From Luc Frauciel, "I've encoutered a nasty group of dae which are incompatible with dae plugins (and probably collada schema ) in 4 different ways :

1)  they use direct link to texture

-> this is already handle by current plugin : OK

2)  they defined colors with only 3 color components

->  it leads to a crash when trying to acces to the fourth component
 I fixed that

3)  they contain empty primitive lists

-> reading is ok, but osgviewer crashes when trying to display the geometries
The reason is that osg assume that  DrawElementsare never empty (blunt acces to DrawElements.front() in PrimitiveSet.cpp)
I corrected this (on the plugin side), but I wonder :
Is it the responsability of plugins to create non empty DrawElements, or of osg core not to crash when they occur ?
If the responsability is on the osg core side, I can submit a patch to PrimitiveSet.cpp regarding that aspect.

4)  they use a material binding scheme not supported by the plugin

->I've implemented a mechanism to handle this binding scheme

You will also find in the patch an example of these evil dae and comments on the offending elements.
They seems to be produced by ComputaMaps (www.computamaps.com)
They load well in Google Earth
"

src/osgPlugins/dae/daeRGeometry.cpp

@@ -462,7 +462,7 @@ void daeReader::processSinglePPrimitive(osg::Geode* geode,
     osg::Geometry *geometry = new osg::Geometry();
     if (NULL != group->getMaterial())
         geometry->setName(group->getMaterial());
-    geode->addDrawable( geometry );
+    
 
     osg::DrawElementsUInt* pDrawElements = new osg::DrawElementsUInt(mode);
     geometry->addPrimitiveSet(pDrawElements);
@@ -472,7 +472,11 @@ void daeReader::processSinglePPrimitive(osg::Geode* geode,
     std::vector<std::vector<GLuint> > indexLists;
     resolveMeshArrays(domPArray, group->getInput_array(), pDomMesh,
         geometry, sources, indexLists);
-    pDrawElements->asVector().swap(indexLists.front());
+    if (indexLists.front().size()) 
+    {
+        pDrawElements->asVector().swap(indexLists.front());
+        geode->addDrawable( geometry );
+    }
 }
 
 template< typename T >
@@ -945,6 +949,9 @@ void daeReader::resolveMeshArrays(const domP_Array& domPArray,
     {
         if (daeElement* texcoord_source = texcoord_sources[texcoord_set])
         {
+            std::string id = std::string("#") + texcoord_source->getID();
+            //We keep somewhere the mapping between daeElement id and created arrays
+            _texCoordIdMap.insert(std::pair<std::string,size_t>(id,texcoord_set));
             // 2D Texcoords
             osg::Geometry::ArrayData arrayData( createGeometryData<osg::Vec2Array, osg::Vec2dArray, VertexIndices::TEXCOORD>(sources[texcoord_source], vertexIndicesIndexMap, readDoubleTexcoords, texcoord_set) );
             if (arrayData.array.valid())

