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MOGRE. Introduction. At the end of this lecture you will be able to: Understand ways of using OGRE in languages other than C++ Understand what MOGRE is Understand the advantages and disadvantages of using MOGRE Understand the process of how to install and setup MOGRE

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Mogre

MOGRE


Introduction

Introduction

  • At the end of this lecture you will be able to:

    • Understand ways of using OGRE in languages other than C++

    • Understand what MOGRE is

    • Understand the advantages and disadvantages of using MOGRE

    • Understand the process of how to install and setup MOGRE

    • Learn how to embed MOGRE into a Windows Form

    • Learn how to perform basic input processing in MOGRE


References

References

  • http://www.ogre3d.org/wiki/index.php/MOGRE


Using ogre in toolset dev

Using OGRE in Toolset Dev

  • Under Windows, OGRE and it’s plugins are written and built as a set of C++ static import and dynamic linked libraries

  • To use it natively, the client code needs to be also written in C++

  • This is optimal for games programming where the power and speed of C++ is essential


Using ogre in toolset dev1

Using OGRE in Toolset Dev

  • For toolset development, performance is not so much a high priority compared to fast development time

  • Development in C++ usually incurs longer development times (due to memory management, debugging, syntactical issues, etc.)

  • What would be ideal would be a means of using OGRE and accessing all it’s the functionality within another programming language which may better support RAD for the programming team

  • Reflective of industry game/graphics engines


Ogre for other languages

OGRE for Other Languages

  • Axiom

    • C# port of OGRE

  • MOGRE

    • .NET wrapper for OGRE, with porting of some elements

  • OgreDotNet

    • Another .NET wrapper, though support and maintenance has lapsed since OGRE release 1.2

  • PyOgre

    • Binding for Python

  • Ogre4j

    • Bindings for Java


What is mogre

What is MOGRE?

  • Stands for Managed OGRE

    • .NET 2.0 wrapper for the OGRE

  • Allows the OGRE rendering engine to be used by .NET programming languages

    • C#, VB.NET, Managed C++ etc.

  • Also wraps the Newton physics library with MogreNewt.

  • Currently supports OGRE Eihort 1.4.0 (Final)


Benefits of mogre

Benefits of MOGRE

  • Application code can be developed in .NET languages

    • Can make use of all the in-built windows GUI forms and controls provided as part of the .NET framework

    • Garbage collection

    • Generally faster to time develop – aligned with Rapid Applications Development paradigm


Benefits of mogre1

Benefits of MOGRE

  • OGRE use with .NET languages, getting all associated benefits of the .NET framework.

  • Mogre releases are very responsive to OGRE code updates ( compared to a full .NET port of OGRE – like AXIOM ), as the majority of the Mogre wrapper classes can be auto-generated from the OGRE source

  • To date, most proven responsiveness to changes in OGRE


Benefits of mogre2

Benefits of MOGRE

  • Clients know that, under the hood, they are still mainly getting OGRE, rather than a rewrite ( with possible new bugs introduced, etc )

  • Benefit and tradeoff profile is perfectly suited to game toolset development – where performance speed can be sacrificed for faster time to develop and responsiveness to change

  • .NET attractive to future direction of games industry


Disadvantages of mogre

Disadvantages of MOGRE

  • Performance will not be optimal compared to developing in purely unmanaged languages like C/C++

  • The wrapper objects introduces an extra layer of processing to delegate calls to OGRE – a performance hit

  • The OGRE source is modified, meaning that the OGRE code cannot be used as-is and all Mogre updates will also have it’s own special OGRE release ( with the appropriate source modifications ) coupled with it


Disadvantages of mogre1

Disadvantages of MOGRE

  • The original creator and maintainer will be leaving the project May 2007 ( however, other people have offered to step up and take over the role )


How mogre works

How MOGRE Works

  • Set of managed C++.NET wrapper classes

  • Wrapper classes are created for every underlying C++ OGRE class types

  • These wrapper classes attempt to expose the same C++ interface supported by the underlying classes, to encourage consistency

  • Additional .NET features are supported:

    • E.g. properties are used instead of get/set accessors

  • Under the hood, these wrapper objects delegate all calls to an internal, unmanaged OGRE C++ object


How mogre works1

How MOGRE Works

  • MOGRE is built into a single .dll assembly which is included as a reference in all client .NET projects

  • All classes and types are contained within the MOGRE namespace

  • From a programming clients point of view, calls are simply made using a .NET interface.

  • The author of MOGRE uses a custom in-house tool to auto-generate the wrapper code from original OGRE source


How mogre works2

How MOGRE Works

  • MOGRE actually modifies the OGRE source code, so it is not a pure “layered” wrapper as such

  • These code modifications efficiently deal with the management of the internal OGRE object, promoting faster access

  • External OGRE plugins will need to be recompiled with the modified Mogre interfaces in order to be used successfully within Mogre

  • For speed benefits, some elements of OGRE are totally rewritten in C++.NET rather than wrapped, mainly many of the maths classes


Mogre vs ogre

MOGRE vs OGRE

  • MOGRE methods use PascalCase rather than camelCase

  • OGRE’s get…(), set…(), and is…() methods are converted to properties under MOGRE

  • Properties with the first letter being in lower case indicates not an accessor, but a public exposure of the underlying class member


