I have a baked particle system that uses the Molecular Physics addon, and I'd like to convert the particles into keyframed objects... Is there any way I can achieve that? I know it's possible with rigid bodies, and others etc, but I haven't seen anyone do it with particles before (it might be a several step process). Any and all help is appreciated!
I've started trying to make a 3D model that I will end up exporting to an augmented reality app but I've hit a problem in terms of the particle system. The app wants the 3D file in .dae(collada) format which blender allows, but it doesn't seem to export particle systems. I've read that blender doesn't support exporting particle systems at all so I'm now focused on converting the particle system to lots of meshes which will (hopefully)animate using key frames. Then I can export all the meshes and the particles will 'work'.  Currently I'm just using a standard particle system emitting small icospheres. I've tried a few different techniques, such as 'make duplicates real' and using a particle instance instead but they don't seem to animate. Instead it just freezes the current frame into an object(which exports fine but is not what I want). I've also tried recording the animation in the blender game engine but particle systems don't work with it so that didn't work either.  Any help would be appreciated! Thanks
Prove that $2xy\mid x^2+y^2-x$ implies $x$ is a perfect square. Prove that $2xy\mid x^2+y^2-x$ implies $x$ is a perfect square. My work: $2xy\mid x^2+y^2-x \implies x^2+y^2-x=2xy\cdot k$ So,$x^2+y^2+2xy-x=(x+y)^2-x=2xy \cdot (k+1)$ And,$x^2+y^2-2xy-x=(x-y)^2-x=2xy \cdot (k-1)$ I found that for $x,y$ both odd, no solution exists. For $x$ even, and $y$ odd,no solution exists. Solution exists only for $x$ odd, $y$ even and $x$ even and $y$ even solution exists. Cannot do anything more. Please help! Preventing Brute Force Logins on Websites As a response to the recent  and , what is the best way to secure your website against brute force login attacks?  Jeff's post suggests putting in an increasing delay for each attempted login, and a suggestion in the comments is to add a captcha after the 2nd failed attempt.  Both these seem like good ideas, but how do you know what "attempt number" it is?  You can't rely on a session ID (because an attacker could change it each time) or an IP address (better, but vulnerable to botnets).  Simply logging it against the username could, using the delay method, lock out a legitimate user (or at least make the login process very slow for them).  Thoughts? Suggestions? How to prove that a limit does not exist? Let $x \in \mathbb{R}$ and let $\lfloor y\rfloor$ be the largest integer less than or equal to $x$. $$ f(x) = \frac{1}{x} - \left\lfloor\frac{1}{x}\right\rfloor$$ How does one prove that the $ \lim_{x\to 0} f(x)$ does not exist by using a Epsilon Delta proof? There is a hint given that you can use a proof by contradiction. Antonym of "phobia" If a phobia is to have an irrational fear of something, what is the word for having an irrational affinity for something?  For example a numerologist may fear the number 13, but be attracted to (or even have a love for) the number 8. (Some would say this is irrational.) Classical car collision I have a very confusing discussion with a friend of mine.  2 cars ($car_a$ and $car_b$) of the same mass $m$ are on a collision course. Both cars travel at $50_\frac{km}{h}$ towards each other.  They collide. Ignoring any shreds and collateral damage, what is the speed of collision that the driver of $car_a$ felt?  What I mean is, if $car_a$ were to be driven into an infinite mass wall, what would the velocity be to replicate the damage caused by the initial collision? What are Squirrel Girl's 'actual' stats? Is she truly the most powerful being in the Marvel universe? On the  ("The Definitive online source for Marvel super hero bios") Squirrel Girl is listed as having the maximum stats in her .  However in the  ("Comprehensive and exhaustive") she's listed as having lower stats.     Which one is correct and why is there a discrepancy? How should we treat questions that are, or have seeds of, evil or malicious purposes and actions, such as writing spambots and malware?    Should they be answered like regular "everybody keeps their pants on" questions? Or should there be some other type of response to this bad behaviour lot? What is the easiest way to strip a desktop edition to a server edition? We have installed Ubuntu desktop edition on our development server. Now that we have it in a data center we would like to strip it down to a server edition.  Is there an easy way of doing so rather than just going in and uninstalling packages by hand? meta_query with meta values as serialize arrays I'm working on a project in which I'm creating a custom post type and custom data entered via meta boxes associated with my custom post type. For whatever reason I decided to code the meta boxes in such a way that the inputs in each metabox are part of an array. For instance, I'm storing longitude and latitude:  &lt;p&gt;      &lt;label for="latitude"&gt;Latitude:&lt;/label&gt;&lt;br /&gt;      &lt;input type="text" id="latitude" name="coordinates[latitude]" class="full-width" value="" /&gt;  &lt;/p&gt;  &lt;p&gt;          &lt;label for="longitude"&gt;Longitude:&lt;/label&gt;&lt;br /&gt;      &lt;input type="text" id="longitude" name="coordinates[longitude]" class="full-width" value="" /&gt;  &lt;/p&gt;   For whatever reason, I liked the idea of having a singular postmeta entry for each metabox. On the save_post hook, I save the data like so:  update_post_meta($post_id, '_coordinates', $_POST['coordinates']);   I did this because I have three metaboxes and I like just having 3 postmeta values for each post; however, I've now realized a potential issue with this. I may want to use WP_Query to only pull out certain posts based these meta values. For instance, I may want to get all posts that have latitude values above 50. If I had this data in the database individually, perhaps using the key latitude, I would do something like:  $args = array(     'post_type' =&gt; 'my-post-type',     'meta_query' =&gt; array(         array(             'key' =&gt; 'latitude',             'value' =&gt; '50',             'compare' =&gt; '&gt;'         )     )  ); $query = new WP_Query( $args );   Since I have the latitude as part of the _coordinates postmeta, this would not work.  