diff --git a/src/core/src/mesh.cpp b/src/core/src/mesh.cpp
index 137e71f..02b81a4 100644
--- a/src/core/src/mesh.cpp
+++ b/src/core/src/mesh.cpp
@@ -60,9 +60,6 @@ void geometry::set_vertices(const geometry::vertex3array_t &v)
     // first set vertices
     _vertices = v;
 
-    //
-    compute_normals();
-
     // update bounds
     compute_bounds();
 }
diff --git a/src/visual/src/pipeline.cpp b/src/visual/src/pipeline.cpp
index c8ee0e5..487c1ef 100644
--- a/src/visual/src/pipeline.cpp
+++ b/src/visual/src/pipeline.cpp
@@ -145,6 +145,7 @@ struct triangle_renderer
 		matrix4x4f view_mat = matrix_transform<float>::look_at(vector3({0,0,0}),
 															   vector3::forward(),
 															   vector3::up());
+
 		// materials should carry this
 #if 1
 		glEnable(GL_CULL_FACE);
@@ -155,7 +156,6 @@ struct triangle_renderer
 
 		// now bind textures
 
-
 #if 1
 		auto proj_mat = matrix_transform<float>::orthographic_projection(1.3,1.0,
 																		 0.2f,100.f);
@@ -189,6 +189,11 @@ struct triangle_renderer
 
 		amesh_renderer.draw();
 
+        auto error = glGetError();
+        if (error != GL_NO_ERROR){
+            debug::e() << "GL error " << error;
+        }
+
 		//		debug::d() << 100 * (timer::now() - t0) << "ms";
 	}
 };
@@ -290,8 +295,8 @@ void pipeline::impl::draw()
 
 	glBindFramebuffer(GL_DRAW_FRAMEBUFFER, _fbo_msaa);
 
-	//	glClearColor(0,0,0,1);
-	//	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+//        glClearColor(1.0,0,0,1);
+//        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 
 	//	glViewport(0,0,800,600);
 
diff --git a/src/visual/src/vertex_array.cpp b/src/visual/src/vertex_array.cpp
index 24afb19..b08c94a 100644
--- a/src/visual/src/vertex_array.cpp
+++ b/src/visual/src/vertex_array.cpp
@@ -2,11 +2,13 @@
 
 #include "pw/core/mesh.hpp"
 #include "pw/core/size.hpp"
+#include "pw/core/debug.hpp"
 
 #include "glad/glad.h"
 
 #include <algorithm>
 
+
 namespace pw {
 
 struct vertex_array::impl {
@@ -34,7 +36,7 @@ struct vertex_array::impl {
 
 	void create(const geometry& m)
 	{
-		// not sure ...
+        // reset if the renderer already in use
 		if (ready()) {
 			release();
 		}
@@ -77,6 +79,14 @@ struct vertex_array::impl {
 		// stop binding
 		glBindVertexArray(0);
 
+        auto error = glGetError();
+        if (error != GL_NO_ERROR) {
+            debug::e() << "GL error: " << error;
+        }
+
+        debug::d() << "Vertices: " << m.vertices().size();
+        debug::d() << "Indices   " << m.indices().size();
+
 	}
 
 
@@ -95,6 +105,11 @@ struct vertex_array::impl {
 		glDrawElements(GL_TRIANGLES, _mesh_elements, GL_UNSIGNED_INT, nullptr);
 		glBindVertexArray(0);
 
+        auto error = glGetError();
+        if (error != GL_NO_ERROR) {
+            debug::e() << "GL error: " << error;
+        }
+
     }
 
 //	GLint get_mode(vertex_array::)