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• Method of transforming 3D vectors with a matrix

  - by Drew Noakes

  I've been doing some reading on transforming Vector3 with matrices, and am tossing up digging deeper into the math and coding this myself versus using existing code. For whatever reason my school curriculum never included matrices, so I'm filling a gap in my knowledge. Thankfully I only need a few simple things, I think. Context is that I'm programming a robot for the RoboCup 3D league. I'm coding it in C# but it'll have to run on Mono. Ideally I wouldn't use any existing graphics libraries for this (WinForms/WPF/XNA) as all I really need is a neat subset of matrix transformations. Specifically, I need translation and x/y/z rotations, and a way of combining multiple transformations into a single matrix. This will then be applied to my own Vector3 type to produce the transformed Vector3. I've read different advice about this. For example, some model the transformation with a 4x3 matrix, others with a 4x4 matrix. Also, some examples show that you need a forth value for the vector's matrix of 1. What happens to this value when it's included in the output? [1 0 0 0] [x y z 1] * [0 1 0 0] = [a b c d] [0 0 1 0] [2 4 6 1] The parts I'm missing are: What sizes my matrices should be Compositing transformations by multiplying the transformation matrices together Transforming 3D vectors with the resulting matrix As I mostly just want to get this running, any psuedo-code would be great. Information about what matrix values perform what transformations is quite clearly defined on many pages, so need not be discussed here unless you're very keen :)

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• Simulating 3D 'cards' with just orthographic rendering

  - by meds

  I am rendering textured quads from an orthographic perspective and would like to simulate 'depth' by modifying UVs and the vertex positions of the quads four points (top left, top right, bottom left, bottom right). I've found if I make the top left and bottom right corners y position be the same I don't get a linear 'skew' but rather a warped one where the texture covering the top triangle (which makes up the quad) seems to get squashed while the bottom triangles texture looks normal. I can change UVs, any of the four points on the quad (but only in 2D space, it's orthographic projection anyway so 3D space won't matter much). So basically I'm trying to simulate perspective on a two dimensional quad in orthographic projection, any ideas? Is it even mathematically possible/feasible? ideally what I'd like is a situation where I can set an x/y rotation as well as a virtual z 'position' (which simulates z depth) through a function and see it internally calclate the positions/uvs to create the 3D effect. It seems like this should all be mathematical where a set of 2D transforms can be applied to each corner of the quad to simulate depth, I just don't know how to make it happen. I'd guess it requires trigonometry or something, I'm trying to crunch the math but not making much progress. here's what I mean: Top left is just the card, center is the card with a y rotation of X degrees and right most is a card with an x and y rotation of different degrees.

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• 3D coordinate of 2D point given camera and view plane

  - by Myx

  I wish to generate rays from the camera through the viewing plane. In order to do this, I need my camera position ("eye"), the up, right, and towards vectors (where towards is the vector from the camera in the direction of the object that the camera is looking at) and P, the point on the viewing plane. Once I have these, the ray that's generated is: ray = camera_eye + t*(P-camera_eye); where t is the distance along the ray (assume t = 1 for now). My question is, how do I obtain the 3D coordinates of point P given that it is located at position (i,j) on the viewing plane? Assume that the upper left and lower right corners of the viewing plane are given. NOTE: The viewing plane is not actually a plane in the sense that it doesn't extend infinitely in all directions. Rather, one may think of this plane as a widthxheight image. In the x direction, the range is 0--width and in the y direction the range is 0--height. I wish to find the 3D coordinate of the (i,j)th element, 0

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• Exporting WPF DataGrid to a text file in a nice looking format. Text file must be easy to read.

  - by Andrew

  Hi, Is there a simple way to export a WPF DataGrid to a text file and a .csv file? I've done some searching and can't see that there is a simple DataGrid method to do so. I have got something working (barely) by making use of the ItemsSource of the DataGrid. In my case, this is an array of structs. I do something with StreamWriters and StringBuilders (details available) and basically have: StringBuilder destination = new StringBuilder(); destination.Append(row.CreationDate); destination.Append(seperator); // seperator is '\t' or ',' for csv file destination.Append(row.ProcId); destination.Append(seperator); destination.Append(row.PartNumber); destination.Append(seperator); I do this for each struct in the array (in a loop). This works fine. The problem is that it's not easy to read the text file. The data can be of different lengths within the same column. I'd like to see something like: 2007-03-03 234238423823 823829923 2007-03-03 66 99 And of course, I get something like: 2007-03-03 234238423823 823829923 2007-03-03 66 99 It's not surprising giving that I'm using Tab delimiters, but I hope to do better. It certainly is easy to read in the DataGrid! I could of course have some logic to pad short values with spaces, but that seems quite messy. I thought there might be a better way. I also have a feeling that this is a common problem and one that has probably been solved before (hopefully within the .NET classes themselves). Thanks.

