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  • Typical collision detection

    - by marcg11
    I would like to know how is the typical collision detection of most games. For example, you control a character which can move in 2 dimensional directions (except up and down). Now lets asume he walks into a wall, most of the games depending on character angle and the BB normal face will only stop the player in one axis, but will continue moving in the other along the wall axis. How is that done? I've only managed to stop the character from going through the wall by seting the position to the last one in the past frame if the new position colllisions the bounding box. But this just makes the player stop sharply and unrealisticly.

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  • Does 3d modeling software *choice used during asset creation affect performance at runtime

    - by user134143
    Does software used to create 3d assets (for game development specifically) have an impact on the efficiency of the program. In other words. Is it possible to reduce the operating footprint of an application merely by utilizing alternative development software during production of 3d assets. If you use two different applications to create a 3 dimensional image of a box, can one of them result in better performance if aspects of the image are identical? Sorry if this question seems vague, I am attempting to get the information I need without causing unnecessary debate over specific software choice. Thank you.

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  • Algorithm to calculate trajectories from vector field

    - by cheeesus
    I have a two-dimensional vector field, i.e., for each point (x, y) I have a vector (u, v), whereas u and v are functions of x and y. This vector field canonically defines a set of trajectories, i.e. a set of paths a particle would take if it follows along the vector field. In the following image, the vector field is depicted in red, and there are four trajectories which are partly visible, depicted in dark red: I need an algorithm which efficiently calculates some trajectories for a given vector field. The trajectories must satisfy some kind of minimum denseness in the plane (for every point in the plane we must have a 'nearby' trajectory), or some other condition to get a reasonable set of trajectories. I could not find anything useful on Google on this, and Stackexchange doesn't seem to handle the topic either. Before I start devising such an algorithm by myself: Are there any known algorithms for this problem? What is their name, for which keywords do I have to search?

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  • How can I use WebGL to create a tile-based multi-layer scrolling platform game?

    - by Nicholas Hill
    I've found WebGL (based on OpenGL) to be a fiendish and unforgiving framework for those learning to write HTML5-based games. Despite the presence of many examples on how to get started, I'm really struggling to understand how I could simply load a bunch of images and render them to a canvas quickly using WebGL. My specific scenario involves trying to render a map using a bespoke but simple multi-layered tile engine, where each value in a three dimensional array points to the image to use for that location in the rendered image. Think "Sonic the Hedgehog" via tilesets, tiles, maps, layers, sprites etc. Can anyone enlighten me: 1) How can I load an image that I can use as a texture in WebGL? 2) How can I dynamically select an image at run time and draw it at any co-ordinate, that I also select at run time?

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  • Create a fast algorithm for a "weighted" median

    - by Hameer Abbasi
    Suppose we have a set S with k elements of 2-dimensional vectors, (x, n). What would be the most efficient algorithm to calculate the median of the weighted set? By "weighted set", I mean that the number x has a weight n. Here is an example (inefficient due to sorting) algorithm, where Sx is the x-part, and Sn is the n-part. Assume that all co-ordinate pairs are already arranged in Sx, with the respective changes also being done in Sn, and the sum of n is sumN: sum <= 0; i<= 0 while(sum < sumN) sum <= sum + Sn(i) ++i if(sum > sumN/2) return Sx(i) else return (Sx(i)*Sn(i) + Sx(i+1)*Sn(i+1))/(Sn(i) + Sn(i+1)) EDIT: Would this hold in two or more dimensions, if we were to calculate the median first in one dimension, then in another, with n being the sum along that dimension in the second pass?

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  • how to deal with parallel programming

    - by nkint
    Hi. I know that parallel programming is a big resource in computer graphics, with moder machines, and mayebe a computing model that will be grow up in the near future (is this trend true?). I want to know what is the best way to deal with it. there is some practical general purpose usefulness in studying processor n-dimensional mesh, or bitonic sort in p-ram machines or it's only theory for domain specific hardware used in real particular signal elaborations of scientific simulations? Is this the best way to acquire the know how for how to become acquainted with cuda or opencl? (i'm interested in computer graphics applications) and why functional programming is so important to understand parallel computing? ps: as someone has advice me i have forked this discussion from http://stackoverflow.com/questions/4908677/how-to-deal-with-parallel-programming

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  • How to implement the setup rules like Clash of Clan?

