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  • Rejigging a floating point equation ...

    - by Jamie
    I'd like to know if there is a way to improve the accuracy of calculating a slope. (This came up a few months back here). It seems by changing: float get_slope(float dXa, float dXb, float dYa, float dYb) { return (dXa - dXb)/(dYa - dYb); } to float get_slope(float dXa, float dXb, float dYa, float dYb) { return dXa/(dYa - dYb) - dXb/(dYa - dYb); } might be an improvement. Suggestions? Edit: It's precision I'm after, not efficiency.

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  • Floating point comparison in STL, BOOST

    - by Paul
    Is there in the STL or in Boost a set of generic simple comparison functions? The one I found are always requiring template parameters, and/or instantiation of a struct template. I'm looking for something with a syntax like : if ( is_greater(x,y) ) { ... } Which could be implemented as : template <typename T> bool is_greater(const T& x, const T& y) { return x > y + Precision<T>::eps; }

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  • ctrl+click or shift+click not always firing the onclick event

    - by Erik
    Hi, I recently discovered that different browsers handle the onclick event differently when the control of shift key is pressed. Same thing for following links with the middle mouse button. <a href="http://www.example.com/" onclick="alert('onclick');">go to example.com</a> Onclick browser support table Mouse Keyboard Chrome Firefox Safari Opera IE5.5 IE6 IE7 IE8 IE9 Left None yes yes yes yes yes yes yes yes yes Left Ctrl yes yes yes yes ? yes no no ? Left Shift yes yes yes yes ? yes yes yes ? Middle None yes no yes no ? N/A no no ? Can someone please fill in the question marks for me? Also; I'm wondering if the behaviour differs for each version of Chrome, Firefox, Safari and Opera. Finding a logical pattern in this behaviour would be even nicer, but I don't think there is :). Thanks a lot.

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  • Floating point precision nuances.

    - by user247077
    Hi, I found this code in NVIDIA's cuda SDK samples. void computeGold( float* reference, float* idata, const unsigned int len) { reference[0] = 0; double total_sum = 0; unsigned int i; for( i = 1; i < len; ++i) { total_sum += idata[i-1]; reference[i] = idata[i-1] + reference[i-1]; } // Here it should be okay to use != because we have integer values // in a range where float can be exactly represented if (total_sum != reference[i-1]) printf("Warning: exceeding single-precision accuracy. Scan will be inaccurate.\n"); } (C) Nvidia Corp Can somebody please tell me a case where the warning would be printed, and most importantly, why. Thank you very much.

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  • Time difference in seconds (as a floating point)

    - by pocoa
    >>> from datetime import datetime >>> t1 = datetime.now() >>> t2 = datetime.now() >>> delta = t2 - t1 >>> delta.seconds 7 >>> delta.microseconds 631000 Is there any way to get that as 7.631000 ? I can use time module, but I also need that t1 and t2 variables as DateTime objects. So if there is a way to do it with datettime, that would be great.

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  • Interpreting item click in ListView

    - by Matt Huggins
    I'm working on my first Android project, and I created a menu via the XML method. My activity is pretty basic, in that it loads the main layout (containing a ListView with my String array of options). Here's the code inside my Activity: public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); // allow stuff to happen when a list item is clicked ListView ls = (ListView)findViewById(R.id.menu); ls.setOnItemClickListener(new OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { // @todo } }); } Within the onItemClick callback handler, I'd like to check which item was clicked, and load a new menu based upon that. Question 1: How do I go about figuring out which item was clicked? I can't find any straightforward examples on retrieving/testing the id value of the clicked item. Question 2: Once I have the id value, I assume I can just call the setContentView method again to change to another layout containing my new menu. Is that correct?