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• How to take screenshots of WPF applications in correct size and content

  - by Thomas W.

  I usually take screenshots of single windows via the built-in key combination Alt+Print. Unfortunately this does not work well for more and more applications - all of them are WPF applications. Usually the screen shots have at least one of the following properties: the screenshot is larger than expected and contains parts of the screen around the actual window the screenshot has the correct size but includes parts of other windows, e.g. the Windows task bar. Of course the task bar might be in front of the window, but taking screen shots of "normal" programs works fine. How do I take screenshots of WPF application which are correct in size and content? I'd like to avoid the extra effort of checking all the screenshots for correctness, reproducing the situation, taking them again in case of issues or repairing/faking them manually in any pixel manipulation program (e.g. Paint.NET). I observe this on Windows 7 x64 SP 1, all official updates installed, but it might apply to other Windows versions as well (not tested yet). .NET 4.5 is installed. The application itself might only need the built-in .NET 3.5.1. It's reproducible on a virtual machine with the same settings. Examples: Screenshot of an application running in maximized mode. The screen shot includes parts of the task bar. Screenshot of a progress dialog which is behind the task bar. The screenshot also includes the task bar, while it doesn't for non WPF applications.

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• Xaml not WPF

  - by xan

  I am interested in using Xaml with expression blend for creating user interfaces in an application. However, because of the limitations of the target architecture, I cannot use WPF or C#. So, what I am interested in is in any examples / existing projects or advice from anyone who has experiance of this technology on the use of Xaml in it's "Pure" form as a specification language not tied to WPF. Specific questions: 1) Is it possible to use Blend + Xaml without the WPF elements, or without C# backing classes? 2) Are there any other implementations of Xaml parsers etc. which use different architectures, and can they work with blend or similar tools. 3) Are there alternative editor / designer tools which can help in this situation? I am aware of the MyXaml and MycroXaml projects, and have found a lot of resources on the web about Xaml, but 99% of it relates directly to WPF. This is fine for understanding the concepts of Xaml, but doesn't help with the implimentation I need. Many thanks!

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• OpenGL ES and real world development

  - by Mark

  Hi Guys, I'm trying to learn OpenGL ES quickly (I know, I know, but these are the pressures that have been thrusted upon me) and I have been read around a fair bit, which lots of success at rendering basic models, some basic lighting and 'some' texturing success too. But this is CONSTANTLY the point at which all OpenGL ES tutorials end, they never say more of what a real life app may need. So I have a few questions that Im hoping arent too difficult. How do people get 3d models from their favorite 3d modeling tool into the iPhone/iPad application? I have seen a couple of blog posts where people have written some python scripts for tools like Blender which create .h files that you can use, is this what people seem to do everytime? Or do the "big" tooling suites (3DS, Maya, etc...) have exporting features? Say I have my model in a nice .h file, all the vertexes, texture points, etc.. are lined up, how to I make my model (say of a basic person) walk? Or to be more general, how do you animate "part" of a model (legs only, turn head, etc...)? Do they need to be a massive mash-up of many different tiny models, or can you pre-bake animations these days "into" models (somehow) Truely great 3D games for the iPhone are (im sure) unbelievably complex, but how do people (game dev firms) seem to manage that designer/developer workflow? Surely not all the animations, textures, etc... are done programatically. I hope these are not stupid questions, and in actual fact, my app that Im trying to investigate how to make is really quite simple, just a basic 3D model that I want to be able to pan/tilt around using touch. Has anyone ever done/seen anything like this that I might be able to read up on? Thanks for any help you can give, I appreciate all types of response big or small :) Cheers, Mark

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• WPF Databinding- Not your fathers databinding Part 1-3

