Shader cleanup

core/assets/shaders/planetgrid.frag

@@ -0,0 +1,14 @@
+#ifdef GL_ES
+precision mediump float;
+#endif
+
+varying vec4 v_col;
+varying vec4 v_position;
+
+uniform vec3 u_mouse;
+
+const vec4 shadow = vec4(0, 0, 0, 0);
+
+void main(){
+    gl_FragColor = mix(v_col, shadow, distance(u_mouse, v_position.xyz));
+}