src/osgPlugins/dae/daeRMaterials.cpp

@@ -584,7 +584,7 @@ bool daeReader::processColorOrTextureType(const osg::StateSet* ss,
         if (cot->getColor() != NULL )
         {
             domFloat4 &f4 = cot->getColor()->getValue();
-            mat->setEmission( osg::Material::FRONT_AND_BACK, osg::Vec4( f4[0], f4[1], f4[2], f4[3] ) );
+            mat->setEmission( osg::Material::FRONT_AND_BACK, osg::Vec4( f4[0], f4[1], f4[2], (f4.getCount()==4)? f4[3] : 1.0 ) );
             retVal = true;
         }
         else if (cot->getParam() != NULL)
@@ -616,7 +616,7 @@ bool daeReader::processColorOrTextureType(const osg::StateSet* ss,
         if (cot->getColor() != NULL )
         {
             domFloat4 &f4 = cot->getColor()->getValue();
-            mat->setAmbient( osg::Material::FRONT_AND_BACK, osg::Vec4( f4[0], f4[1], f4[2], f4[3] ) );
+            mat->setAmbient( osg::Material::FRONT_AND_BACK, osg::Vec4( f4[0], f4[1], f4[2], (f4.getCount()==4)? f4[3] : 1.0 ) );
             retVal = true;
         }
         else if (cot->getParam() != NULL)
@@ -646,10 +646,10 @@ bool daeReader::processColorOrTextureType(const osg::StateSet* ss,
     }
     else if (channel == osg::Material::DIFFUSE )
     {
-        if (cot->getColor() != NULL )
+        if (cot->getColor() != NULL)
         {
             domFloat4 &f4 = cot->getColor()->getValue();
-            mat->setDiffuse( osg::Material::FRONT_AND_BACK, osg::Vec4( f4[0], f4[1], f4[2], f4[3] ) );
+            mat->setDiffuse( osg::Material::FRONT_AND_BACK, osg::Vec4( f4[0], f4[1], f4[2], (f4.getCount()==4)? f4[3] : 1.0 ) );
             retVal = true;
         }
         else if (cot->getTexture() != NULL)
@@ -700,7 +700,7 @@ bool daeReader::processColorOrTextureType(const osg::StateSet* ss,
         if (cot->getColor() != NULL )
         {
             domFloat4 &f4 = cot->getColor()->getValue();
-            mat->setSpecular( osg::Material::FRONT_AND_BACK, osg::Vec4( f4[0], f4[1], f4[2], f4[3] ) );
+            mat->setSpecular( osg::Material::FRONT_AND_BACK, osg::Vec4( f4[0], f4[1], f4[2], (f4.getCount()==4)? f4[3] : 1.0 ) );
             retVal = true;
         }
         else if (cot->getParam() != NULL)
@@ -1305,9 +1305,31 @@ bool daeReader::copyTextureCoordinateSet(const osg::StateSet* ss, const osg::Geo
     if (k == bvia.getCount())
     {
         OSG_WARN << "Failed to find matching <bind_vertex_input> for " << texCoordSetName << std::endl;
-        if (cachedGeometry->getNumTexCoordArrays())
+
+        //bind_vertex_input failed, we try bind
+        const domInstance_material::domBind_Array &ba = im->getBind_array();
+        for (k = 0; k < ba.getCount(); k++)
         {
-        clonedGeometry->setTexCoordData(localTextureUnit, cachedGeometry->getTexCoordData(0));
+            if (!strcmp(ba[k]->getSemantic(), texCoordSetName.c_str()) )
+            {
+                IdToCoordIndexMap::const_iterator it = _texCoordIdMap.find(ba[k]->getTarget());
+                if (it!=_texCoordIdMap.end()&& (cachedGeometry->getNumTexCoordArrays()>it->second))
+                {
+                  clonedGeometry->setTexCoordData(localTextureUnit, cachedGeometry->getTexCoordData(it->second));
+                }
+                else
+                {
+                    OSG_WARN << "Texture coordinate set " << ba[k]->getTarget() << " not found." << std::endl;
+                }
+                break;
+            }
+        }
+        if (k == ba.getCount())
+        {
+            if (cachedGeometry->getNumTexCoordArrays())
+            {
+                clonedGeometry->setTexCoordData(localTextureUnit, cachedGeometry->getTexCoordData(0));
+            }
         }
     }
     return true;

src/osgPlugins/dae/daeReader.h

@@ -245,6 +245,7 @@ public:
     typedef std::map<domNode*, osg::ref_ptr<osgAnimation::Skeleton> > domNodeOsgSkeletonMap;
     typedef std::map<TextureParameters, osg::ref_ptr<osg::Texture2D> > TextureParametersMap;
     typedef std::map<std::pair<const osg::StateSet*, TextureUnitUsage>, std::string> TextureToCoordSetMap;
+    typedef std::map<std::string, size_t> IdToCoordIndexMap;
 
     typedef std::map< daeElement*, domSourceReader > SourceMap;
     typedef std::map< int, osg::IntArray*, std::less<int> > IndexMap;
@@ -403,6 +404,7 @@ private:
     MaterialStateSetMap _materialMap2;
     TextureParametersMap _textureParamMap;
     TextureToCoordSetMap _texCoordSetMap;
+    IdToCoordIndexMap    _texCoordIdMap;
     domInstance_controllerList _skinInstanceControllers;
     OldToNewIndexMap _oldToNewIndexMap;