diff --git a/data/shaders/pbrFragment.glsl b/data/shaders/pbrFragment.glsl
index 4571734..5b2f1e8 100644
--- a/data/shaders/pbrFragment.glsl
+++ b/data/shaders/pbrFragment.glsl
@@ -122,6 +122,7 @@ void main()
    color = pow(color, vec3(1.0/2.2));
 
    //FragColor = texture(texture_diffuse1, ourTexCoord);
-   //FragColor = texture(texture_metalness1, ourTexCoord);
-   FragColor = texture(texture_diffuse1, ourTexCoord) * vec4(color, 0.0);
+   FragColor = texture(texture_metalness1, ourTexCoord);
+   //FragColor = texture(texture_diffuse1, ourTexCoord) * vec4(color, 0.0);
+   //FragColor = vec4(CameraPos,1.0);
 }
diff --git a/src/Error.cpp b/src/Error.cpp
index 789b296..5e142eb 100644
--- a/src/Error.cpp
+++ b/src/Error.cpp
@@ -1,18 +1,18 @@
 #include "Error.h"
 
 Error::Error(std::string location) { object = location; }
-void Error::crash(std::string msg) {
+const void Error::crash(std::string msg) const {
   log("Error: " + msg);
   throw std::string(object + ": \n" + msg);
 }
-void Error::crash(std::string reason, std::string msg) {
+const void Error::crash(std::string reason, std::string msg) const {
   log("Error: " + reason + ": \n" + msg);
   throw std::string(object + ": \n" + reason + ": \n" + msg);
 }
-void Error::warn(std::string msg) {
+const void Error::warn(std::string msg) const {
   log("Warining: " + msg);
   // throw object + ": " + msg;
 }
-void Error::log(std::string msg) {
+const void Error::log(std::string msg) const {
   std::cout << object << ": \n" << msg << std::endl;
 }
diff --git a/src/Error.h b/src/Error.h
index d5ec9d0..37fdfef 100644
--- a/src/Error.h
+++ b/src/Error.h
@@ -11,9 +11,9 @@ public:
   Error(std::string location);
 
   // TODO: make the crash break game loop
-  void crash(std::string msg);
-  void crash(std::string reason, std::string msg);
-  void warn(std::string msg);
+  const void crash(std::string msg) const;
+  const void crash(std::string reason, std::string msg) const;
+  const void warn(std::string msg) const;
   // TODO: write log issues to a file rather than throw
-  void log(std::string msg);
+  const void log(std::string msg) const;
 };
diff --git a/src/ShaderLoader.cpp b/src/ShaderLoader.cpp
index a8d89df..7f8935f 100644
--- a/src/ShaderLoader.cpp
+++ b/src/ShaderLoader.cpp
@@ -80,19 +80,37 @@ ShaderLoader::ShaderLoader(const char *vertexPath, const char *fragmentPath) {
 
 void ShaderLoader::use() { glUseProgram(ID); }
 void ShaderLoader::setBool(const std::string &name, bool value) const {
-  glUniform1i(glGetUniformLocation(ID, name.c_str()), (int)value);
+  int uniformLocation = glGetUniformLocation(ID, name.c_str());
+  glUniform1i(uniformLocation, (int)value);
+
+  if (uniformLocation == -1)
+    error.warn("Uniform location " + name + " not found");
 }
 void ShaderLoader::setInt(const std::string &name, int value) const {
-  glUniform1i(glGetUniformLocation(ID, name.c_str()), value);
+  int uniformLocation = glGetUniformLocation(ID, name.c_str());
+  glUniform1i(uniformLocation, value);
+
+  if (uniformLocation == -1)
+    error.warn("Uniform location " + name + " not found");
 }
 void ShaderLoader::setFloat(const std::string &name, float value) const {
-  glUniform1f(glGetUniformLocation(ID, name.c_str()), value);
+  int uniformLocation = glGetUniformLocation(ID, name.c_str());
+  glUniform1f(uniformLocation, value);
+
+  if (uniformLocation == -1)
+    error.warn("Uniform location " + name + " not found");
 }
 void ShaderLoader::setMat4(const std::string &name, glm::mat4 value) const {
-  glUniformMatrix4fv(glGetUniformLocation(ID, name.c_str()), 1, GL_FALSE,
-                     &value[0][0]);
+  int uniformLocation = glGetUniformLocation(ID, name.c_str());
+  glUniformMatrix4fv(uniformLocation, 1, GL_FALSE, &value[0][0]);
+
+  if (uniformLocation == -1)
+    error.warn("Uniform location " + name + " not found");
 }
 void ShaderLoader::setVec3(const std::string &name, glm::vec3 value) const {
-  glUniform3fv(glGetUniformLocation(ID, name.c_str()), 1,
-               glm::value_ptr(value));
+  int uniformLocation = glGetUniformLocation(ID, name.c_str());
+  glUniform3fv(uniformLocation, 1, glm::value_ptr(value));
+
+  if (uniformLocation == -1)
+    error.warn("Uniform location " + name + " not found");
 }
diff --git a/src/main.cpp b/src/main.cpp
index ed08ed8..1ccf33d 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -46,6 +46,10 @@ int main(int argc, char **argv) {
     return 1;
   }
 
+  // Set openGL version so RenderDoc works
+  SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
+  SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 2);
+
   // Create glContext
   SDL_GLContext glContext = SDL_GL_CreateContext(window);
   if (!glContext) {