update light direction

src/modules/Archimedes-Modules/Rubiks/Rubiks.h

@@ -63,7 +63,7 @@ class Rubiks : public Archimedes::Module {
             "   vec3 light = vec3(1.0f, 1.0f, 1.0f);\n"
             "   vec3 amblight = 0.1f * light;\n"
             "   vec3 norm = normalize(Norm);\n"
-            "   vec3 lightdir = normalize(vec3(-10, 20, 20) - FragPos);\n"
+            "   vec3 lightdir = normalize(vec3(10, 20, 20) - FragPos);\n"
             "   vec3 diff = max(dot(norm, lightdir), 0.0) * light;\n"
             "   FragColor = vec4((amblight + diff) * col.rgb, 1.0f);\n"
             "}\n\0";