    - by user25959
    Now I'm already implement the setup build rules which the building could move by unit grid width and height. But the validation detection is poor efficiency. The algorithm cost me 10~12(ms) in average when I move the building. Here is my approach to that: 1.Basic Grid, it is a two dimensional array. Grid[row][column], so that I can save info for each grid. Like whether is it in occupied or excluded. 2.Exclude Space, this is a space which limit same building numbers in space.

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  • Algorithms for positioning rectangles evenly spaced with unknown connecting lines

    - by MacGyver
    I'm new to game development, but I'm trying to figure out a good algorithm for positioning rectangles (of any width and height) in a given surface area, and connecting them with any variation of lines. Two rectangles will never have more than one line connecting them. Where would I begin working on a problem like this? This is only a 2 dimensional surface. I read about graph theory, and it seems like this is a close representation of that. The rectangles would be considered a node, and the lines connecting them would be considered an edge in graph theory.

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  • Can WebGL be used to create a tile-based multi-layer scrolling platform game?

    - by Nicholas Hill
    I've found WebGL (based on OpenGL) to be a fiendish and unforgiving framework for those learning to write HTML5-based games. Despite the presence of many examples on how to get started, I'm really struggling to understand how I could simply load a bunch of images and render them to a canvas quickly using WebGL. My specific scenario involves trying to render a map using a bespoke but simple multi-layered tile engine, where each value in a three dimensional array points to the image to use for that location in the rendered image. Think "Sonic the Hedgehog" via tilesets, tiles, maps, layers, sprites etc. Can anyone enlighten me: 1) How can I load an image that I can use as a texture in WebGL? 2) How can I dynamically select an image at run time and draw it at any co-ordinate, that I also select at run time?

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  • TGA loader: reverse height

    - by aVoX
    I wrote a TGA image loader in Java which is working perfectly for files created with GIMP as long as they are saved with the option "origin" set to "Top Left" (Note: Actually TGA files are meant to be stored upside down - "Bottom Left" in GIMP). My problem is that I want my image loader to be capable of reading all different kinds of TGAs, so my question is, how do I flip the image upside down? Note that I store all image data inside a one-dimensional byte array, because OpenGL (glTexImage2D to be specific) requires it that way. Thanks in advance.

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  • TGA loader: reverse y-axis

    - by aVoX
    I've written a TGA image loader in Java which is working perfectly for files created with GIMP as long as they are saved with the option origin set to Top Left (Note: Actually TGA files are meant to be stored upside down - Bottom Left in GIMP). My problem is that I want my image loader to be capable of reading all different kinds of TGA, so my question is: How do I flip the image upside down? Note that I store all image data inside a one-dimensional byte array, because OpenGL (glTexImage2D to be specific) requires it that way. Thanks in advance.

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  • How do I calculate the motion of 2 massive bodies in space?

    - by 1224
    I'm writing code simulating the 2-dimensional motion of two massive bodies with gravitational fields. The bodies' masses are known and I have a gravitational force equation. I know from that force I can get a differential equation for coordinates. I know that I once I solve this equation I will get the coordinates. I will need to make up some initial position and some initial velocity. I'd like to end up with a numeric solver for the ordinal differential equation for coordinates to get the formulas that I can write in code. Could someone break down how from laws and initial conditions we get to the formulas that calculate x and y at time t?

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  • What kind of math should I be expecting in advanced programming?