  - by Shervin Shakibi

  As Promised here is my advanced databinding presentation from South Florida Code camp and also Orlando Code camp. you can find the demo files here. http://ssccinc.com/wpfdatabinding.zip Here is a quick description of the first demos, there will be 2 other Blogposting in the next few days getting into more advance databinding topics.   Example00 Here we have 3 textboxes, The first textbox mySourceElement Second textbox has a binding to mySourceElement and Path= Text <Binding ElementName="mySourceElement" Path="Text"  />   Third textbox is also bound to the Text property but we use inline Binding <TextBlock Text="{Binding ElementName=mySourceElement,Path=Text }" Grid.Row="2" /> Here is the entire XAML     <Grid  >           <Grid.RowDefinitions >             <RowDefinition Height="*" />             <RowDefinition Height="*" />             <RowDefinition Height="*" />         </Grid.RowDefinitions>         <TextBox Name="mySourceElement" Grid.Row="0"                  TextChanged="mySourceElement_TextChanged">Hello Orlnado</TextBox>         <TextBlock Grid.Row="1">                        <TextBlock.Text>                 <Binding ElementName="mySourceElement" Path="Text"  />             </TextBlock.Text>         </TextBlock>         <TextBlock Text="{Binding ElementName=mySourceElement,Path=Text }" Grid.Row="2" />     </Grid> </Window> Example01 we have a slider control, then we have two textboxes bound to the value property of the slider. one has its text property bound, the second has its fontsize property bound. <Grid>      <Grid.RowDefinitions >          <RowDefinition Height="40px" />          <RowDefinition Height="40px" />          <RowDefinition Height="*" />      </Grid.RowDefinitions>      <Slider Name="fontSizeSlider" Minimum="5" Maximum="100"              Value="10" Grid.Row="0" />      <TextBox Name="SizeTextBox"                    Text="{Binding ElementName=fontSizeSlider, Path=Value}" Grid.Row="1"/>      <TextBlock Text="Example 01"                 FontSize="{Binding ElementName=SizeTextBox,  Path=Text}"  Grid.Row="2"/> </Grid> Example02 very much like the previous example but it also has a font dropdown <Grid>      <Grid.RowDefinitions >          <RowDefinition Height="20px" />          <RowDefinition Height="40px" />          <RowDefinition Height="40px" />          <RowDefinition Height="*" />      </Grid.RowDefinitions>      <ComboBox Name="FontNameList" SelectedIndex="0" Grid.Row="0">          <ComboBoxItem Content="Arial" />          <ComboBoxItem Content="Calibri" />          <ComboBoxItem Content="Times New Roman" />          <ComboBoxItem Content="Verdana" />      </ComboBox>      <Slider Name="fontSizeSlider" Minimum="5" Maximum="100" Value="10" Grid.Row="1" />      <TextBox Name="SizeTextBox"      Text="{Binding ElementName=fontSizeSlider, Path=Value}" Grid.Row="2"/>      <TextBlock Text="Example 01" FontFamily="{Binding ElementName=FontNameList, Path=Text}"                 FontSize="{Binding ElementName=SizeTextBox,  Path=Text}"  Grid.Row="3"/> </Grid> Example03 In this example we bind to an object Employee.cs Notice we added a directive to our xaml which is clr-namespace and the namespace for our employee Class xmlns:local="clr-namespace:Example03" In Our windows Resources we create an instance of our object <Window.Resources>     <local:Employee x:Key="MyEmployee" EmployeeNumber="145"                     FirstName="John"                     LastName="Doe"                     Department="Product Development"                     Title="QA Manager" /> </Window.Resources> then we bind our container to the that instance of the data <Grid DataContext="{StaticResource MyEmployee}">         <Grid.RowDefinitions>             <RowDefinition Height="*" />             <RowDefinition Height="*" />             <RowDefinition Height="*" />             <RowDefinition Height="*" />             <RowDefinition Height="*" />         </Grid.RowDefinitions>         <Grid.ColumnDefinitions >             <ColumnDefinition Width="130px" />             <ColumnDefinition Width="178*" />         </Grid.ColumnDefinitions>     </Grid> and Finally we have textboxes that will bind to that textbox         <Label Grid.Row="0" Grid.Column="0">Employee Number</Label>         <TextBox Grid.Row="0" Grid.Column="1" Text="{Binding Path=EmployeeNumber}"></TextBox>         <Label Grid.Row="1" Grid.Column="0">First Name</Label>         <TextBox Grid.Row="1" Grid.Column="1" Text="{Binding Path=FirstName}"></TextBox>         <Label Grid.Row="2" Grid.Column="0">Last Name</Label>         <TextBox Grid.Row="2" Grid.Column="1" Text="{Binding Path=LastName}" />         <Label Grid.Row="3" Grid.Column="0">Title</Label>         <TextBox Grid.Row="3" Grid.Column="1" Text="{Binding Path=Title}"></TextBox>         <Label Grid.Row="4" Grid.Column="0">Department</Label>         <TextBox Grid.Row="4" Grid.Column="1" Text="{Binding Path=Department}" />

