From Patrick Neary, "In ShaderComposer::getOrCreateProgram(), tesselation control and evaluation shaders are processed but not added to the shader program."

src/osg/ShaderComposer.cpp

@@ -105,11 +105,21 @@ osg::Program* ShaderComposer::getOrCreateProgram(const ShaderComponents& shaderC
         addShaderToProgram(program.get(), vertexShaders);
     }
 
+     if (!tessControlShaders.empty())
+    {
+        addShaderToProgram(program.get(), tessControlShaders);
+    }
+
     if (!geometryShaders.empty())
     {
         addShaderToProgram(program.get(), geometryShaders);
     }
 
+     if (!tessEvaluationShaders.empty())
+    {
+        addShaderToProgram(program.get(), tessEvaluationShaders);
+    }
+
     if (!fragmentShaders.empty())
     {
         addShaderToProgram(program.get(), fragmentShaders);