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  • HTML5 click event

    - by RichadC
    I made an array of squares ctx.fillStyle = "rgb(0,0,0)"; for(x=0;x<=25;x++){ for(y=0;y<=25;y++){ ctx.fillRect(x, y, 20, 20); } } and I want a square to change its colour when clicked. How can I do that? I'm don't know much HTML5 and need some help. Thanks

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  • Logging library for (c++) games

    - by Klaim
    I know a lot of logging libraries but didn't test a lot of them. (GoogleLog, Pantheios, the coming boost::log library...) In games, especially in remote multiplayer and multithreaded games, logging is vital to debugging, even if you remove all logs in the end. Let's say I'm making a PC game (not console) that needs logs (multiplayer and multithreaded and/or multiprocess) and I have good reasons for looking for a library for logging (like, I don't have time or I'm not confident in my ability to write one correctly for my case). Assuming that I need : performance ease of use (allow streaming or formating or something like that) reliable (don't leak or crash!) cross-platform (at least Windows, MacOSX, Linux/Ubuntu) Wich logging library would you recommand? Currently, I think that boost::log is the most flexible one (you can even log to remotely!), but have not good performance update: is for high performance, but isn't released yet. Pantheios is often cited but I don't have comparison points on performance and usage. I've used my own lib for a long time but I know it don't manage multithreading so it's a big problem, even if it's fast enough. Google Log seems interesting, I just need to test it but if you already have compared those libs and more, your advice might be of good use. Games are often performance demanding while complex to debug so it would be good to know logging libraries that, in our specific case, have clear advantages.

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  • Logging library for (c++) games

    - by Klaim
    I know a lot of logging libraries but didn't test a lot of them. (GoogleLog, Pantheios, the coming boost::log library...) In games, especially in remote multiplayer and multithreaded games, logging is vital to debugging, even if you remove all logs in the end. Let's say I'm making a PC game (not console) that needs logs (multiplayer and multithreaded and/or multiprocess) and I have good reasons for looking for a library for logging (like, I don't have time or I'm not confident in my ability to write one correctly for my case). Assuming that I need : performance ease of use (allow streaming or formating or something like that) reliable (don't leak or crash!) cross-platform (at least Windows, MacOSX, Linux/Ubuntu) Wich logging library would you recommand? Currently, I think that boost::log is the most flexible one (you can even log to remotely!), but have not good performance. Pantheios is often cited but I don't have comparison points on performance and usage. I've used my own lib for a long time but I know it don't manage multithreading so it's a big problem, even if it's fast enough. Google Log seems interesting, I just need to test it but if you already have compared those libs and more, your advice might be of good use. Games are often performance demanding while complex to debug so it would be good to know logging libraries that, in our specific case, have clear advantages.

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  • LOD in modern games

    - by Firas Assaad
    I'm currently working on my master's thesis about LOD and mesh simplification, and I've been reading many academic papers and articles about the subject. However, I can't find enough information about how LOD is being used in modern games. I know many games use some sort of dynamic LOD for terrain, but what about elsewhere? Level of Detail for 3D Graphics for example points out that discrete LOD (where artists prepare several models in advance) is widely used because of the performance overhead of continuous LOD. That book was published in 2002 however, and I'm wondering if things are different now. There has been some research in performing dynamic LOD using the geometry shader (this paper for example, with its implementation in ShaderX6), would that be used in a modern game? To summarize, my question is about the state of LOD in modern video games, what algorithms are used and why? In particular, is view dependent continuous simplification used or does the runtime overhead make using discrete models with proper blending and impostors a more attractive solution? If discrete models are used, is an algorithm used (e.g. vertex clustering) to generate them offline, do artists manually create the models, or perhaps a combination of both methods is used?

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  • Games without a(n explicit) game loop

    - by Davy8
    Most game development happens with a main game loop. Are there any good articles/blog posts/discussions about games without a game loop? I imagine they'd mostly be web games, but I'd be interested in hearing otherwise. (As a side note, I think it's really interesting that the concept is almost exclusively used in gaming as far as I'm aware, perhaps that may be another question.) Edit: I realize there's probably a redraw loop somewhere. I guess what I really mean is a loop that is hidden to you. Frames are something you as the developer are not concerned with as you're working on a higher level of abstraction. E.g. someLootItem.moveTo(inventory, someAnimatationType) and that will move from the loot box to your inventory using the specified animation type without the game developer having to worry about the implementation details of that animation. Maybe that's how "real" games end up working, but from reading most tutorials they seem to imply a much more granular level of control is used, but that might just be an artifact of being a tutorial.