    - by I_Question_Things_Deeply
    And I don't mean just space shooters and such, because in non-3D environments it's obvious that not much beyond elementary math is needed to implement. Most of the programming in 2D games is mostly going to involve basic arithmetic, algorithms for enemy AI and dimensional worlds, rotation, and maybe some Algebra as well depending on how you want to design. But I ask because I'm not really gifted with math at all. I get frustrated and worn out just by doing Pre-Algebra, so Algebra 2 and Calculus would likely be futile for me. I guess I'm not so "right-brained" when it comes down to pure numbers and math formulas, but the bad part is that I'm no art-expert either. What do you people here suppose I should do? Go along avoiding as much of the extremely difficult maths I can't fathom, or try to ease into more complex math as I excel at programming?

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  • 2d engine with WebGL

    - by Philipp
    I am currently developing a HTML5 canvas game with a sprite-based 2d engine. The engine is working well so far, but now I thought that I could maybe add some cool graphic effects when I would re-implement the whole engine with WebGL. The whole graphic engine would stay strictly two-dimensional (think of it as a 3d world where the z coordinate of all vertices is 0.0). What I hope to gain from this is the ability to use pixel shaders to create special effects. I also think that the performance could improve. What do you think about that plan?

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  • WPF MVVM ComboBox SelectedItem or SelectedValue not working

    - by cjibo
    Update After a bit of investigating. What seems to be the issue is that the SelectedValue/SelectedItem is occurring before the Item source is finished loading. If I sit in a break point and weight a few seconds it works as expected. Don't know how I'm going to get around this one. End Update I have an application using in WPF using MVVM with a ComboBox. Below is the ViewModel Example. The issue I'm having is when we leave our page and migrate back the ComboBox is not selecting the current Value that is selected. View Model public class MyViewModel { private MyObject _selectedObject; private Collection<Object2> _objects; private IModel _model; public MyViewModel(IModel model) { _model = model; _objects = _model.GetObjects(); } public Collection<MyObject> Objects { get { return _objects; } private set { _objects = value; } } public MyObject SelectedObject { get { return _selectedObject; } set { _selectedObject = value; } } } For the sake of this example lets say MyObject has two properties (Text and Id). My XAML for the ComboBox looks like this. XAML <ComboBox Name="MyComboBox" Height="23" Width="auto" SelectedItem="{Binding Path=SelectedObject,Mode=TwoWay}" ItemsSource="{Binding Objects}" DisplayMemberPath="Text" SelectedValuePath="Id"> No matter which way I configure this when I come back to the page and the object is reassembled the ComboBox will not select the value. The object is returning the correct object via the get in the property though. I'm not sure if this is just an issue with the way the ComboBox and MVVM pattern works. The text box binding we are doing works correctly.

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  • MVC Html.ActionLink not passing querystring properly

    - by Dave Hanna
    This seems like it should be pretty straight forward, but I'm apparently confused. I have a List view that displays a paged list. At the bottom I have a set of actionlinks: <%= Html.ActionLink("First Page", "List", new { page = 1} ) %> &nbsp; <%= Html.ActionLink("Prev Page", "List", new { page = Model.PageNumber - 1 }) %> &nbsp; <%= Html.ActionLink("Next Page", "List", new { page = Model.PageNumber + 1 }) %> &nbsp; <%= Html.ActionLink("Last Page", "List", new { page = Model.LastPage } )%> I'm using the basic default routes setup, except with "List" substituted for "Index": routes.MapRoute( "Default", // Route name "{controller}/{action}/{id}", // URL with parameters new { controller = "Home", action = "List", id = UrlParameter.Optional } // Parameter defaults ); The problem is that the ActionLink helpers are generating links of the form: http://localhost:2083/Retrofit?page=2 rather than http://localhost:2083/Retrofit/?page=2 (with the trailing slash after the controller name & before the query string). When the first URL is routed, it completely loses the query string - if I look at Request.QueryString by the time it gets to the controller, it's null. If I enter the second URL (with the trailing slash), it comes in properly (i.e., QueryString of "page=2"). So how can I either get the ActionLink helper to generate the right URL, or get the Routing to properly parse what ActionLink is generating? Thanks.

