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• How to organized page specific CSS link tags with spark view pages and application.spark

  - by dbr

  I'm currently using ASP.NET MVC 2 and the spark view engine. The main master page (application.spark) contains all of the CSS link tags that need to be present for all pages (global stuff). However, I have some content pages that have page specific CSS tags and currently I'm just sticking the link tag in the body as something like: <content name="MainContent"> <!-- page specific csss --> <link rel="stylesheet" href="/Content/css/page_specific.css" /> My problem is that when the page renders, this tag ends up in the which is not where it needs to be. Is there a solution for this? One idea I had was to check the controller in the Application.spark page and write out which page specific css file is required for that particular controller, however, that solution doesn't seem to scale well and I would imagine there is some way of creating the link in the child page and having it render where it's supposed to by the browser.

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• Spark show logged in user

  - by Jose

  How do I show the username of the person logged in within a Spark View? The default MVC view engine had a Page object that you could get the info from. How would I do that in spark? I know that I could put the info into the viewdata dictionary, which is probably the best, but I don't want to have to write ViewData["User"] = myUser; before I return from EVERY action method. I'd like some feedback

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• Compute directional light frustum from view furstum points and light direction

  - by Fabian

  I'm working on a friends engine project and my task is to construct a new frustum from the light direction that overlaps the view frustum and possible shadow casters. The project already has a function that creates a frustum for this but its way to big and includes way to many casters (shadows) which can't be seen in the view frustum. Now the only parameter of this function are the normalized light direction vector and a view class which lets me extract the 8 view frustum points in world space. I don't have any additional infos about the scene. I have read some of the related Questions here but non seem to fit very well to my problem as they often just point to cascaded shadow maps. Sadly i can't use DX or openGl functions directly because this engine has a dedicated math library. From what i've read so far the steps are: Transform view frustum points into light space and find min/max x and y values (or sometimes minima and maxima of all three axis) and create a AABB using the min/max vectors. But what comes after this step? How do i transform this new AABB back to world space? What i've done so far: CVector3 Points[8], MinLight = CVector3(FLT_MAX), MaxLight = CVector3(FLT_MAX); for(int i = 0; i<8;++i){ Points[i] = Points[i] * WorldToShadowMapMatrix; MinLight = Math::Min(Points[i],MinLight); MaxLight = Math::Max(Points[i],MaxLight); } AABox box(MinLight,MaxLight); I don't think this is the right way to do it. The near plain probably has to extend into the direction of the light source to include potentional shadow casters. I've read the Microsoft article about cascaded shadow maps http://msdn.microsoft.com/en-us/library/windows/desktop/ee416307%28v=vs.85%29.aspx which also includes some sample code. But they seem to use the scenes AABB to determine the near and far plane which I can't since i cant access this information from the funtion I'm working in. Could you guys please link some example code which shows the calculation of such frustum? Thanks in advance! Additional questio: is there a way to construct a WorldToFrustum matrix that represents the above transformation?

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• Spark View Engine: How to set default master page name?

  - by Dave

  I use Spark View Engine with nested master pages. I have Application.spark which defines the basic layout of the website. Then there are several other masters which themselves use Application.spark as master page (Default.spark, SinlgeColumn.spark, Gallery.spark, ...) If no master page is specified in a view file, then automatically Application.spark is choosen by the Spark View Engine. Since almost all my pages use "Default.spark" as master, is there a way to configure this globally? The other possibilities would be: Set the master in each spark file individually <use master="Default" />. But that's really annoying. Rename my master files (Default.spark <- Application.spark) but that really doesn't make any sense in naming.

