one planet is always the sun and rendering the sun dynamically now.

data/shader/gameobjects.frag

@@ -1,20 +1,26 @@
 #version 120
 
-varying vec3 vertex;
-varying vec3 normal;
+varying vec3  vertex;
+varying vec3  normal;
+varying vec3  lightDirection;
 
-uniform vec3 materialColor;
-uniform vec3 lightColor;
-uniform vec3 lightPosition;
-
-varying vec3 lightDirection;
+uniform vec3  lightColor;
+uniform vec3  lightPosition;
+uniform float materialKind;
+uniform vec3  materialColor;
 
 void main()
 {
   vec3 Eye       = normalize(-vertex);
   vec3 Reflected = normalize(reflect( -lightPosition, normal));
 
-  vec3 IAmbient  = vec3(0.2f);
+  vec3 IAmbient  = vec3(0.05f);
+
+  if (materialKind == 6) {
+      // sun: shines by itself
+      gl_FragColor = vec4(materialColor, 1.0);
+      return;
+  }
 
     // TODO: add noise texture
   vec3 IDiffuse  = vec3(materialColor) * lightColor * max(dot(normal, lightDirection), 0.0);