Mogre vs ogre1

MOGRE vs OGRE

  • In place of OGRE’s listener functions, MOGRE uses .NET events and delegate functions

    mRoot.FrameStarted += new FrameListener.FrameStartedHandler(Skeletal_FrameStarted);

    • FrameStarted: the event

    • FrameListener.FrameStartedHandler: the delegate( for naming clarification )

    • Skeletal_FrameStarted: the function


Mogre installation

MOGRE Installation

  • Download the MOGRE 0.2.0 + OGRE 1.4.0 SDK installer from the MOGRE Wiki page

    • http://www.ogre3d.org/wiki/index.php/MOGRE

  • Run the Installer

  • Can specify a different install directory if desired (OGRE_HOME environment variable will be appropriately set)

  • Ensure the we have Visual Studio 8 SP1 installed

  • New Dlls for MOGRE:

    • Mogre.dll

    • MogreNewt.dll

  • These need to be copied to the project’s output/working directory where all the existing OGRE dlls are


Setting up mogre project

Setting Up MOGRE Project

  • Add Reference to Mogre.dll

  • Two alternatives for setting the output location

    • Use the Mogre SDKs output path

      • Add the following to Properties->Build Events->post build event:

        copy "$(TargetPath)" "%OGRE_HOME%\bin\$(ConfigurationName)“

    • Create our own output directory:

      • Ensure that all the required .dll files are copied

      • Ensure all the paths in the .cfg files are correct


Executing mogre projects

Executing MOGRE Projects

  • Two alternatives for how to execute MOGRE Projects:

    • Directly navigate to the output directory and run the compiled .exe file

    • To run ( and debug) within Visual Studio’s IDE:

      • Point Properties->Debug->Start external programto the output .exe ( where the assocated .dlls and .cfg files are )

      • Point Properties->Debug- >Working directoryto the path where the output .exe and .dlls and .cfg files are located


Mogreframework

MogreFramework

  • Similar to the ExampleApplication framework provided and used for the OGRE samples

  • Written in C# and supports MOGRE

  • Usage is very similar

  • Creates its own window so not suitable out-of-the box for Win Forms integration


Mogre and win forms

MOGRE and Win Forms

  • Create a C# Windows Form in Visual Studio

  • During Form intialisation, perform the usual OGRE setup sequence, up to the creation of the render window, i.e.

    • Create root

    • Load config file

    • Add resource locations

    • Set render system


Mogre and win forms1

MOGRE and Win Forms

  • We need to create a render window manually to get MOGRE to embed itself into the form rather than create it’s own separate window – as in the MogreFramework

    mRoot.Initialise(false, "Main Ogre Window");

    NameValuePairList misc = new NameValuePairList();

    misc["externalWindowHandle"] = Handle.ToString();

    RenderWindow window = mRoot.CreateRenderWindow("Main RenderWindow", 800, 600, false, misc);


Mogre and win forms2

MOGRE and Win Forms

  • MOGRE can be embedded to controls as well as forms

  • Multiple render windows can be created and attached to independent controls / forms

  • The rest of the setup process can then proceed, ie:

    • Initialise resource groups

    • Create scenemanager

    • Create camera

    • Create viewport

    • Create scene

    • Position camera

    • Etc…


Mogre and win forms3

MOGRE and Win Forms

  • Other considerations:

    • Disposing of the MOGRE root object when the form disposes

      • Create an event handler and attach to .Disposed event of the form

      • Call m_Root.Dispose();

    • Resizing MOGRE window when the form is resized

      • Create an event handler and attach to .Resize event of form

      • Call m_Window.WindowMovedOrResized();


Mogre and win forms4

MOGRE and Win Forms

  • The render loop:

    Show();

    while (mRoot != null && mRoot.RenderOneFrame())

    {

    Application.DoEvents();

    }


Mogre and win froms

MOGRE and Win Froms

  • Refer to:

    http://www.ogre3d.org/tikiwiki/Mogre+Basic+Tutorial+6

    for full code listing


Keyboard and mouse input

Keyboard and Mouse Input

  • For basic, buffered keyboard and mouse input, the .NET Framework’s input system can be used

  • Use the appropriate Key and Mouse events and attach corresponding Key and Mouse Input Handlers

    this.KeyDown += new KeyEventHandler(KeyDownHandler);

    void KeyDownHandler(object sender, KeyEventArgs e)

    {

    switch (e.KeyCode)

    {

    case Keys.I:

    etc..


Keyboard and mouse input1

Keyboard and Mouse Input

this.MouseDown += new MouseEventHandler(MouseDownHandler);

void MouseDownHandler(object sender, MouseEventArgs e)

{

if (e.Button == MouseButtons.Middle)

etc..


Keyboard and mouse input2

Keyboard and Mouse Input

  • Another advantage of using MOGRE and .NET is that individual forms and controls can be given individual input handlers

  • This allows easier implementation of the multiple viewport type presentation typical of scene editors

  • e.g. when the mouse is dragged whilst in the perspective viewport, only the scene in that viewport is rotated, panned, zoomed etc.


Lecture review

Lecture Review

  • Understand ways of using OGRE in languages other than C++

  • Understand what MOGRE is

  • Understand the advantages and disadvantages of using MOGRE

  • Understand the process of how to install and setup MOGRE

  • Learn how to embed MOGRE into a Windows Form

  • Learn how to perform basic input processing in MOGRE


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