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  • Any examples of fair mmo games with quick completion

    - by Keith Player
    I'm looking for some example games for inspiration that allow from 10 to a large number of players at a time and can be completed in 10 to 30 minutes. I'm looking for something that would have extremely low bandwidth and not be dependent on chance or luck (i.e one player can't gain an unfair advantage because the computer put them in a better position). Realized on the way home that more clarifications might have been helpful. I'm looking to develop a pay-to-play competition that would allow a large number of players to compete in a relatively short period of time. One way would be to have an mmo that can be completed in 30 minutes, another way would be if you could have 10 person games that finish in under 5 minutes and then have the winners compete against each other until a winner is decided. I'm interested in any genre that would make for a fun/interesting game that doesn't depend on luck, so all players should have the same choice/availability of activities/resources and follow the same rules. Some possible games that could possibly be modified into what I want, would be bztanks (too easy to create a bot), diplomacy (takes too long), risk, some chess like game. I was just wondering if there are other game types to the ones I have been considering.

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  • What is a Bias Value of Floating Point Numbers?

    - by mudge
    In learning how floating point numbers are represented in computers I have come across the term "bias value" that I do not quite understand. The bias value in floating point numbers has to do with the negative and positiveness of the exponent part of a floating point number. The bias value of a floating point number is 127 which means that 127 is always added to the exponent part of a floating point number. How does doing this help determine if the exponent is negative or positive or not?

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  • Dlink DWA-556 Access point fails to start on 2.6.35-25 while 2.6.35-24 works. How can I do this with >2.6.35-24?

