Forum Replies Created

Viewing 15 posts - 1 through 15 (of 16 total)
  • Author
    Posts
  • in reply to: Noobie with driver issue #103592

    David
    Participant

    Hello Joe,
    well, I can tell you the standard suggestion and that is

    Processor(CPU) Intel Core i5 or Core i7
    Memory(RAM) Min. 2 GB
    Graphics processor(GPU) Current generation consumer level ATI Radeon or Nvidia GeForce
    Harddrive (HD) Min 20 GB

    source

    a fairly popular build around 800$ would be (link)
    CPU Intel Core i5 4690k
    RAM 8 GB
    GPU GeForce GTX 970
    HD 60 GB SSD

    In all honesty though, our 10 year old desktop PC serves us well, only the gpu could use an upgrade, but with reduced water resolution the performance is acceptable. It has an intel core2 quad with an nvidia gtx8400 (i think).

    I wrote a short paper on the technical aspects of the sandbox that i can send you if you give me your email. It would be great if you want to be my “beta tester” of sorts, I just can´t publish it yet because it still contains some personal info.

    TLDR: For testing and occasional use any old high end or younger gaming pc will be okay, for a permanent installation look to spend closer to 1000$ if you want great water simulation performance.

    greetings,
    David

    in reply to: Wiki Please – so we can jointly edit and contribute #103588

    David
    Participant

    Hey grant,
    i´m not even sure there is a typical admin team for this forum. I was under the impression it´s pretty much just @okreylos in his spare time and perhaps some coworkers.

    I think we agree that this wordpress forum is non-ideal but a dedicated server for a wiki seems like a high maintenance solution and externally managed servers are expensive. However, if anyone has experience running servers, particularly wikis, that would certainly be the best solution for knowledge- and file management.
    To solve the issue of not having notifications and generally a relatively low answer rate @ssandford suggested a facebook group. Whilst I agree that more people would answer a lot quicker on facebook that would also mean that these answers, some of which are extremely helpful, can´t be found on google anymore. Also the whole closed environment facebook thing isn’t exactly in the spirit of open source software.
    i think the wordpress forum is an okay solution for now – you can always write a wiki-like article here with pictures and all. If you need to edit it you would have to repost it and delete the old one but considering how much work a wiki would be, i think we can live with the forum.

    greetings,
    David

    in reply to: VRUI menus are too small, cant read them #103587

    David
    Participant

    hello metamedian

    i´m glad to hear you sandbox is finally working!

    @liudr: again, i have no real solution but perhaps a screen magnifier software could be a viable workaround for now.

    greetings,
    David

    in reply to: corner posts #103586

    David
    Participant

    Hello,
    i may be totally wrong here but as far as i know there is currently no built in way to crop the extend of the sandbox. The boxlayout file only affects water simulation, the software will always use and thus project the entire field of view of the kinect.
    One relatively simple solution for this problem would be to
    – take a screenshot of SARandbox in fullscreen
    – import screenshot into gimp
    – make a new layer and draw black boxes over parts you don´t want to project on
    – deactivate screenshot layer
    – export as .png (or any other transparent image format)
    – use an image viewer capable of displaying transparent images to overlay it over SARndbox
    – done – the projector will not project on the posts and they wont adversely affect water simulation since they are registered as mountains

    alternative: use a window manager that lets you draw on screen and automate that process

    i have not tried any of this myself and i am sure there are better solutions if you can alter the source code or write a tool to clip the box extend

    as for calibration, just pick two points for each corner, one with the correct x-coordinate and one with the correct y-coordinate and then choose the appropriate coordinate from each point. In my experience you will end up tweaking it manually anyways so don´t worry about it all too much.

    if you can, let us know how you handled the problem so others can learn from you; I´m actually quite curious how the built went along

    greetings,
    David

    in reply to: Noobie with driver issue #103585

    David
    Participant

    Hey Joe,
    The Y520 is a laptop, mobile graphics cards have always been a bit difficult with Linux/Ar-Sandbox if i recall correctly.
    Here are a few ideas for you:
    obligatory first tip: reboot
    my next idea would be to try downloading the drivers from nvidias website, choose the mobile version! it is not necessarily the same as for the desktop 1050ti
    the issue might be that linux automatically chooses the intel gpu instead of the nvidia one, you can disable that (google for further info)
    last idea, it is highly unlikely but possible that the laptop itself is defective, try installing a windows 10 trial version to see if the issue persists in Windows
    i hope that helps, let me know if any of this or a completely different approach fixed it for you!
    greetings,
    David

