From Wojciech Lewandowski, "1: fix for a issue with MinimalShadowMap and LightSpacePerspectiveShadowMapVB techniques ignoring minLightMargin parameter.

2: minor tweak for a DebugHUD drawn improperly case when multiple slave views  shared one window. It now uses slave view viewport to correctly position DebugHUD.
3: deactivated ConvexPolyhedron notifications (they were accidentaly activated when you replaced osg::notify calls with OSG_NOTIFY macro). These warnings are useful only for shadow map developer working on shadow volume optimizations. So there is no sense in having them active all the time."

include/osgShadow/MinimalShadowMap

@@ -102,6 +102,7 @@ class OSGSHADOW_EXPORT MinimalShadowMap : public StandardShadowMap
             osg::Matrix                      *_modellingSpaceToWorldPtr;
             float                            *_maxFarPlanePtr;
             float                            *_minLightMarginPtr;
+            int                               _frameShadowCastingCameraPasses;
 
             ConvexPolyhedron                 _sceneReceivingShadowPolytope;
             std::vector< osg::Vec3d >        _sceneReceivingShadowPolytopePoints;

include/osgShadow/ProjectionShadowMap

@@ -64,10 +64,13 @@ class OSGSHADOW_EXPORT ProjectionShadowMap : public MinimalBoundsBaseClass
 
             virtual void frameShadowCastingCamera
                 ( const osg::Camera* cameraMain, osg::Camera* cameraShadow, int pass = 1 )
+            {
+                if( pass == BaseClass::ViewData::_frameShadowCastingCameraPasses - 1 )
                 {
                     // Force dependent name lookup
                     ShadowProjectionAlgorithmClass::operator()
                         ( &this->_sceneReceivingShadowPolytope, cameraMain, cameraShadow );
+                }
 
                 // DebugBoundingBox( computeScenePolytopeBounds(), "ProjectionShadowMap" );
                 BaseClass::ViewData::frameShadowCastingCamera( cameraMain, cameraShadow, pass );

src/osgShadow/ConvexPolyhedron.cpp

@@ -31,7 +31,16 @@ using namespace osgShadow;
 
 
 #if defined( DEBUG ) || defined( _DEBUG ) || defined( _DEBUG_ )
-    #define MAKE_CHECKS 1
+// ConvexPolyhedron may produce tons of warnings when it becomes non convex.
+// Unfortuantely this condition often happens in daily routine of shadow usage 
+// due precision errors mixed with repeating frustum cuts performed by MinimalShadowClasses.
+// However, in most of above cases this condition is not fatal
+// because polyhedron becomes concave by very small margin (mesuring deep the hole).
+// Unfortunately warnings are produced even for such small margin cases and can 
+// easily flood the console.
+// So I leave MAKE_CHECKS commented out. Its really useful only for a guy who debugs 
+// larger concaveness issues which means most developers will want to keep it commented.
+//    #define MAKE_CHECKS 1
 #endif
 
 #if MAKE_CHECKS

src/osgShadow/DebugShadowMap.cpp

@@ -391,8 +391,25 @@ void DebugShadowMap::ViewData::init( ThisClass *st, osgUtil::CullVisitor *cv )
 
     _hudSize                  = st->_hudSize;
     _hudOrigin                = st->_hudOrigin;
-    _viewportSize             = st->_viewportSize;
+
     _viewportOrigin           = st->_viewportOrigin;
+    _viewportSize             = st->_viewportSize;
+
+    osg::Viewport * vp = cv->getViewport();
+    if( vp )
+    {
+        // view can be a slave that covers only a fraction of the screen
+        // so adjust debug hud location to proper viewport location 
+        _viewportOrigin[0] += vp->x();
+        _viewportOrigin[1] += vp->y();
+
+        if( _viewportSize[0] > vp->width() - _viewportOrigin[0] )
+            _viewportSize[0] = vp->width() - _viewportOrigin[0];
+
+        if( _viewportSize[1] > vp->height() - _viewportOrigin[1] )
+            _viewportSize[1] = vp->height() - _viewportOrigin[1];
+    }
+
     _orthoSize                = st->_orthoSize;
     _orthoOrigin              = st->_orthoOrigin;
     

src/osgShadow/MinimalCullBoundsShadowMap.cpp

@@ -41,6 +41,7 @@ void MinimalCullBoundsShadowMap::ViewData::init
     ( ThisClass *st, osgUtil::CullVisitor *cv )
 {
     BaseClass::ViewData::init( st, cv );
+    _frameShadowCastingCameraPasses = 2;
 }
 
 void MinimalCullBoundsShadowMap::ViewData::aimShadowCastingCamera

src/osgShadow/MinimalDrawBoundsShadowMap.cpp

@@ -271,6 +271,7 @@ void MinimalDrawBoundsShadowMap::ViewData::init
 {
     BaseClass::ViewData::init( st, cv );
     
+    _frameShadowCastingCameraPasses = 2;
     _camera->setCullCallback
         ( new CameraCullCallback( this, _camera->getCullCallback() ) );
     

src/osgShadow/MinimalShadowMap.cpp

@@ -168,7 +168,7 @@ void MinimalShadowMap::ViewData::aimShadowCastingCamera
     osg::Matrix mvp = _camera->getViewMatrix() * _camera->getProjectionMatrix();
     cutScenePolytope( osg::Matrix::inverse( mvp ),  mvp );
 
-    MinimalShadowMap::ViewData::frameShadowCastingCamera
+    frameShadowCastingCamera
             ( _cv->getRenderStage()->getCamera(), _camera.get(), 0 );
 }
 
@@ -207,7 +207,7 @@ void MinimalShadowMap::ViewData::frameShadowCastingCamera
         // space (-1..1), it may get "twisted" by precisely adjusted shadow cam 
         // projection in second pass. 
 
-        if ( pass == 0 ) 
+        if ( pass == 0 && _frameShadowCastingCameraPasses > 1 )
         { // Make sure extruded polytope does not extend beyond light frustum
             osg::Polytope lightFrustum;
             lightFrustum.setToUnitFrustum();
@@ -304,6 +304,8 @@ void MinimalShadowMap::ViewData::init( ThisClass *st, osgUtil::CullVisitor *cv )
     _modellingSpaceToWorldPtr = &st->_modellingSpaceToWorld;
     _minLightMarginPtr        = &st->_minLightMargin;
     _maxFarPlanePtr           = &st->_maxFarPlane;
+
+    _frameShadowCastingCameraPasses = 1;
 }
 
 void MinimalShadowMap::ViewData::cutScenePolytope