    - by Azendale
    I'm using hostapd to run an access point with a Dlink DWA-556 wireless N card. However, I can no longer get it to start when I use kernels greater than 2.6.35-24. Here's a log where I ran the uname -a&&hostapd -c <configfile> on the different kernel versions. Linux erikbandersen 2.6.35-24-generic #42-Ubuntu SMP Thu Dec 2 02:41:37 UTC 2010 x86_64 GNU/Linux Configuration file: hostapd.conf ctrl_interface_group=0 Opening raw packet socket for ifindex 248 BSS count 1, BSSID mask ff:ff:ff:ff:ff:ff (0 bits) SIOCGIWRANGE: WE(compiled)=22 WE(source)=21 enc_capa=0xf nl80211: Added 802.11b mode based on 802.11g information HT40: control channel: 2 secondary channel: 6 RATE[0] rate=10 flags=0x2 RATE[1] rate=20 flags=0x6 RATE[2] rate=55 flags=0x6 RATE[3] rate=110 flags=0x6 RATE[4] rate=60 flags=0x0 RATE[5] rate=90 flags=0x0 RATE[6] rate=120 flags=0x0 RATE[7] rate=180 flags=0x0 RATE[8] rate=240 flags=0x0 RATE[9] rate=360 flags=0x0 RATE[10] rate=480 flags=0x0 RATE[11] rate=540 flags=0x0 Passive scanning not supported Mode: IEEE 802.11g Channel: 2 Frequency: 2417 MHz Flushing old station entries Deauthenticate all stations Using interface wlan1 with hwaddr 1c:bd:b9:d5:e8:3c and ssid 'erikbandersen.com/freewifi' wlan1: Setup of interface done. MGMT (TX callback) ACK Malformed netlink message: len=436 left=256 plen=420 256 extra bytes in the end of netlink message MGMT (TX callback) ACK mgmt::proberesp cb MGMT (TX callback) ACK mgmt::proberesp cb MGMT (TX callback) ACK mgmt::proberesp cb mgmt::auth authentication: STA=3c:4a:92:0e:41:2f auth_alg=0 auth_transaction=1 status_code=0 wep=0 New STA wlan1: STA 3c:4a:92:0e:41:2f IEEE 802.11: authentication OK (open system) wlan1: STA 3c:4a:92:0e:41:2f MLME: MLME-AUTHENTICATE.indication(3c:4a:92:0e:41:2f, OPEN_SYSTEM) wlan1: STA 3c:4a:92:0e:41:2f MLME: MLME-DELETEKEYS.request(3c:4a:92:0e:41:2f) authentication reply: STA=3c:4a:92:0e:41:2f auth_alg=0 auth_transaction=2 resp=0 (IE len=0) MGMT (TX callback) ACK mgmt::auth cb wlan1: STA 3c:4a:92:0e:41:2f IEEE 802.11: authenticated mgmt::assoc_req association request: STA=3c:4a:92:0e:41:2f capab_info=0x421 listen_interval=10 Validating WMM IE: OUI 00:50:f2 OUI type 2 OUI sub-type 0 version 1 QoS info 0x0 HT: STA 3c:4a:92:0e:41:2f HT Capabilities Info: 0x102c handle_assoc STA 3c:4a:92:0e:41:2f - no greenfield, num of non-gf stations 1 handle_assoc STA 3c:4a:92:0e:41:2f - 20 MHz HT, num of 20MHz HT STAs 1 hostapd_ht_operation_update current operation mode=0x0 hostapd_ht_operation_update new operation mode=0x7 changes=2 new AID 1 wlan1: STA 3c:4a:92:0e:41:2f IEEE 802.11: association OK (aid 1) MGMT (TX callback) ACK mgmt::assoc_resp cb wlan1: STA 3c:4a:92:0e:41:2f IEEE 802.11: associated (aid 1) wlan1: STA 3c:4a:92:0e:41:2f MLME: MLME-ASSOCIATE.indication(3c:4a:92:0e:41:2f) wlan1: STA 3c:4a:92:0e:41:2f MLME: MLME-DELETEKEYS.request(3c:4a:92:0e:41:2f) wlan1: STA 3c:4a:92:0e:41:2f RADIUS: starting accounting session 4DAC8224-00000000 MGMT (TX callback) ACK mgmt::action cb MGMT (TX callback) ACK mgmt::proberesp cb MGMT (TX callback) ACK mgmt::proberesp cb MGMT (TX callback) ACK mgmt::proberesp cb MGMT (TX callback) ACK mgmt::proberesp cb MGMT (TX callback) ACK mgmt::proberesp cb Signal 2 received - terminating wlan1: STA 3c:4a:92:0e:41:2f MLME: MLME-DEAUTHENTICATE.indication(3c:4a:92:0e:41:2f, 1) wlan1: STA 3c:4a:92:0e:41:2f MLME: MLME-DELETEKEYS.request(3c:4a:92:0e:41:2f) Removing station 3c:4a:92:0e:41:2f hostapd_ht_operation_update current operation mode=0x7 hostapd_ht_operation_update new operation mode=0x0 changes=2 Flushing old station entries Deauthenticate all stations . Linux erikbandersen 2.6.35-25-generic #44-Ubuntu SMP Fri Jan 21 17:40:44 UTC 2011 x86_64 GNU/Linux Configuration file: hostapd.conf ctrl_interface_group=0 Opening raw packet socket for ifindex 248 BSS count 1, BSSID mask ff:ff:ff:ff:ff:ff (0 bits) SIOCGIWRANGE: WE(compiled)=22 WE(source)=21 enc_capa=0xf nl80211: Added 802.11b mode based on 802.11g information Allowed channel: mode=1 chan=1 freq=2412 MHz max_tx_power=27 dBm Allowed channel: mode=1 chan=2 freq=2417 MHz max_tx_power=27 dBm Allowed channel: mode=1 chan=3 freq=2422 MHz max_tx_power=27 dBm Allowed channel: mode=1 chan=4 freq=2427 MHz max_tx_power=27 dBm Allowed channel: mode=1 chan=5 freq=2432 MHz max_tx_power=27 dBm Allowed channel: mode=1 chan=6 freq=2437 MHz max_tx_power=27 dBm Allowed channel: mode=1 chan=7 freq=2442 MHz max_tx_power=27 dBm Allowed channel: mode=1 chan=8 freq=2447 MHz max_tx_power=27 dBm Allowed channel: mode=1 chan=9 freq=2452 MHz max_tx_power=27 dBm Allowed channel: mode=1 chan=10 freq=2457 MHz max_tx_power=27 dBm Allowed channel: mode=1 chan=11 freq=2462 MHz max_tx_power=27 dBm Allowed channel: mode=0 chan=1 freq=2412 MHz max_tx_power=27 dBm Allowed channel: mode=0 chan=2 freq=2417 MHz max_tx_power=27 dBm Allowed channel: mode=0 chan=3 freq=2422 MHz max_tx_power=27 dBm Allowed channel: mode=0 chan=4 freq=2427 MHz max_tx_power=27 dBm Allowed channel: mode=0 chan=5 freq=2432 MHz max_tx_power=27 dBm Allowed channel: mode=0 chan=6 freq=2437 MHz max_tx_power=27 dBm Allowed channel: mode=0 chan=7 freq=2442 MHz max_tx_power=27 dBm Allowed channel: mode=0 chan=8 freq=2447 MHz max_tx_power=27 dBm Allowed channel: mode=0 chan=9 freq=2452 MHz max_tx_power=27 dBm Allowed channel: mode=0 chan=10 freq=2457 MHz max_tx_power=27 dBm Allowed channel: mode=0 chan=11 freq=2462 MHz max_tx_power=27 dBm HT40: control channel: 2 secondary channel: 6 RATE[0] rate=10 flags=0x2 RATE[1] rate=20 flags=0x6 RATE[2] rate=55 flags=0x6 RATE[3] rate=110 flags=0x6 RATE[4] rate=60 flags=0x0 RATE[5] rate=90 flags=0x0 RATE[6] rate=120 flags=0x0 RATE[7] rate=180 flags=0x0 RATE[8] rate=240 flags=0x0 RATE[9] rate=360 flags=0x0 RATE[10] rate=480 flags=0x0 RATE[11] rate=540 flags=0x0 Passive scanning not supported Mode: IEEE 802.11g Channel: 2 Frequency: 2417 MHz Could not set channel for kernel driver wlan1: Unable to setup interface. My wireless card is listed as 02:00.0 Network controller: Atheros Communications Inc. AR5008 Wireless Network Adapter (rev 01) by lspci. Am I doing it wrong and there's a new way of doing it? I'm holding off upgrading to Natty because of this. What changed between the versions that would cause this? Should I report it as a bug?