    in reply to: Sand dust in projector #103582

    David
    Participant

    Hey SSandford,
    i would imagine a zoo is a fairly dusty environment, washing the sand will obviously only help if the dust comes mainly from the sand. Perhaps you can enclose the projector (and pc for that matter) in a preferably fire retardant box with glass in front of the lens and filtered intake and exhaust fans.
    Can you post some pictures of the sandbox installation so we can suggest more appropriate measures.
    greetings,
    David

    in reply to: VRUI menus are too small, cant read them #103520

    David
    Participant

    Hello Metamedian,
    Did you try running VRUI on a different Monitor?
    Did you install the correct Nvidia supplied graphics drivers?
    Did you try running VRUI without SARndbox?

    Perhaps that will do the trick, next idea would be to reinstall the graphics drivers and perhaps VRUI, if that doesn’t help you will have to reinstall Linux

    It could be useful to post you configuration (PC specs, installed OS, installed Window manager and the VRUI version you are running). Also, when did the error occur ? did it run normally before and only changed after an update?

    Greetings,
    David

    in reply to: AR sandbox help #103518

    David
    Participant

    Hi OlliyFox, welcome to the forum
    you canbuy a ready made Sandbox, expect to pay quite a bit for it though. Google will show some retailers in your area, most commercially available ones are based on a russian software similar to SARndbox. I wouldn’t suggest you go that route as it will not only be very expensive but can also take quite a while to ship.
    About building it yourself: Factor in about 800$ for a decent PC, 500$ for a projector and around 150$ for wood, sand and hardware. Add to that a mouse and keyboard and you are at 1,5k. Also this will leave you with an AR Sandbox you have no real use for.
    Do not underestimate the building part. Depending on how handy you are and the build quality you are aiming for it will take quite a while. It took us weeks, admittedly with little experience and without a proper wood workshop.
    Also, you say building it to spec – there is no spec, it greatly depends on your projector, the one most guides are based on is sold out at the time.
    If you have prior linux experience and know what you are doing it is indeed really simple to install the software, if you don’t it can get difficult.
    Doing it in a week is possible if you are willing to spend every day on it. Perhaps i’m exaggerating, i guess engineering students tend to overthink. I’d love to hear how long it took others in the forum to build theirs.

    I´m not telling you not to build your own Sandbox, it is definitely possible, many have done it. But if you have absolutely no passion for it, it may become quite a dread.

    My suggestion would be to first try to borrow or rent an AR Sandbox, at the bottom of this site you will find a world map of publicly accessible AR Sandboxes, perhaps there is one near you. Additionally you could try to search for your area and “AR Sandbox”, they tend to attract media attention and especially schools will post quite proudly about their latest gadget.
    We have a fully functional one in Cologne, Germany. I’d gladly lend it to you but i’m afraid you live far away.

    Alternatively you can always contract a carpenter near you for the woodwork and find an enthusiastic student willing to take care of the installation and configuration for little money.

    Greetings from Germany,
    David

    in reply to: Mapping color and depth pixels #103285

    David
    Participant

    Hi elisek,
    what you are trying to do sounds incredibly interesting and useful. Let me just say that i am not anywhere near qualified to talk about this but here are three things that came to my mind:
    Did you account for the different resolutions of depth and color stream? That would of course only be relevant if the coordinate system is pixel-based
    did you calibrate both in the same way? i.e. the vector orthogonal to the Box floor, i think its called camera space vector in the calibration procedure
    Is the distortion from different terrain height relevant here ?

    I highly doubt that this will help but i would love to hear about how your project is coming along.

    In another one of your posts i read about your modifications to the hydrology model, did you have any success with that?
    I am part of a group of rescue-engineering students from the university of applied sciences TH Köln and we are working on a similar idea, teaching about river flood risks, human factors and prevention. Perhaps you can share some information on your project, we are very interested in that.

    Greetings from Germany,
    David

    in reply to: Projector Question #103284

    David
    Participant

    we don´t have a great picture yet, consider this work in progress.
    projector setup.

    https://drive.google.com/open?id=0B3xXY5j2KFXAOXJDYW1vTHpaVUE

    i will make sure to post a link to all our documents in this thread once they are done.
    Our required projection distance was calculated to be 1,3m; i will measure the actual path of light next time i get a chance.