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  • ASP.Net MVC2 DropDownListFor

    - by hermiod
    Hi all I am trying to learn MVC2, C# and Linq to Entities all in one project (yes, I am mad) and I am experiencing some problems with DropDownListFor and passing the SelectList to it. This is the code in my controller: public ActionResult Create() { var Methods = te.Methods.Select(a => a); List<SelectListItem> MethodList = new List<SelectListItem>(); foreach (Method me in Methods) { SelectListItem sli=new SelectListItem(); sli.Text = me.Description; sli.Value = me.method_id.ToString(); MethodList.Add(sli); } ViewData["MethodList"] = MethodList.AsEnumerable(); Talkback tb = new Talkback(); return View(tb); } and I am having troubles trying to get the DropDownListFor to take the MethodList in ViewData. When I try: <%:Html.DropDownListFor(model => model.method_id,new SelectList("MethodList","method_id","Description",Model.method_id)) %> It errors out with the following message DataBinding: 'System.Char' does not contain a property with the name 'method_id'. I know why this is, as it is taking MethodList as a string, but I can't figure out how to get it to take the SelectList. If I do the following with a normal DropDownList: <%: Html.DropDownList("MethodList") %> It is quite happy with this. Can anyone help?

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  • ASP.NET MVC2 Radio Button generates duplicate HTML id-s

    - by Dmitriy Nagirnyak
    Hi, It seems that the default ASP.NET MVC2 Html helper generates duplicate HTML IDs when using code like this (EditorTemplates/UserType.ascx): <%@ Control Language="C#" Inherits="System.Web.Mvc.ViewUserControl<UserType>" %> <%: Html.RadioButton("", UserType.Primary, Model == UserType.Primary) %> <%: Html.RadioButton("", UserType.Standard, Model == UserType.Standard) %> <%: Html.RadioButton("", UserType.ReadOnly, Model == UserType.ReadOnly) %> The HTML it produces is: <input checked="checked" id="UserType" name="UserType" type="radio" value="Primary" /> <input id="UserType" name="UserType" type="radio" value="Standard" /> <input id="UserType" name="UserType" type="radio" value="ReadOnly" /> That clearly shows a problem. So I must be misusing the Helper or something. I can manually specify the id as html attribute but then I cannot guarantee it will be unique. So the question is how to make sure that the IDs generated by RadioButton helper are unique for each value and still preserve the conventions for generating those IDs (so nested models are respected? (Preferably not generating IDs manually.) Thanks, Dmitriy,

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  • Hibernate Criteria: Perform JOIN in Subquery/DetachedCriteria

    - by Gilean
    I'm running into an issue with adding JOIN's to a subquery using DetachedCriteria. The code looks roughly like this: Criteria criteria = createCacheableCriteria(ProductLine.class, "productLine"); criteria.add(Expression.eq("productLine.active", "Y")); DetachedCriteria subCriteria = DetachedCriteria.forClass(Models.class, "model"); subCriteria.setProjection(Projections.rowCount()); subCriteria.createAlias("model.language", "modelLang"); criteria.add(Expression.eq("modelLang.language_code", "EN")); subCriteria.add(Restrictions.eqProperty("model.productLine.id","productLine.id")); criteria.add(Subqueries.lt(0, subCriteria)); But the logged SQL does not contain the JOIN in the subquery, but does include the alias which is throwing an error SELECT * FROM PRODUCT_LINES this_ WHERE this_.ACTIVE=? AND ? < (SELECT COUNT(*) AS y0_ FROM MODELS this0__ WHERE modelLang3_.LANGUAGE ='EN' AND this0__.PRODUCT_LINE_ID =this_.ID ) How can I add the joins to the DetachedCriteria? Hibernate version: 3.2.6.ga Hibernate core: 3.3.2.GA Hibernate annotations: 3.4.0.GA Hibernate commons-annotations: 3.3.0.ga Hibernate entitymanager: 3.4.0.GA Hibernate validator: 3.1.0.GA

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  • Linq The specified type 'string' is not a valid provider type.

