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  • How to optimise mesh data

    - by Wardy
    So i have some procedurally generated mesh data and i want to reduce it down to its minimum number of verts. In case it matters this is a unity project. Working on the basis of a simple example, lets assume a typical flat surface of points 2 by 3. The point / vertex at [1,1] is used in many triangles. I've generated mesh for a voxel type engine that adds verts to a list based on face visiblility and now I want to remove all the duplicates. Can anyone come up with an efficient way of doing this because what i have is sooo bad its not even funny (and i don't even think it's logically correct) ... private void Optimize() { Vector3 v; Vector3 v2; for (int i = 0; i < Vertices.Count; i++) { v = Vertices[i]; for (int j = i+1; j < Vertices.Count; j++) { v2 = Vertices[j]; if (v.x == v2.x && v.y == v2.y && v.z == v2.z) { for (int ind = 0; ind < Indices.Count; ind++) { if (Indices[ind] == j) { Indices[ind] = i; } else if (Indices[ind] > j && Indices[ind] > 0) Indices[ind]--; } Vertices.RemoveAt(j); Uvs.RemoveAt(j); Normals.RemoveAt(j); } } } } EDIT: Ok i managed to get this (code sample above updated) to render an "optimised" set of verts but the UV data is all wrong now, which would make sense because i'm basically just removing any UV Vector that represents a UV coord for a removed vert and not actually considering what I need to do to "fix the tri" so to speak. The code now seemingly does work but its quite time consuming, still looking to further optimise.

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  • finding houses within a radius

    - by paul smith
    During an interview I was asked given the following: A real estate application that lists all houses that are currently on the market (i.e., for sale) within a given distance (say for example the user wants to find all houses within 20 miles), how would you design your application (both data structure and alogirithm) to build this type of service? Any ideas? How would you implement it? I told him I didn't know becaue I've never done any geo-related stuff before.

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  • SQL Down Under Podcast - Gadi Peleg - Data Quality Services

    - by Greg Low
    Well it's been a few months but I'm back on a roll creating some SQL Down Under podcasts. The first out the door is an interview with Gadi Peleg from the SQL Server team, introducing Data Quality Services.Gadi came to Microsoft when Zoomix was acquired.Details of this podcast (and other available podcasts) are here: http://www.sqldownunder.com/Resources/Podcast.aspxHope you enjoy it even though there are some telling signs that I recorded it at 3AM :-)If you are using iTunes, you can also subscribe here: http://itunes.apple.com/au/podcast/sql-down-under/id503822116?mt=2

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  • Tournament bracket method to put distance between teammates

    - by Fred Thomsen
    I am using a proper binary tree to simulate a tournament bracket. It's preferred any competitors in the bracket that are teammates don't meet each other until the later rounds. What is an efficient method in which I can ensure that teammates in the bracket have as much distance as possible from each other? Are there any other data structures besides a tree that would be better for this purpose? EDIT: There can be more than 2 teams represented in a bracket.

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  • This Week on the Green Data Center Management Front

    Among the big news this week for those looking to make their data center more environmentally friendly: Two IBM POWER7-based servers become the first four-processor systems in the industry to qualify for Energy Star status; NetApp announces plans to have execs, and other on hand to discuss green computing at SNW Spring 2010; and the feds are examining how cloud will save money and energy.

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  • Working with legacy data

    - by John Paul Cook
    We encounter legacy data as a part of life. Colleges and universities have transcript records dating back decades or even centuries. Real estate property records in the United States go as far back as Spanish and British land grants in the 1500s. Very old records are completely paper based and may be completely manually prepared, perhaps typed on a typewriter or written in longhand with a quill pen. How long should transcripts be retained? Nola Ochs graduated from college at age 95 (can you imagine...(read more)

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  • PL/SQL to delete invalid data from token Strings

    - by Jie Chen
    Previous article describes how to delete the duplicated values from token string in bulk mode. This one extends it and shows the way to delete invalid data. Scenario Support we have page_two and manufacturers tables in database and the table DDL is: SQL> desc page_two; Name NULL? TYPE ----------------------------------------- -------- ------------------------ MULTILIST04 VARCHAR2(765) SQL> SQL> desc manufacturers; Name NULL? TYPE ----------------------------------------- -------- ------ ID NOT NULL NUMBER NAME VARCHAR In table page_two, column multilist04 stores a token string splitted with common. Each token represent a valid ID in manufacturers table. My expectation is to delete invalid token strings from page_two.multilist04, which have no mapping id in manufacturers.id. For example in below SQL result: ,6295728,33,6295729,6295730,6295731,22, , value 33 and 22 are invalid data because there is no ID equals to 33 or 22 in manufacturers table. So I need to delete 33 and 22. SQL> col rowid format a20; SQL> col multilist04 format a50; SQL> select rowid, multilist04 from page_two; ROWID MULTILIST04 -------------------- -------------------------------------------------- AAB+UrADfAAAAhUAAI ,6295728,6295729,6295730,6295731, AAB+UrADfAAAAhUAAJ ,1111,6295728,6295729,6295730,6295731, AAB+UrADfAAAAhUAAK ,6295728,111,6295729,6295730,6295731, AAB+UrADfAAAAhUAAL ,6295728,6295729,6295730,6295731,22, AAB+UrADfAAAAhUAAM ,6295728,33,6295729,6295730,6295731,22, SQL> select id, encode_name from manufacturers where id in (1111,11,22,33); No rows selected SQL> Solution As there is no existing SPLIT function or related in PL/SQL, I should program it by myself. I code Split intermediate function which is used to get the token value between current splitter and next splitter. Next program is main entry point, it get each column value from page_two.multilist04, process each row based on cursor. When it get each multilist04 value, it uses above Split function to get each token string stored to singValue variant, then check if it exists in manufacturers.id. If not found, set fixFlag to 1, pending to be deleted.