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• Dell Inspiron 1120 Ubuntu Light -> Desktop and now I'm having problems with wifi and suspend

  - by David N. Welton

  I got a Dell Inspiron 1120 which ships with Ubuntu Light, as well as Windows. My wife prefers Ubuntu, but obviously outside of web stuff, you can't do a lot with Light, so I went ahead and installed the Desktop version of Ubuntu (10.10 / maverick). Whereas before it suspended beautifully and connected to wifi networks flawlessly, it now displays the following problems: It seems to suspend ok, but on resume, the screen remains blank, even though the computer appears to wake up again. Wifi doesn't connect. I tried using the suggested proprietary drivers, and those don't seem to change the situation. All in all, a bit frustrating to run into these sorts of "regressions" - does anyone know what sort of drivers and such Ubuntu Light might have shipped with for this computer that made it work so well? Unfortunately, I wiped the disk in order to install the Desktop version of Ubuntu.

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• Implementing Light Volume Front Faces

  - by cubrman

  I recently read an article about light indexed deferred rendering from here: http://code.google.com/p/lightindexed-deferredrender/ It explains its ideas in a clear way, but there was one point that I failed to understand. It in fact is one of the most interesting ones, as it explains how to implement transparency with this approach: Typically when rendering light volumes in deferred rendering, only surfaces that intersect the light volume are marked and lit. This is generally accomplished by a “shadow volume like” technique of rendering back faces – incrementing stencil where depth is greater than – then rendering front faces and only accepting when depth is less than and stencil is not zero. By only rendering front faces where depth is less than, all future lookups by fragments in the forward rendering pass will get all possible lights that could hit the fragment. Can anyone explain how exactly you need to render only front faces? Another question is why do you need the front faces at all? Why can't we simply render all the lights and store the ones that overlap at this pixel in a texture? Does this approach serves as a cut-off plane to discard lights blocked by opaque geometry?

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• Center directional light shadow to the cameras eye

  - by Caesar

  I'm currently drawing my directional light shadow using this view and projection: XMFLOAT3 dir((float)pitch, (float)yaw, (float)roll); XMFLOAT3 center(0.0f, 0.0f, 0.0f); XMVECTOR lightDir = XMLoadFloat3(&dir); XMVECTOR lightPos = radius * lightDir; XMVECTOR targetPos = XMLoadFloat3(&center); XMVECTOR up = XMVectorSet(0.0f, 1.0f, 0.0f, 0.0f); XMMATRIX V = XMMatrixLookAtLH(lightPos, targetPos, up); // This is the view // Transform bounding sphere to light space. XMFLOAT3 sphereCenterLS; XMStoreFloat3(&sphereCenterLS, XMVector3TransformCoord(targetPos, V)); // Ortho frustum in light space encloses scene. float l = sphereCenterLS.x - radius; float b = sphereCenterLS.y - radius; float n = sphereCenterLS.z - radius; float r = sphereCenterLS.x + radius; float t = sphereCenterLS.y + radius; float f = sphereCenterLS.z + radius; XMMATRIX P = XMMatrixOrthographicOffCenterLH(l, r, b, t, n, f); // This is the projection Which works prefect if the center of my scene is at 0.0, 0.0, 0.0. What I would like to do is move the center of the scene relative to the cameras position. How can I do that?

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• What light attenuation function does UDK use?

  - by ananamas

  I'm a big fan of the light attenuation in UDK. Traditionally I've always used the constant-linear-quadratic falloff function to control how "soft" the falloff is, which gives three values to play with. In UDK you can get similar results, but you only need to tweak one value: FalloffExponent. I'm interested in what the actual mathematical function here is. The UDK lighting reference describes it as follows: FalloffExponent: This allows you to modify the falloff of a light. The default falloff is 2. The smaller the number, the sharper the falloff and the more the brightness is maintained until the radius is reached. Does anyone know what it's doing behind the scenes?

