diff --git a/3d-viewer/3d_rendering/3d_render_raytracing/c3d_render_createscene.cpp b/3d-viewer/3d_rendering/3d_render_raytracing/c3d_render_createscene.cpp
index e37bb10410..2910ccdf7e 100644
--- a/3d-viewer/3d_rendering/3d_render_raytracing/c3d_render_createscene.cpp
+++ b/3d-viewer/3d_rendering/3d_render_raytracing/c3d_render_createscene.cpp
@@ -918,7 +918,6 @@ void C3D_RENDER_RAYTRACING::reload( REPORTER *aStatusTextReporter )
     }
     m_accelerator = 0;
 
-    //m_accelerator = new CGRID( m_object_container );
     m_accelerator = new CBVH_PBRT( m_object_container );
 
 #ifdef PRINT_STATISTICS_3D_VIEWER
diff --git a/3d-viewer/3d_rendering/3d_render_raytracing/ray.cpp b/3d-viewer/3d_rendering/3d_render_raytracing/ray.cpp
index c475d93d77..a4826d69a7 100644
--- a/3d-viewer/3d_rendering/3d_render_raytracing/ray.cpp
+++ b/3d-viewer/3d_rendering/3d_render_raytracing/ray.cpp
@@ -50,9 +50,9 @@ void RAY::Init( const SFVEC3F& o, const SFVEC3F& d )
     // Amy Williams Steve Barrus R. Keith Morley Peter Shirley
     // University of Utah
     // http://people.csail.mit.edu/amy/papers/box-jgt.pdf
-    m_dirIsNeg[0] = m_Dir.x <= 0.0f;
-    m_dirIsNeg[1] = m_Dir.y <= 0.0f;
-    m_dirIsNeg[2] = m_Dir.z <= 0.0f;
+    m_dirIsNeg[0] = m_Dir.x < 0.0f;
+    m_dirIsNeg[1] = m_Dir.y < 0.0f;
+    m_dirIsNeg[2] = m_Dir.z < 0.0f;
 
 
     // ray slope
diff --git a/3d-viewer/3d_rendering/3d_render_raytracing/shapes3D/cbbox.cpp b/3d-viewer/3d_rendering/3d_render_raytracing/shapes3D/cbbox.cpp
index aef633dd4d..72d007e621 100644
--- a/3d-viewer/3d_rendering/3d_render_raytracing/shapes3D/cbbox.cpp
+++ b/3d-viewer/3d_rendering/3d_render_raytracing/shapes3D/cbbox.cpp
@@ -271,7 +271,7 @@ SFVEC3F CBBOX::Offset( const SFVEC3F &p ) const
 // https://github.com/mmp/pbrt-v2/blob/master/src/core/geometry.cpp#L68
 // /////////////////////////////////////////////////////////////////////////
 #if 0
-bool CBBOX::Intersect( const RAY &aRay, float *aOutHitt0, float *aOutHitt1 )
+bool CBBOX::Intersect( const RAY &aRay, float *aOutHitt0, float *aOutHitt1 ) const
 {
     float t0 = 0.0f;
     float t1 = FLT_MAX;