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  • This Week on the Green Data Center Management Front

    Among the big news this week in green data center management: Equinix was granted LEED certification for its 2009 retrofit of its Silicon Valley SV2 International Business Exchange facility, Neuwing Energy Ventures announced it successfully registered the first voluntary Energy Efficiency Certificates in the newly launched APX North American Renewables Registry, and more.

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  • Using NumPy arrays as 2D mathematical vectors?

    - by CorundumGames
    Right now I'm using lists as position, velocity, and acceleration vectors in my game. Is that a better option than using NumPy's arrays (not the standard library's) as vectors (with float data types)? I'm frequently adding vectors and changing their values directly, then placing the values in these vectors into a Pygame Rect. The vector is used for position (because Rects can't hold floats, so we can't go "between" pixels), and the Rect is used for rendering (because Pygame will only take in Rects for rendering positions).

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  • Stop Food Waste - OS Open Data & SQL Azure

    An attempt to use Ordanance Survey OS Open Data, SQL Server and SharePoint in the construction of a system for supermarkets to supply expiring food to nearby homeless shelters. What are your servers really trying to tell you? Find out with new SQL Monitor 3.0, an easy-to-use tool built for no-nonsense database professionals.For effortless insights into SQL Server, download a free trial today.

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  • zfs raidz1-0 corrupted data, all disks are online

    - by gkcr2d2
    My zfs pool "datas" is unavailable but all my disks are online. Do you know how the problem can be fixed? root@oxygen:~# zpool status pool: datas state: UNAVAIL scan: none requested config: NAME STATE READ WRITE CKSUM datas UNAVAIL 0 0 0 insufficient replicas raidz1-0 UNAVAIL 0 0 0 corrupted data scsi-SATA_ST3000DM001-9YN_W1F0LBVX ONLINE 0 0 0 scsi-SATA_ST3000DM001-9YN_W1F0KYX9 ONLINE 0 0 0 scsi-SATA_ST3000DM001-9YN_W1F0LCC8 ONLINE 0 0 0 scsi-SATA_ST3000DM001-9YN_W1F0LBXZ ONLINE 0 0 0

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  • CTERA Adds Data Protection to Linux File Systems

    <b>Enterprise Storage Forum: </b>"CTERA Networks is giving the Linux Ext3 file system additional data protection in the form of new snapshot capabilities. The file system is also the basis of the company's Cloud-Attached Storage appliances, the C200 and CloudPlug."

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  • Updated Master Data Services Documentation and Resources

    - by mattande
    (This post was contributed by Reagan Templin, Lead Technical Writer for the MDS Team) With the release of SQL Server 2008 R2, it’s a great time to check out the updated documentation and resources for the release, and for SQL Server 2008 R2 Master Data Services ("MDS") in particular. As you saw in the last post ( New White Papers Available ), there are some great white papers available on MSDN to get you going with MDS. Below you’ll find more information about other updated and newly published content....(read more)

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  • Configuring Oracle as a Data Source for SQL Server

    Discover what happens within SQL Server during and after configuring Oracle as a data source. Quite a few objects are created, including a system-level database, numerous jobs running under the SQL Server agent, and flat files created on the file system. Read on to learn more.

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  • zfs raidz1-0 corrupted data, all disk are online

    - by gkcr2d2
    my zfs pool "datas" is unavailable but all my disk are online, Do you know how the problem can be fixed? Thank you for your help. root@oxygen:~# zpool status pool: datas state: UNAVAIL scan: none requested config: NAME STATE READ WRITE CKSUM datas UNAVAIL 0 0 0 insufficient replicas raidz1-0 UNAVAIL 0 0 0 corrupted data scsi-SATA_ST3000DM001-9YN_W1F0LBVX ONLINE 0 0 0 scsi-SATA_ST3000DM001-9YN_W1F0KYX9 ONLINE 0 0 0 scsi-SATA_ST3000DM001-9YN_W1F0LCC8 ONLINE 0 0 0 scsi-SATA_ST3000DM001-9YN_W1F0LBXZ ONLINE 0 0 0

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  • Upgrading Data Tier Applications in SQL Server 2008 R2

    Changes are inevitable and like many other things in life your application will change over time. The question is how to upgrade an already deployed Data Tier Application to a newer version; what are the different methods available for upgrade and what considerations should you take? Join SQL Backup’s 35,000+ customers to compress and strengthen your backups "SQL Backup will be a REAL boost to any DBA lucky enough to use it." Jonathan Allen. Download a free trial now.

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