I am just watching the Shaders intro video from here where the Youtube is saying  3 vertices make up a triangle and Could generate a couple hundred fragments based on how much of the screen that triangle occupies  Its super easy to understand the first thing but the next thing fragment? What actually the fragment is? When we join the three vertices the face will appear which is called a fragment? then how 3 vertices colud generate hundred of fragments?
What is a fragment in a fragment shader? Wikipedia says that:     In general, a fragment can be thought of as the data needed to shade the pixel, plus the data needed to test whether the fragment survives to become a pixel (depth, alpha, stencil, scissor, window ID, etc.)   So is it textures, vertices or something else?
How to enable or disable a user? I'm uing ubuntu 12.04 desktop. I have 3 users: user1(administrator), user2(standard) and guest. I wanted to disable user1 and enable user2 which auto logs on with no password but after I did that I can't login to user1 and user2 accounts except the guest session user. I'm striped off every administrative privileges. I don't know which options are available to me and how do I enable root or user which is an administrator? Which is correct: "one or more is" or "one or more are"? Should the phrase be "one or more is...", or "one or more are..."? Space faring human race encounters one highly advanced spaceship.  The one ship tells the human space fleet to go away and leave them alone. We don't listen and our ships are destroyed.  Human spy is sent to the alien world. Aliens look virtually identical to humans except they have no cartilage in their nose and the 'females' are only capable of mating every seven years. The human spy tells this story and is a brilliant tactician. He enters into a game tournament where they play a very complicated version of chess.  Human spy interacts with a higher ranking military officer who has a human female wife.  Human spy gets caught and when he is ultimately returned to Earth he advises humanity to unconditionally surrender to the alien race.  Humans eventually win because the alien males take human wives and their alien DNA is diluted in the vast human gene pool.  Looking for the title and author if anyone can recall them.  06/15 - update  I found the anthology. 'Second Game' was in 'The Arbor House Treasury of Great Science Fiction Short Novels' which came out in 1980 and 1981.  I did read the original story from 1958 which was actually a nominee for the Hugo Award for Novelette in 1959. When is the Laplace transform of a function continuous? Are there any general conditions on a function so that its Laplace transform is continuous? e.g. what conditions on $f:\mathbb {R} \rightarrow \mathbb {R}$ guarantee that its Laplace transform  $$F\left(s\right)=\int_{0}^{\infty}f\left(t\right)e^{-st}dt$$ is continuous? It seems to me that if $f$ has compact support and is bounded, then it ought to be. The idea I have is that we get  $$\left|F\left(s'\right)-F\left(s\right)\right|\leq\int_{0}^{y}\left|f\left(t\right)\right|\left|e^{-st}\right|dt$$ by making $s'$ and $s$ close enough, it seems we can make the RHS arbitrarily small. I haven't been able to complete a proof. Additionally, can we change the assumptions? Are there more natural assumptions to get continuity? I was having trouble playing the game on my android so I downloaded it to my wife's phone (Galaxy S6). I read some posts on how to get it running on my android and it worked but, my level 7 account is on my wife's phone.  How do I get it back to my android? When I sign out and back in it doesn't ask for any sign in info. I've tried deleting the app's data and even uninstalling and re-installing, but it still doesn't ask for sign-in info. What does an icon on the tag mean, for example the "rg" before the sql-server tag as pictured below? Using Pigeonhole Principle to prove two numbers in a subset of $[2n]$ divide each other Let $n$ be greater or equal to $1$, and let $S$ be an $(n+1)$-subset of $[2n]$. Prove that there exist two numbers in $S$ such that one divides the other.   Any help is appreciated! When there are too many linked questions to fit in the sidebar, it shows a link to &quot;see more linked questions...&quot;. Clicking on this link takes you to a front-page type showing only the linked questions. You can then use the tabs to sort by &quot;active&quot; to show the most recently active linked questions. However, the gray popup that appears when new questions are posted shows up for any recent activity, not just activity on the linked questions. Clicking through then updates the list, appending more questions to the top of the list, regardless of whether or not they're linked to the question at hand. To reproduce:  Go to  Wait for activity  Screenshots:   Now obviously this isn't a show-stopper, but I thought it might be worth mentioning.  