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• Spark engine without master page

  - by msony

  I use application.spark file for master page In my app i have login page that does not need master page I tried remove master page from my login page using this tag , but it continue to use application.spark I can fix it by adding new master page in layout folder with name blank.spark file without any code and in my login page put this tag . looks too ugly, so I'm asking you if you know another option to fix this issue? I'm using: Spark-1.1.39975.0-release

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• Correct way to import Blueprint's ie.css via DotLess in a Spark view

  - by Chris F

  I am using the Spark View Engine for ASP.NET MVC2 and trying to use Blueprint CSS. The quick guide to Blueprint says to add links to the css files like so: <link rel="stylesheet" href="blueprint/screen.css" type="text/css" media="screen, projection"> <link rel="stylesheet" href="blueprint/print.css" type="text/css" media="print"> <!--[if lt IE 8]><link rel="stylesheet" href="blueprint/ie.css" type="text/css" media="screen, projection"><![endif]--> But I'm using DotLess and wish to simplify Blueprint as suggested here. So I'm doing this in my site.less (which gets compiled to site.min.css by Chirpy): @import "screen.css"; #header { #title { .span-10; .column; } } ... Now my site can just reference site.min.css and it includes blueprint's screen.css, which includes my reset. I can also tack on an @import "print.css" after my @import "screen.css" if desired. But now, I'm trying to figure out the best way to bring in the ie.css file to have Blueprint render correctly in IE6 & IE7. In my Spark setup, I have a partial called _Styles.spark that is brought into the Application.spark and is passed a view model that includes the filenames for all stylesheets to include (and an HtmlExtension to get the full path) and they're added using an "each" iterator. <link each="var styleSheet in Model.Styles" href="${Html.Stylesheet(styleSheet)}" rel="stylesheet" type="text/css" media="all"/> Should I simply put this below the above line in my _Styles.spark file? <!--[if lt IE 8]><link rel="stylesheet" href="${Html.Stylesheet("ie.css")}" type="text/css" media="screen, projection"><![endif]--> Will Spark even process it because it's surrounded by a comment?

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• Game Review: God of Light

  Luckily I came across this title at a very early stage. If I remember correctly, I took notice of God of Light on Twitter right on the weekend it has been published on the Play Store. "Sit back and become immersed into the world of God of Light, the game that rethinks the physics puzzle genre with its unique environment exploration gameplay, amazing graphics and exclusive soundtrack created by electronic music icon UNKLE. Join cute game mascot, Shiny, on his way to saving the universe from the impending darkness. Play through a variety of exciting game worlds and dozens of levels with mind-blowing puzzles. Your goal is to explore game levels, seek for game objects that reflect, split, combine, paint, bend and teleport rays of light energy to activate the Sources of Life and bring light back to the universe." Mastering the various reflection items in God of Light is very easy to learn and new elements are introduced during the game. Amazing puzzle game Here's the initial review I posted on the Play Store: "Great change in puzzles Fantastic and refreshing concept of puzzle solving. The effects and the music match very well, putting the player in the right mood to game. Get enlightened and grow your skills until you are a true God of Light." And it remains true, even after completing the first realm completely. Similar to Quell it took me only a couple of hours during the evening to complete all levels in the available three realms, unfortunately. God of Light currently consists of 75 levels, well it's 25 in each realm to be precise, and the challenges are increasing. Compared to the iOS version from the AppStore, God of Light is available for free on Android - at least the first realm (25 levels). Unlocking the other two remaining realms is done through an in-app purchase. The visual appearance, the sound effects and the background music provided by UNKLE makes God of Light a superb package for any puzzle gamer. Whether it is simply reflecting light over multiple mirrors, or later on bending the rays of light with black holes, or using prisms to either split, enforce, or colourise your beam, God of Light is great fun and offers a good amount of joy. Check out the following screenshots for some impressions. God of Light: Astonishing graphics and visual appeal throughout the game God of Light - Introduction to the game during the first levels. New light items are introduced at each stage during the game play God of Light: Increasing complexity and puzzle fun Hopefully, Playmous is going to provide more astonishing looking realms and interesting gimmicks in future versions. Play Store: God of Light Also, check out the latest game updates on the official web site of Playmous

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• Cannot use Html.ActionLink in asp.net mvc spark files

  - by midas06

  I'm using the spark view engine with my asp.net mvc application. In my aspx pages, I can succesfully use Html.Actionlink, but when I attempt it in spark files, it doesnt show up in intellisense, and when i try to run it anyway, i get: Dynamic view compilation failed. c:\Users\midas\Documents\Visual Studio 2008\Projects\ChurchMVC\ChurchMVC\Views\Home\Index.spark(73,25): error CS1061: 'System.Web.Mvc.HtmlHelper' does not contain a definition for 'ActionLink' and no extension method 'ActionLink' accepting a first argument of type 'System.Web.Mvc.HtmlHelper' could be found (are you missing a using directive or an assembly reference?) I do have system.web.mvc referenced, and I have added in _global.spark. None of that helps. Any ideas?