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  • box2d resize bodies arround point

    - by philipp
    I have a compound object, consisting of a b2Body, vector-graphics and a list polygons which describe the b2body's shapes. This object has its own transformation matrix to centralize the storage of transformations. So far everything is working quiet fine, even scaling works, but not if i scale around a point. In the initialization phase of the object it is scaled around a point. This happens in this order: transform the main matrix transform the vector graphics and the polygons recreate the b2Body After this function ran, the shapes and all the graphics are exactly where they should be, BUT: after the first steps of the b2World the graphical stuff moves away from the body. When I ran the debugger I found out that the position of the body is 0/0 the red dot shows the center of scaling. the first image shows the basic setup and the second the final position of the graphics. This distance stays constant for the rest of the simulation. If I set the position via myBody.SetPosition( sx, sy ); the whole scenario just plays a bit more distant for the origin. Any Idea how to fix this? EDIT:: I came deeper down to the problem and it lies in the fact that i must not scale the transform matrix for the b2body shapes around the center, but set the b2body's position back to the point after scaling. But how can I calculate that point? EDIT 2 :: I came ever deeper down to it, even solved it, but this is a slow solution and i hope that there is somebody who understands what formula I need. assuming to have a set polygons relative to an origin as basis shapes for a b2body: scaling the whole object around a certain point is done in the following steps: i scale everything around the center except the polygons i create a clone of the polygons matrix i scale this clone around the point i calculate dx, dy as difference of clone.tx - original.tx and clone.ty - original.ty i scale the original polygon matrix NOT around the point i recreate the body i create the fixture i set the position of the body to dx and dy done! So what i an interested in is a formula for dx and dy without cloning matrices, scaling the clone around a point, getting dx and dy and finally scale the vertex matrix.