Update June 2020 This is still relevant.  While sitting on the &quot;linked questions&quot; page for a specific question - in the above screenshot,  - and sorted by newest, when a new question is asked the &quot;1 question with new activity&quot; banner will show up, even if that new question does not link back to the question that you were on. How can I update all Snap packages? I know that I can update a snap package using  sudo snap refresh &lt;package&gt;   But is there a way to update all snaps, like   sudo apt dist-upgrade When looking at used camera bodies, a question that comes up a lot, is "how many shutter actuations, or clicks, does it have?"   What I am wondering is, how many is too many. In other words, is there a reference for knowing when a sensor is more likely to go? How should I judge a camera body with 20000 vs 5000? Is that a significant difference, or is that not even relevant.  Obviously this might something that is dependent on model, so if there is some information based on model that would be even more interesting.  One of the guys at Canon Tech Support said that this is completely irrelevant for the Rebel series cameras, but he is obviously slightly biased. :) How do I apply a patch file? Why does a lightsaber turn off when a Jedi dies or drops it? I rewatched the three newer movies and noticed that whenever a Jedi was killed, or let go of their lightsaber, it immediately turned off.  What was curious was that the lightsaber turns off right away, when a Jedi is killed, even before it leaves their hand (if it does fall out).  I could understand if the button needs to be held for it to stay on, but when a Jedi is shot and is still holding the lightsaber why would it turn off? "There Is"/"There are" depends on plurality of the first list element or not? I have a CSV file which has postcode data in a field, but it is non-spatial e.g. no Easting and Northing.   I have a shapefile with postcode in a field and some additional data.  I want to join the CSV with the shapefile based on attributes (postcode fields). I know I can do this in ArcMap, but how can I achieve the same thing in QGIS? I have a Google Apps email (me@business.com) set to auto-forward all mail to my personal Gmail (me@gmail.com).  I have added the me@business.com address to my personal Gmail so I can send mail as me@business.com from within my personal email account.  It's a fairly common way to consolidate email accounts.  Here's my problem.  I want me@gmail.com to filter all emails being forwarded from me@business.com and apply the Business label.  So I tried it two different ways:  A) Use an Alias:   me@business.com forward to me+business@gmail.com Create filter "To:me+business@gmail.com" in me@gmail account Have filter apply Business label   B) Use Googlemail.com address:   me@business.com forward to me@googlemail.com Create filter "To:me@googlemail.com" in me@gmail account Have filter apply Business label   However, neither of these filters work.  I've tested it using a third email address, me@yahoo.com.  Whenever I send an email from me@yahoo.com to me@business.com, the email is properly forwarded to me@gmail.com, and I can reply to me@yahoo.com using the me@business.com address.  But Gmail does NOT apply the Business label.  This is case using either filtering method A or B.  But if I send an email from me@yahoo.com DIRECTLY to me+business@gmail.com or me@googlemail.com, the filter works properly and applies the label.  So there must be something going on with the forwarding of me@business.com to me@gmail.com.  Does anyone know how to get this working? Splitting pieces of a mesh into a new object Given a message and DES encrypted form of said message, is it possible to efficiently compute the key used to encrypt the data? "Where somebody/something at" ? I'm not a native English speaker, so I would like to have an explanation of that expression: "Where something/somebody at?"  Examples :      Where Brooklyn at ? (interlude in a Lonely Island album)      Where you at ? (seen on a game server, instead of Where are you, I suppose)   Are not they supposed to say "Where is/are ..."? Exponent and abelian groups What exponent $e$ can guarantee the group to be abelian? Are there any known results except the case $e = 2$? Thanks for help. What desktop environments can group window icons in the taskbar like Windows 7? I find it much faster to identify a window in the taskbar (window list) by its icon,    rather than by its text:    The problem with most graphical interfaces I've  is that they don't group windows, and if you have more terminals or file managers, they'll just clutter the taskbar and you won't know which is which. Windows 7 offers a relatively elegant solution to this by grouping similar window icons together.  Question: What Linux  have this functionality? If addons exist that provide it, that's alright.  For reference, a Cinnamon applet that sort of does this is .