So, my question is, is there a way to utilize meta_query to query a serialized array like I have in this scenario? Can somebody help me with the execute commands in Minecraft? Recently, Minecraft had removed the /testfor command, which broke these sets of commands that I was trying to execute today.  /testfor @p[r=10] {SelectedItem:{id:"minecraft:feather",tag:{display:{Name:"Roc's Feather",Lore:[Jump higher using this feather.]}}}}`   Now normally, from Minecraft 1.13 onwards, the new /execute command would've been the replacement for the /testfor command, but as I soon found out, the command failed to detect my Roc's Feather and thus could not execute an /effect command that gave me a Jump Boost, for 1 second, at level 3.  I tried remaking my feather from scratch with this command here:  /give @p minecraft:feather{display:{Name:"{\"text\":\"Roc's Feather\",\"color\":\"light_purple\",\"bold\":true,\"italic\":true,\"underlined\":false,\"strikethrough\":false,\"obfuscated\":false}",Lore:["{\"text\":\"Jump higher using this feather.\",\"bold\":false,\"italic\":true,\"underlined\":false,\"strikethrough\":false,\"obfuscated\":false}"]}} 1   But the execute command I placed did not detect this type of uniqueness.  /execute if entity @p[distance=10,nbt={SelectedItem:{id:"minecraft:feather",Count:1b,tag:{display:{Name:"{\"text\":\"Roc's Feather\",\"color\":\"light_purple\",\"bold\":true,\"italic\":true,\"underlined\":false,\"strikethrough\":false,\"obfuscated\":false}",Lore:["{\"text\":\"Jump higher using this feather.\",\"bold\":false,\"italic\":true,\"underlined\":false,\"strikethrough\":false,\"obfuscated\":false}"]}}}}] run effect give @s minecraft:jump_boost 1 3 true   Can somebody tell me what I'm doing wrong here because I cannot even tell what's the issue. I was wondering why I couldn't delete my own question. Well actually, I have accepted the question itself to be wrong and even I feel that I have accepted a wrong answer, but when I try to delete my question, I get a message saying that,"This question can't be deleted, flag it for moderator attention". Why is this happening and how can I solve this? Can I download the Winter Bash hats for use as profile picture? Can I download  and use them as my profile picture?  I actually like some of them, and want to keep them for future use. When a ball is thrown onto a wall, the ball exerts a force onto the wall. According to Newton's Third Law, the wall will exert an equal and opposite force to the ball. Thus, how would the ball be able to bounce back? Shouldn't it just slide down the wall? Can a hotel kick you out if you let an unregistered guest share a room with you? How do I make my program watch for file modification in C++? Why do we need to discard one dummy variable? Which Jedi have served in the Rebellion? Besides Luke Skywalker, Kanan Jarrus, Ezra Bridger and Ahsoka Tano, which other Jedi, regardless of whether they were survivors of Order 66 or became one at a later point, served within the Rebellion's ranks during the Galactic Civil War?  Looking for both canon and Legends versions.  Edit: ok, just to clarify what would qualify as a Jedi for the answer. Loosely speaking, anyone who follow the ideals of the Jedi philosophy - a practitioner in the ways of the Force, a protector of the galaxy, and an opposer to the dark side - would count.   Only trained Force users, not aligned with the dark side, would count. They need to be able to consciously control their use of the Force to aid the Rebellion. This excludes Leia Members of the Jedi Order of the late Republic would obviously count. However, they need to have survived Order 66 (duh), did not renounce the Jedi ways nor succumbed to the dark side, and become a member of the Rebellion. This excludes the Grand Inquisitor nor Darth Vader, but includes Kanan Jarrus and, in Legends, Rahm Kota. Those who are killed in action after joining the Rebellion also count. However, you don't need to be an official member of the order to be counted. You could be opposed to what was wrong with the late order, but as long as you follow the ideals defined above, and identify with them, you are a Jedi at heart by the count of this question. This counts Ahsoka Tano, Luke Skywalker and Ezra Bridger among its number. They aren't in the old Jedi Order's roster, but they believe in what the Jedi are meant to be, and follow its ways in that regard. Galen Marek in Legends, when he genuinely turned to the ways of the light, even though he was still a user of dark side powers, would be one. It's the thought that counts.   So loosely speaking, that means members of the Rebellion who are trained Force sensitives and genuine good guys. How to install Tor? C++ preprocessor __VA_ARGS__ number of arguments Narrow-phase collision detection algorithms