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• Adding Spark button in ActionScript project

  - by PM

  Hello, I have a button skin in spark created in Catalyst. Now I want to apply this skin to my project of type ActionScript project. When I add a simple spark button to my sprite then it's not showing there. Can anyone help me to figure out how to add a Spark.Button in a Sprite? Best Regards

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• Spark view engine and ASP.NET MVC 2 strongly Typed Html Helpers

  - by dekko

  Hi. I try to use HtmlHelper.TextBoxFor with spark view engine but view crashed with exception "Dynamic view compilation failed. 'System.Web.Mvc.HtmlHelper' does not contain a definition for 'TextBoxFor' and no extension method 'TextBoxFor' accepting a first argument of type 'System.Web.Mvc.HtmlHelper' could be found (are you missing a using directive or an assembly reference?)". It is my _global.spark: <use namespace="System"/> <use namespace="System.Linq"/> <use namespace="System.Text" /> <use namespace="System.Web.Mvc"/> <use namespace="System.Web.Mvc.Html"/> <use namespace="System.Web.Routing"/> <use namespace="System.Linq.Expressions" /> <use namespace="MyModels" /> In spark-view using: ${Html.TextBoxFor(m = m.UserName)}

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• Flex spark web browser problem

  - by sheela

  am using spark web in flex its working fine in IE6 where as in IE7 , Firefox, opera and other browser its not working. on login to spark web its giving error: Problem authenticating with the server or you are not authorised to perform this operation. Please help me out regarding this Thanks n regards Sheela

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• Defining Light Coordinates

  - by Zachary

  I took a Computer Graphics exam a couple of days ago which had extra credit question like the following: A light can be defined in one of two ways. It can be defined in world coordinates, e.g. a street light, or in the viewer (eye coordinates), e.g., a head-lamp worn by a miner. In either case the viewpoint can freely change. Describe how the light should be transformed different in these two cases. Since I won't get to see the results of this until after spring break, I thought I would ask here. It seems like the analogies being used are misleading - could you not define a light source that is located at the viewers eye in world coordinates just as well as you could in eye coordinates? I've been doing some research on how OpenGL handles light, and it seems as though it always uses eye coordinates - the ModelView matrix would be applied to any light in world coordinates. In that case the answer may just be that you would have to transform light defined in world coordinates into eye coordinates using something like the ModelView matrix, while light defined in eye coordinates would only need to be transformed by the projection matrix. Then again I could be totally under thinking (or over thinking this). Another thought I had is that it determines which way you render shadows, but that has more to do with the location of the light and its type (point, directional, emission, etc) than what coordinates it is represented in. Any ideas?

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• Flex: Linebreak problem with spark.components.TextArea inside a MXDataGridItemRenderer