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  • How to calculate direction from initial point and another point?

    - by Dvole
    I'm making a simple game where I shoot things from a certain point on screen (A). I tap the screen and shoot the projectile from initial point(A) to the tap point(B). But I want the projectile to move along the same path instead and fly out of bounds of the screen. How do I calculate a point that is on the same line that these two points, but further away? This is a simple math, but I can't figure it out.

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  • fast 3d point -> cuboid volume intersection test

    - by user1130477
    Im trying to test whether a point lies within a 3d volume defined by 8 points. I know I can use the plane equation to check that the signed distance is always -1 for all 6 sides, but does anyone know of a faster way or could point me to some code? Thanks EDIT: I should add that ideally the test would produce 3 linear interpolation parameters which would lie in the range 0..1 to indicate that the point is within the volume for each axis (since I will have to calculate these later if the point is found to be in the volume)

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  • How to add the Windows defender(MS essential) in Windows explorer right click menu to scan a particular drive/folder on demand?

    - by avirk
    As we have inbuilt antivirus like Windows defender in Windows 8 now, I called it antivirus because it has embedded option of MS essential as well. But there is no option to scan a particular drive on demand by right click on it in windows explore as we had in Windows 7 with MS essential or like other antiviruses. I know we can run a custom scan for the particular drive or specific folder but that process is too lengthy and time consuming. This guide explain that how we can add the Windows Defender in the desktop right click menu, so I'm curious is there a way to add it in the Windows explorer right click menu to launch a search whenever I need to.

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  • Ctrl + right click opens mutiple items instead of selecting them. How do I fix this?

    - by Malik Hassan
    Something happened to my keyboard and or mouse controls. I have a Logitech T-BB18 trackwheel and an hp NY418AA Keyboard. When I use the mouse in Windows mail and click the delete button it deletes two emails instead of one and opens all the emails that I have selected when I ctrl + click on multiple emails to select them. When I'm in Windows Explorer ctrl + click and multiple select opens all of the files that I have selected instead of just selecting them. I really need to fix this behavior. Can someone help please?

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  • What's the difference between a wifi access point and station?

    - by Earlz
    I noticed that my (rooted) modem has some hidden modes for wifi. It has the default(and only setting without rooting) wireless access point, but it also has the settings repeater, ad-hoc, and station. What I'm really curious about is this station mode and how it differs from access point. I did a cursory search and didn't come up with any significant differences, other than that they are two distinct modes on many wireless chipsets. What is this station mode and how does it differ from access point?

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  • How to find ip address of my Asus RT-AC86U in Access Point mode?

    - by WilliamKF
    I'm using an Asus wireless router model RT-AC68U and can connect fine to the internet using it wirelessly. I configured the router to be an Access Point, but having done so, I can no longer locate the GUI to adjust the router as I have no idea what its IP Address is anymore. The router is plugged into a cable modem and router which is a model SMCD3G is a business class gateway labeled Comcast Business IP Gateway. This gateway is assigning ip addresses in the range 10.1.10.XX and I went to the web interface at 10.1.10.1 and listed the connected devices and see my laptop which is connected to the Asus access point along with a few other devices, but none of the devices listed are the Asus router (I tried all the six ip addresses listed). How can I determine the IP Address of my Asus router in access point mode so I can see the GUI interface again to control the router other than by doing a factory reset?

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  • How to remove Games on Fedora 14?

    - by user44212
    While installing the fedora desktop I had unchecked the Games and Entertainment section but I can still see the same Games options available in the menu. I tried checking the same in the Add/Remove Programs but I was not able to get the option for uninstalling the same. Games which are present are: AisleRiot Solitaire, lagno, Mines and Sudoku I would like to delete the games options available. Can someone help me doing the same?

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