRML( fnam, true, (SGNODE*)(data), true, true );
+
+
     // delete the API wrappers
     delete shape;
     delete face;
     delete coordIdx;
     delete material;
     delete cp;
-    delete np;
     delete tx0;
 
     return data;

plugins/ldr/pluginldr.cpp

@@ -84,7 +84,7 @@ bool KICAD_PLUGIN_LDR::open( const wxString& aFullFileName, const char* aPluginC
     LINK_ITEM( m_getClassVersion, GET_CLASS_VERSION, "GetClassVersion" );
     LINK_ITEM( m_checkClassVersion, CHECK_CLASS_VERSION , "CheckClassVersion" );
     LINK_ITEM( m_getPluginName, GET_PLUGIN_NAME, "GetKicadPluginName" );
-    LINK_ITEM( m_getVersion, GET_VERSION, "GetVersion" );
+    LINK_ITEM( m_getVersion, GET_VERSION, "GetPluginVersion" );
 
     #ifdef DEBUG
         bool fail = false;