  - by radgar

  Hi, I have a DataGrid that has a MXDataGridItemRenderer applied as an itemEditor to one of the columns. The editor includes a spark.components.TextArea control. By default, any text item editor of a datagrid closes itself when [enter] key is pressed.. Keeping this in mind; What I want to do is: Prevent editor from closing on [SHIFT+ENTER] key but accept the linebreak (I can do this, see code below) Close the editor on [ENTER] key but do not accept the linebreak (could not achieve this) Here is the current code in the MXDataGridItemRenderer: <s:MXDataGridItemRenderer xmlns:fx="http://ns.adobe.com/mxml/2009" xmlns:s="library://ns.adobe.com/flex/spark" xmlns:mx="library://ns.adobe.com/flex/mx" focusEnabled="true" > <fx:Script> <![CDATA[ protected function onTxtDataKeyDown(event:KeyboardEvent):void { //Prevent editor from closing on [SHIFT+ENTER] key but accept the linebreak // » this works if (event.shiftKey && event.keyCode == 13) { event.stopImmediatePropagation(); } //Close the editor on [ENTER] key but do not accept the linebreak else if (event.keyCode == 13) { event.preventDefault(); } // » does not work } ]]> </fx:Script> <s:TextArea id="txtData" paddingTop="3" lineBreak="explicit" text="{dataGridListData.label}" verticalScrollPolicy="auto" horizontalScrollPolicy="off" keyDown="onTxtDataKeyDown(event)" /> I also tried the textInput event but that did not do the trick. So: How can I prevent the linebreak when the editor is closed on [enter] key? Any help is appreciated. Thanks. EDIT: If I change the spark.components.TextArea to mx.controls.TextArea, second part with event.preventDefault() will work as expected but then the first part where SHIFT+ENTER accepts the linebreak will not work.

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• TDD - Red-Light-Green_Light:: A critical view

  - by Renso

  Subject: The concept of red-light-green-light for TDD/BDD style testing has been around since the dawn of time (well almost). Having written thousands of tests using this approach I find myself questioning the validity of the principle The issue: False positive or a valid test strategy that can be trusted? A critical view: I agree that the red-green-light concept has some validity, but who has ever written 2000 tests for a system that goes through a ton of chnages due to the organic nature fo the application and does not have to change, delete or restructure their existing tests? If you asnwer to the latter question is" "Yes I had a situation(s) where I had to refactor my code and it caused me to have to rewrite/change/delete my existing tests", read on, else press CTRL+ALT+Del :-) Once a test has been written, failed the test (red light), and then you comlpete your code and now get the green light for the last test, the test for that functionality is now in green light mode. It can never return to red light again as long as the test exists, even if the test itself is not changed, and only the code it tests is changed to fail the test. Why you ask? because the reason for the initial red-light when you created the test is not guaranteed to have triggered the initial red-light result for the same reasons it is now failing after a code change has been made. Furthermore, when the same test is changed to compile correctly in case of a compile-breaking code change, the green-light once again has been invalidated. Why? Because there is no guarantee that the test code fix is in the same green-light state as it was when it first ran successfully. To make matters worse, if you fix a compile-breaking test without going through the red-light-green-light test process, your test fix is essentially useless and very dangerous as it now provides you with a false-positive at best. Thinking your code has passed all tests and that it works correctly is far worse than not having any tests at all, well at least for that part of the system that the test-code represents. What to do? My recommendation is to delete the tests affected, and re-create them from scratch. I have to agree. Hard to do and justify if it has a significant impact on project deadlines. What do you think?

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• Installing the Spark View Engine into ASP.NET MVC 2 Preview 2

  Learn how to integrate the Spark View Engine into a standard ASP.NET MVC 2 application

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• Spark-View-Engine with ASP.NET MVC2

  - by Ben

  How do you modify a ASP.NET MVC 2.0 project to work with the Spark View Engine? I tried like described here: http://dotnetslackers.com/articles/aspnet/installing-the-spark-view-engine-into-asp-net-mvc-2-preview-2.aspx But somehow it still tries to route to .aspx files. Here the code of my global.asax: public class MvcApplication : System.Web.HttpApplication { public static void RegisterRoutes(RouteCollection routes) { routes.IgnoreRoute("{resource}.axd/{*pathInfo}"); routes.MapRoute( "Default", // Route name "{controller}/{action}/{id}", // URL with parameters new { controller = "Home", action = "Index", id = "" } // Parameter defaults ); } protected void Application_Start() { SparkViewFactory svf = new SparkViewFactory(); PrecompileViews(svf); AreaRegistration.RegisterAllAreas(); RegisterRoutes(RouteTable.Routes); } public static void PrecompileViews(SparkViewFactory svf) { var controllerFactory = svf; var viewFactory = new SparkViewFactory(controllerFactory.Settings); var batch = new SparkBatchDescriptor(); batch .For<HomeController>() .For<AccountController>(); viewFactory.Precompile(batch); } } }