    - by Joe Pitz
    Using Linq to call a stored procedure that passes a single string, The stored procedure returns a data set row that contains a string and an int. Code: PESQLDataContext pe = new PESQLDataContext(strConnStr); pe.ObjectTrackingEnabled = false; gvUnitsPassed.DataSource = pe.PassedInspection(Line); gvUnitsPassed.DataBind(); pe.dispose(); When the code runs an exception gets called below: The exception is thrown at the IExecuteResult result = statement: Enclosed is my result class in the designer.cs file. [Function(Name = "dbo.PassedInspection")] public ISingleResult<PassedInspectionResult> PassedInspection([Parameter(Name = "Model", DbType = "VarChar(4)")] string model) { IExecuteResult result = this.ExecuteMethodCall(this, ((MethodInfo)(MethodInfo.GetCurrentMethod())), model); return ((ISingleResult<PassedInspectionResult>)(result.ReturnValue)); } public partial class PassedInspectionResult { private string _Date; private int _Passed; public PassedInspectionResult() { } [Column(Storage = "_Date", DbType = "string NULL")] public string Date { get { return this._Date; } set { if ((this._Date != value)) { this._Date = value; } } } [Column(Storage = "_Passed", DbType = "Int NULL")] public int Passed { get { return this._Passed; } set { if ((this._Passed != value)) { this._Passed = value; } } } } } I have other stored procedures with similar arguments that run just fine. Thanks

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  • MVC: Nested Views, and Controllers (for a website)

    - by incrediman
    I'm doing a PHP website using the MVC pattern. I am not using a framework as the site is fairly simple and I feel that this will give me a good opportunity to learn about the pattern directly. I have a couple questions. Question 1: How should I organize my views? I'm thinking of having a Page view which will have the header and footer, and which will allow for a Content view to be nested between them. Question 2: If I have 5 Content pages, should I make 5 different views that can be used as the content that is nested within the Page view? Or, should I make them all extend an abstract view called AbstractContent? Question 3: What about controllers? I think there should be one main controller at least. But then where does the request go from there? To another controller? Or should I just call the Page view and leave it at that? I thought that controllers were supposed to handle input, possibly modify a model, and select a view. But what if one of the views nested within the view that a controller calls requires additional input to be parsed? Question 4: Are controllers allowed to pass parameters into the view? Or should the controller simply modify the model, which will then affect the view? Or is the model only for DB access and other such things?

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  • MVC - Cocoa interface - Cocoa Design pattern book

    - by Idan
    So I started reading this book: http://www.amazon.com/Cocoa-Design-Patterns-Erik-Buck/dp/0321535022 On chapter 2 it explains about the MVC design pattern and gives and example which I need some clarification to. The simple example shows a view with the following fields: hourlyRate, WorkHours, Standarthours , salary. The example is devided into 3 parts : View - contains some text fiels and a table (the table contains a list of employees' data). Controller - comprised of NSArrayController class (contains an array of MyEmployee) Model - MyEmployee class which describes an employee. MyEmployee class has one method which return the salary according to the calculation logic, and attributes in accordance with the view UI controls. MyEmployee inherits from NSManagedObject. Few things i'm not sure of : 1. Inside the MyEmplpyee class implemenation file, the calculation method gets the class attributes using sentence like " [[self valueForKey:@"hourlyRate"] floatValue];" Howevern, inside the header there is no data member named hourlyRate or any of the view fields. I'm not quite sure how does it work, and how it gets the value from the right view field. (does it have to be the same name as the field name in the view). maybe the conncetion is made somehow using the Interface builder and was not shown in the book ? and more important: 2. how does it seperate the view from the model ? let's say ,as the book implies might happen, I decide one day to remove one of the fields in the view. as far as I understand, that means changing the way the salary method works in MyEmplpyee (cause we have one field less) , and removing one attribute from the same calss. So how is that separate the View from the Model if changing one reflect on the other ? I guess I get something wrong... Any comments ? Thanks