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• Baboon Framework : A revolutionary WPF framework that will save you time and effort

  This is true code, what you say

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• How To: Filter as you type RadGridView inside RadComboBox for WPF and Silverlight

  Ive made small example on how to place RadGridView inside editable RadComboBox and filter the grid items as you type in the combo:   The easiest way to place any UI element in RadComboBox is to create single RadComboBoxItem and define desired Template: <telerikInput:RadComboBox Text="{Binding Text, Mode=TwoWay}" IsEditable="True" Height="25" Width="200"> <telerikInput:RadComboBox.Items> <telerikInput:RadComboBoxItem> <telerikInput:RadComboBoxItem.Template> <ControlTemplate> <telerikGrid:RadGridView x:Name="RadGridView1" ShowGroupPanel="False" CanUserFreezeColumns="False" RowIndicatorVisibility="Collapsed" IsReadOnly="True" IsFilteringAllowed="False" ItemsSource="{Binding Items}" Width="200" Height="150" SelectedItem="{Binding SelectedItem, Mode=TwoWay}"> </telerikGrid:RadGridView> </ControlTemplate> </telerikInput:RadComboBoxItem.Template> </telerikInput:RadComboBoxItem> </telerikInput:RadComboBox.Items> </telerikInput:RadComboBox> Now you can create small view model and bind ...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• WPF Parent Window shading using Pixel Shaders

  This article discusses using Pixel Shaders to shade the main window when a dialog is showing.

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• 3d Studio Max and 2+CPUs - Core limit ?

  - by FreekOne

  Hi guys, I am scouting for parts to put in a new machine, and in the process, while looking at different benchmarks I stumbled upon this benchmark and it got me a bit worried. Quote form it: Noticably absent from this review is an old-time favorite, 3ds Max. I did attempt to run our custom 3ds Max benchmark on both the 2009 and 2010 versions of the software, but the application would simply not load on the Westmere box with hyper-threading enabled. Evidently Autodesk didn't plan far enough ahead to write their software for more than 16 threads. Once there is an update that addresses this issue, I will happily add 3ds Max back into the benchmarking mix. Since I was looking at dual hexa-core Xeons (x5650), that would put my future machine at 24 logical cores which (duh) is well over 16 cores and since I'm mostly building this for 3DS Max work, you can see how this would seriously spoil my plans. I tried looking for additional information on this potential issue, but the above article seems to be the only one who mentions it. Could anyone who has access to a 16 core machine or an in-depth knowledge about 3DS Max please confirm this ? Any help would be much appreciated !

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• Spirograph Shapes: WPF Bezier shapes from math formulae

  A collection of shapes: Epicycloids, Epitrochoids, Hypocycloids, Hypotrochoids, Farris Wheels, Lissajous Curves and Rose Curves

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• WPF MenuItem hiding (2 replies)

  Hi, I would like to hide selected MenuItem on Delete key press without closing the menu. My markup is: Menu MenuItem Header &quot;Menu&quot; MenuItem Header &quot;First&quot; KeyDown &quot;MenuItem KeyDown&quot;/ MenuItem Header &quot;Second&quot; KeyDown &quot;MenuItem KeyDown&quot;/ MenuItem Header &quot;Third&quot; KeyDown &quot;MenuItem KeyDown&quot;/ /MenuItem /Menu where event handler is: private void MenuItem KeyDown(object sender, KeyEventArgs e) { if (e.Key...

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• WPF PropertyGrid - MVVM techniques

  How to build a multicolumn ListView that selects cell templates based on the row data type; and how to create a ViewModel on the fly for each cell template.

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• WPF : Showing you how to use PRISM in a very unlike PRISM way

  Showcasing how to use PRISMs regions outside of PRISM

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• Vmware server - 3d graphics upgrade like WKS 7 and vmware player

  - by jimbo45

  Hi all Anybody have an idea as to when VMWARE SERVER will have an upgrade to support 3-d graphics etc. I have created some W7 VM's under WKS7 and an upgraded vmware tools -- the W7 VM's run full aero etc. I believe that vmware tools and graphics for VM's running under vmware server are at the WKS 6.5 level -- hence problems can occur. Any info on an upgrade. Cheers jimbo

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• Dealing with transformations in WPF: PartII-Custom and advanced 2D transformations

  In a previous article we've discovered the different transformation modes. In this article, we continue discovering the transformations.

