How to visualize a value resulted from math node,or just to know it.
I tried the way of scaling this value to the scene size and then pick the color and get the value but I want more effective way to do this.


Question: Can I restrict a vhost to only a local IP?
Answer: Default Apache VirtualHost configuration has alias for /doc/ that redirects to Apache's documentation and access is restricted only to localhost. I think that is what you are looking for. Look at the Deny and Allow lines.

Alias /doc/ "/usr/share/doc/"
&lt;Directory "/usr/share/doc/"&gt;
    Options Indexes MultiViews FollowSymLinks
    AllowOverride None
    Order deny,allow
    Deny from all
    Allow from 127.0.0.0/255.0.0.0 ::1/128
&lt;/Directory&gt;