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  • Sqlite catalog and schema settings (for MyBatis generator)

    - by user1769754
    I have been trying to use the MyBatis generator on a Sqlite database but can't seem to find what settings to use for the XML attributes catalog and schema. The generator errors with "Generation Warnings Occured: Table configuration with catalog main, schema sqlite_master, and table testTable did not resolve to any tables" I can't find much from the sqlite website other than this which gives something like catalog = main, schema = sqlite or sqlite_master My generator XML file is <?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE generatorConfiguration PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN" "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd" > <generatorConfiguration > <context id="context"> <jdbcConnection driverClass="org.sqlite.JDBC" connectionURL="jdbc:sqlite:testDB.sqlite" userId="" password="" ></jdbcConnection> <javaModelGenerator targetPackage="model" targetProject="test/src" ></javaModelGenerator> <sqlMapGenerator targetPackage="model" targetProject="test/src" ></sqlMapGenerator> <javaClientGenerator targetPackage="model" targetProject="test" type="XMLMAPPER" ></javaClientGenerator> <table catalog="main" schema="sqlite_master" tableName="testTable" > <property name="useActualColumnNames" value="true"/> </table> </context> </generatorConfiguration> I have also tried other combinations like <table catalog="main" schema="sqlite" tableName="testTable" > <table schema="sqlite" tableName="testTable" > <table schema="sqlite_master" tableName="testTable" > <table schema="main.testTable" tableName="testTable" > Anyone here know the right settings?

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  • ASP.NET MVC2 : How to use radiobuttons in a grid ?

    - by Stef
    Again a question about RadioButtons/ RadionButtonList I've the following Model: public class **SkillLevelModel** { public long? Id { get; set; } public int? SelectedLevel { get; set;} } I've the following Controller: public class SkillController : BaseController { public ActionResult Index() { var skills = new List<SkillLevelModel>(); for (int i = 0; i < 10; i++) skills.Add(new SkillLevelModel() { Id = i, SelectedLevel = new Random().Next(0,5) }); return View(skills); } I've the following code in the View: <% foreach (var item in Model) { %> <tr> <td style="width: 30px" align="center"> <%= Html.Encode(item.Id) %> </td> <td> <% Html.RenderPartial("UCSkillLevel", item); %> </td> </tr> <% } %> I've the following code in the PartialView: <% for (int i = 0; i <= 5; i++) { %> <td align="center"> <%= Html.RadioButton("SelectedLevel", i, new { id = Model.Id + "_" + i })%> </td> <% } %> The problem is that no radiobutton is checked, althought they have a level. What's wrong here?

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  • ValueProvider.GetValue Extension Method

    - by griegs
    I have a model like this; public class QuickQuote { [Required] public Enumerations.AUSTRALIA_STATES state { get; set; } [Required] public Enumerations.FAMILY_TYPE familyType { get; set; } As you can see the two proerties are enumerations. Now I want to employ my own model binder for reasons that I won't bother getting into at the moment. So I have; public class QuickQuoteBinder : DefaultModelBinder { public object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext) { quickQuote = new QuickQuote(); try { quickQuote.state = (Enumerations.AUSTRALIA_STATES) Enum.Parse(typeof(Enumerations.AUSTRALIA_STATES), bindingContext.ValueProvider.GetValue(bindingContext.ModelName + ".state").AttemptedValue); } catch { ModelState modelState = new ModelState(); ModelError err = new ModelError("Required"); modelState.Errors.Add(err); bindingContext.ModelState.Add(bindingContext.ModelName + ".state", modelState); } The problem is that for each property, and there are heaps, I need to do the whole try catch block. What I thought I might do is create an extension method which would do the whole block for me and all i'd need to pass in is the model property and the enumeration. So I could do something like; quickQuote.state = bindingContext.ValueProvider.GetModelValue("state", ...) etc. Is this possible?

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