    Another note on correct mounting hight: The kinect has a 45° field of view so for a 75x100cm box it needs to be mounted 100 cm above the top of the walls, which are the maximum sand surface height. We only found out that the color image has a slightly wider field of view than the actual depth sensor when it was too late so consider that before choosing a permanent mounting hight for your kinect.

    David

    sorry if this post shows up twice, I had some issues with my internet connection

    in reply to: Two screens questions #103280

    David
    Participant

    well I´m with chuck, you are profiting from the work of somebody else who is publishing it for free. I would suggest thinking about donating part of your profits, say 50$ per Box, thats still a really cheap price to pay for this fantastic piece of software and it would accelerate the development of new features, which will help you too. And about your question: starting a window automatically can be done within linux. Perhaps hire an IT major to figure it out for you.

    @chuck I would not say that selling these is necessarily a bad thing, it will allow many schools to get the benefits of this sandbox even if they can´t find a teacher with the skills/will to build one themself. I would however expect that this company gives back to the developer and the community with donations or by publishing their own improvements to the system.

    greetings,
    David

    in reply to: Projector Question #103279

    David
    Participant

    Hey David,

    We had the same issue, we need the larger projecting distance but without the kinect throwing shadows on the sand or the whole structure being ridiculously tall. We ended up using a mirror to extend the path of light and that works really well for us. I talked about it in slightly more detail here. Maybe that setup can work well for you. We are planing to publish instructions/documentation for the physical build in a few months.

    Greetings,
    David G.

    in reply to: Good projector? #103200

    David
    Participant

    P.S. I just found this thread from a few weeks ago,
    one user (Frank Conforti) says he is using the MW632ST (the one you mentioned) successfully but is now looking for a cheaper option for a private install. Perhaps you can ask him which projector he ended up using.
    (https://arsandbox.ucdavis.edu/forums/topic/anyone-recommend-a-good-projector/#post-103148)

    The thread should be just what you are looking for as Oliver explains some issues that are important for you.

    in reply to: Teaching Resources? #103199

    David
    Participant

    We are working on short presentations teaching about floods. We focus on the man made aspects such as dams and river regulation, I´m quite sure thats not what you are looking for. In the spirit of the entire project being open source however, we will of course make them publicly available.
    Maybe an @admin could tell us how we can share documents in this forum, probably we will have to rely on links to external hosting services.

    In short I don´t think we have what you are looking for but we would also be interested in handbooks on other topics surrounding the AR Sandbox.

    Greetings from Cologne, Germany

    David

    in reply to: Good projector? #103197

    David
    Participant

    I´m sorry I kept you waiting over the weekend.
    As far as i can see the MW632ST you linked is just as expensive as the recommended MX631ST and its 16:10.
    Going by the name and the datasheets they seem to be pretty much identical otherwise (comparison).
    For the throw calculation you can use pretty much any online projector calculator as they all use the same projection angle and min/max distance data from the manufacturers official datasheets. As a matter of fact, you can just use sin(x) to figure it out yourself 😉
    I have no idea which projectors can be bought cheaply where you live but generally focus more on the brightness (lumens) and the minimum projection distance and the according image size. Since the kinects resolution of 640 by 480 pixels is the limiting factor, projector resolution really does not matter as much. See the official instructions for further suggestions.
    I do however have a few more tips for a budget build:
    – Buy used (or ask around at schools, they tend to have older projectors the want to get rid off, usually plenty bright ones! Short throws will be rare though)
    – do you really need water simulation? if not almost any old computer will do
    – find someone with a workshop who is willing to support you. Tools are expensive and good equipment and experience will make the build so much easier and quicker
    – perhaps reclaim wood, again, ask around if someone has some laying around from building a shed for example
    – don´t use kinetic sand, its expensive and not really needed. Just buy regular playsand and get it a little wet if needed (cost us 4€ for 50kg). You might want to wash it first as it can be very dusty otherwise.
    – perhaps find a sponsor (local computershop for example). The AR Sandbox looks cool and companies will want their name on it. Don’t forget to acknowledge the creators of the original project, KeckCAVES, and the government grant they got. Find the suggested plaque here

    I hope that helps!
    Sorry it took me so long to reply,
    David

    • This reply was modified 1 year, 11 months ago by  David.
Viewing 15 posts - 1 through 15 (of 16 total)