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• Spark VS 2010 intellisense

  - by mare

  I was thinking about switching one of my projects (and after that subsequently other projects too) to Spark View Engine but after todays research I ran into problem of a lack of Intellisense for Visual studio 2010. Not only that but it seems that the project is not maintained regularly. So I'm left with a feeling that I should not choose Spark at this time yet. However, apparently NHaml has the same "issues" too. I know it is discussed in more detail here http://stackoverflow.com/questions/1451319/asp-net-mvc-view-engine-comparison but I would still like you thoughts on what to choose or just stay with WebForms view engine for now?

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• why spark files not included in publishe folder?

  - by msony

  I tried file system publish and ftp I'm using VS2010 and .net 4.0 should i somehow include *.spark ext files to the MSBuild?

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• Why Spark viewengine renders unnecessary (or unexpected) quotes?

  - by Arnis L.

  If i add pageBaseType="Spark.Web.Mvc.SparkView" in my web.config (necessary to fix intellisense), somehow it does not render links (probably not only) correctly anymore. This is how it's supposed to look like (and does, if page base type is not specified)= This is how it looks when base type is specified= Chrome source viewer shows identical page source code for both cases= <body> <div class="content"> <div class="navigation"> <a href="/Employee/List">Employees</a> <a href="/Product/List">Products</a> <a href="/Store/List">Stores</a> <div class="navigation_title"> Navigation</div> </div> <div class="main"> <div class="content"> <h2>Employees</h2>Nothing found... &lt;a href=&quot;/Employee/Create&quot;&gt;Create&lt;/a&gt; </div> </div> </div> </body> Developer tools does not= So - why my link gets htmlencoded (if that's what happens)? If it's default behavior, then how to render raw html? Using latest Spark version, rebuilt with Asp.Net Mvc2 RC assemblies.

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• Flex Spark TitleWindow bad redraw on dragging

  - by praksant

  Hi, I have a problem with redrawing in flex 4. I have a spark titleWindow, and if i drag it faster, it looks like it's mask is one frame late after the component. it's easily visible with 1pixel thin border, because it becomes invisible even with slower movement. You can try it here (what is not my page, but it's easier to show you here than uploading example): http://flexponential.com/2010/01/10/resizable-titlewindow-in-flex-4/ If you move in direction up, you see disappearing top border. in another directions it's not that sensitive as it has wide shadow, and it's not very visible on shadow. On my computer i see it on every spark TitleWindow i have found on google, although it's much less visible with less contrast skins, without borders or with shadows. Do you see it there? i had never this problem with halo components. It's doing the same thing with different skins. I tried to delete masks from skin, cache component, skin even an application as bitmap with no success. I also turned on redraw regions in flash player, and it looks like it's one frame late after titlewindow too. Does anyone know why is it doing this or how can i prevent it? Thank you UPDATE: no answers? really?

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• ASP.net MVC 2 SPARK - Create "Add New Item" link in spark page.

  - by KarlBear

  I have a web form in SPARK which allow the editing of a Facility class that contains Rooms. When editing the Facility all the Rooms are listed for editing too. The form works fine for editing, but I would like to include a button "Add Room" that adds a new blank room below the existing ones. Any idea how this is accomplished? Currently I am doing this in my SPARK page: [All the Facility editing stuff...] <p>Room</p> <div class="small">Enter the rooms associated with this facility.</div> <div class="add"> <div id="room"> <AddFacilityRoom each="var roomModel in Model.FacilityRooms" RoomModel="roomModel" Index="roomModelIndex" /> </div> <a id="addRoom" class="add" href="events/room/add.mvc">Add a room</a> </div> AddFacilityRoom contains the html elements for editing a room. I would like add.mvc to create a new empty Room class and inject a new identical (but empty) control below the existing ones. Currently, though it opens a new page when the "Add a Room" button is clicked.

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