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• Implementing logical paging with RadDataPager for WPF and Silverlight

  Following the great series about RadDataPager started by Rossen and Pavel, today I’m going to show you how to implement logical paging. We are going to implement alphabetical paging similar to this ASP.NET AJAX Grid Demo. As you may already know, the key to the heart of the RadDataPager is the IPagedCollectionView interface. You can create your own implementations of this interface and implement any custom logic for paging you want. This is exactly what we are going to do in this article. Introducing PagedCollectionViewBase and LogicallyPagedCollectionView<T> If you have looked at IPagedCollectionView interface you may have found out that it is not a trivial interface to implement. It has 5 methods, 6 properties and 2 events – total number of members to implement 13. To ease any further implementation of the paging interface we are going to create a base class that will have most of the ...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• Bitmap Effects In WPF - Part III

  In previous article we saw remaining three effects DropShadow, Bevel and Emboss. In this article we will see how to group effects, and we will see how we can achieve the effects with triggers.

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• WPF Applications &ndash; Handling the Unhandled

  - by David Totzke

  Instead of just letting your application crash, you can attach a method to the DispatcherUnhandledExceptionEventHandler and one to the AppDomain.Current.UnhandledException.  You wire these up in the code behind of your application which by default is App.xaml.cs.  You can log these errors or throw up a message Don Box and tell the user what happened.  Then you shut down the app gracefully.  You shut it down because something bad happened that you weren’t expecting and at this point there is no guarantee as to the state of the stack or memory or anything really.  All bets are off. If, on the other hand, the method for the UnhandledException is empty and the method for the DispatcherUnhandledEventHandler ends up in a call to a method called LogError() and the LogError() method is FUCKING EMPTY, and you just swallow the exceptions and keep on running, then, not so much.  I spent nearly a day trying to track down a bug that would have been obvious had something been logged or if it just crashed.  It’s my own fault I suppose.  I knew these were hooked up.  I just never suspected that there wouldn’t be any implementation at all.  Live and learn. Customs Man at Heathrow: Anything to declare, Sir? Jekyll and Hyde: Man has not evolved an inch from the slime that spawned him. Customs Man at Heathrow: Very Good, Sir. I tend to agree. Dave Just because I can…

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• WPF MenuItem hiding (2 replies)

  Hi, I would like to hide selected MenuItem on Delete key press without closing the menu. My markup is: Menu MenuItem Header &quot;Menu&quot; MenuItem Header &quot;First&quot; KeyDown &quot;MenuItem KeyDown&quot;/ MenuItem Header &quot;Second&quot; KeyDown &quot;MenuItem KeyDown&quot;/ MenuItem Header &quot;Third&quot; KeyDown &quot;MenuItem KeyDown&quot;/ /MenuItem /Menu where event handler is: private void MenuItem KeyDown(object sender, KeyEventArgs e) { if (e.Key...

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• Why use 3d matrix and camera in 2D world for 2d geometric figures?

  - by Navy Seal

  I'm working in XNA on a 2d isometric world/game and I'm using DrawUserPrimitives to draw some geometric figures... I saw some tutorials about creating dynamic shadows but I didn't understood why they use a "3d" matrix to control the transformations since the figure I'm drawing is in 2d perspective. I know I'm drawing a 2d figure in 3d but I still can't understand if I really need to work with the matrix. Is there any advantage in using a 3d Matrix to control camera and view? Any reason why I can't just update my vertex's positions by using a regular method since the view is always the same... And since I want to work only with single figures, won't this cause all the geometric figures have the same transformations simultaneously? To understand better what I mean here's a video http://www.youtube.com/watch?v=LjvsGHXaGEA&feature=player_embedded

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• How to play an MKV 3D side-by-side video?

  - by djechelon

  I have a video in Matroska format (MKV, file extension .mkv), 3D half-SBS, where the 1280x720 frame shows the left-eye frame on the left and the right-eye frame on the right. I don't have a 3DTV, but I have NVidia 3D Vision: I tried to open it with PowerDVD 10 with no result (program hangs). With the same PowerDVD, I tried to play the Avatar 3D trailer downloaded from YouTube (MP4 format), but it now shows it the two frames. PowerDVD 10 is advertised to support 3D and 3D Vision. Why can't I play these videos? NVidia Stereoscopic player plays the Avatar trailer fine, but it doesn't support MKV.

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• Commands in WPF - Part IV

  In Part III of this article series; we have seen how Input Binding is helpful. In this article we will explore on Command Objects and Command Types.

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