diff --git a/res/shaders/simple.frag b/res/shaders/simple.frag
index 421d5c3..3be140a 100644
--- a/res/shaders/simple.frag
+++ b/res/shaders/simple.frag
@@ -16,7 +16,31 @@ float dither(vec2 uv) {
     return (rand(uv) * 2.0 - 1.0) / 256.0;
 }
 
+const vec3 objectColor = vec3(1.0, 1.0, 1.0);
+const vec3 lightColor = vec3(1.0, 1.0, 1.0);
+const float ambientStrength = 0.1;
+const float specularStrength = 0.5;
+const float shininess = 32.0;
+
 void main()
 {
-    color = vec4(0.5 * normal + 0.5, 1.0);
+    vec3 norm = normalize(normal);
+    vec3 viewDir = normalize(cameraPosition - worldPositions);
+
+    vec3 ambient = ambientStrength * lightColor * objectColor;
+    vec3 result = ambient;
+
+    for (int i = 0; i < 3; i++) {
+        vec3 lightDir = normalize(lightPositions[i] - worldPositions);
+        float diff = max(dot(norm, lightDir), 0.0);
+        vec3 diffuse = diff * lightColor;
+
+        vec3 halfwayDir = normalize(lightDir + viewDir);
+        float spec = pow(max(dot(norm, halfwayDir), 0.0), shininess);
+        vec3 specular = specularStrength * spec * lightColor;
+
+        result += (diffuse + specular) * objectColor;
+    }
+
+    color = vec4(result, 1.0);
 }
diff --git a/src/gamelogic.cpp b/src/gamelogic.cpp
index f6f0b98..9f14dac 100644
--- a/src/gamelogic.cpp
+++ b/src/gamelogic.cpp
@@ -407,7 +407,7 @@ void updateNodeTransformations(SceneNode* node, glm::mat4 transformationThusFar)
 void renderNode(SceneNode* node) {
     glUniformMatrix4fv(3, 1, GL_FALSE, glm::value_ptr(node->currentTransformationMatrix));
     glUniformMatrix4fv(4, 1, GL_FALSE, glm::value_ptr(node->modelMatrix));
-    glUniformMatrix4fv(5, 1, GL_FALSE, glm::value_ptr(node->normalMatrix));
+    glUniformMatrix3fv(5, 1, GL_FALSE, glm::value_ptr(node->normalMatrix));
 
     GLint lightPosLoc = shader->getUniformFromName("lightPositions");
     glUniform3fv(lightPosLoc, 3, glm::value_ptr(lightCoords[0]));