adjust vertex shaded to pass information to fragment shaded for light

QtMeshViewer/Resources/vshader.glsl

@@ -13,13 +13,17 @@ attribute vec2 a_texcoord;
 attribute vec3 a_normal;
 
 varying vec2 v_texcoord;
+varying vec4 v_position;
+varying vec3 v_normal;
 
 void main()
 {
 	// Calculate vertex position in screen space
 	gl_Position = vp_matrix * norm_matrix * m_matrix * a_position;
 
-	// Pass texture coordinate to fragment shader
+	// Pass data to fragment shader
 	// Value will be automatically interpolated to fragments inside polygon faces
 	v_texcoord = a_texcoord;
+	v_position = a_position;
+	v_normal = a_normal;
 }