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  <title>jMonkeyEngine  | Sgold interviews Daniel Perano</title>
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<meta name="twitter:description" content="stephengold Thank you for agreeing to be interviewed.
First question: Do you remember when you first encountered JMonkeyEngine?
What was your first impression?
danielperano I started learning jME back in the 3.0 days, as I recall,
and I was impressed with the features it offered.
The scene-graph control and appstate design made a lot of sense to me &mdash;"/>

  <meta property="og:title" content="Sgold interviews Daniel Perano" />
<meta property="og:description" content="stephengold Thank you for agreeing to be interviewed.
First question: Do you remember when you first encountered JMonkeyEngine?
What was your first impression?
danielperano I started learning jME back in the 3.0 days, as I recall,
and I was impressed with the features it offered.
The scene-graph control and appstate design made a lot of sense to me &mdash;" />
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<meta property="article:published_time" content="2020-02-25T18:00:00+00:00" />
<meta property="article:modified_time" content="2020-02-25T18:00:00+00:00" />


  <meta itemprop="name" content="Sgold interviews Daniel Perano">
<meta itemprop="description" content="stephengold Thank you for agreeing to be interviewed.
First question: Do you remember when you first encountered JMonkeyEngine?
What was your first impression?
danielperano I started learning jME back in the 3.0 days, as I recall,
and I was impressed with the features it offered.
The scene-graph control and appstate design made a lot of sense to me &mdash;"><meta itemprop="datePublished" content="2020-02-25T18:00:00+00:00" />
<meta itemprop="dateModified" content="2020-02-25T18:00:00+00:00" />
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      jMonkeyEngine is a modern developer friendly game engine written primarily in Java. 
      <br />
      Its minimalistic and code first approach makes it perfect for developers who want the support of a game engine
      while retaining full control over their code with the ability to extend and adapt the engine to their workflow.
      
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      <h2><i class="far fa-images" ></i> Skullstone powered by jMonkeyEngine</h2>
      
      Skullstone – a retro styled grid-based dungeon crawler RPG inspired by the good old titles such as Dungeon Master, Stonekeep, Eye of Beholder and many other classics.
In a few words – a party of … 
      
      <br />
      <a class="readMore" href="/showcase/skullstone/#showcase">See game page </a> 
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            <a href="/blog/interview-danielp/">Sgold interviews Daniel Perano</a></h1>
            <div class="content">
                <span>
                <p><figure class="githubUser inline " github-user="stephengold">
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</figure> <br>
Thank you for agreeing to be interviewed.</p>
<p>First question: Do you remember when you first encountered JMonkeyEngine?<br>
What was your first impression?</p>
<p><figure class="githubUser inline " github-user="danielperano">
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</figure> I started learning jME back in the 3.0 days, as I recall,<br>
and I was impressed with the features it offered.<br>
The scene-graph control and appstate design made a lot of sense to me &mdash;<br>
at the time both were novel concepts.</p>
<p>Not long after that, I adopted jME for a project called “OpenWorld.”</p>
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</figure> <br>
What sort of project was it?</p>
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</figure> OpenWorld was the precursor to MyWorld &mdash;<br>
a platform for real-time, 3-D social virtual worlds and MMO games.</p>
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</figure> <br>
What got you interested in social virtual worlds?</p>
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</figure> I first heard of them from<br>
a magazine article about Second Life, over a decade ago.<br>
I was fascinated, and despite being underage<br>
(accounts were restricted to users 18 and over), I created an account.</p>
<p>Since I was underage my adventures there did not last long, but<br>
I was hooked from the start.<br>
It was like a game, but there were so many things to do and places to explore,<br>
and the built-in creation system blew my mind.</p>
<p>A couple years later, I discovered OpenSimulator,<br>
an open-source server that’s compatible with Second Life clients (viewers).<br>
Since then, I’ve been a member of various OpenSimulator virtual worlds (or grids, as they’re called).</p>
<p>During my second year in OpenSimulator, I began to keenly notice<br>
some limitations that OpenSimulator inherited from Second Life.<br>
Compared to multi-player games, virtual worlds always felt slow and bloated,<br>
and the architecture was fundamentally limiting.</p>
<p>At that point I had the idea that grew into MyWorld:<br>
apply multiplayer game technology to social virtual worlds.<br>
Later on, I realized that a social virtual-world platform<br>
could also be a powerful MMO gaming platform, and<br>
since then I’ve worked towards the dual goal of supporting<br>
social virtual worlds and MMO games as first-class citizens on MyWorld.</p>
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</figure> <br>
How many people are working on MyWorld?</p>
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</figure> We have three people on the project.<br>
Right now I’m the sole developer &mdash;<br>
the other two handle business management,<br>
social media, and aesthetics (art and design).</p>
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</figure> <br>
How is the project funded?</p>
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</figure> We’re fully self-funded: no investor or venture-capital backing.<br>
We see this as an advantage, for two reasons:</p>
<ol>
<li>We’re not beholden to shareholders,<br>
so we’re free to make decisions that bring the best experience to our users.</li>
<li>Our runway is infinitely long &mdash; we have no pressure to grow rapidly to avoid bankruptcy.<br>
We can grow organically and sustainably.</li>
</ol>
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</figure> <br>
When’s the next release of MyWorld due out?</p>
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</figure> Our first alpha/preview release<br>
will come out around the end of March of this year (2020).</p>
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</figure> <br>
What features will it provide?</p>
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</figure> The feature set will depend on what we have time to finish.<br>
Dynamic asset delivery/loading, the entity system, and scripting<br>
are in pretty good shape,<br>
but the user interface still needs work<br>
and there are many small “detail features” that need attention.</p>
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</figure> <br>
In the long run, what will differentiate MyWorld from other virtual worlds?<br>
Specifically, how would you compare it to Minecraft and Second Life?</p>
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</figure> Unlike Minecraft, MyWorld is not a game itself &mdash;<br>
it’s a platform that supports dynamic content creation and scripting,<br>
and unlike games more generally, MyWorld provides first-class support<br>
for uploading 3D models, textures, audio, etcetera<br>
and distributing them to clients on an as-needed basis.<br>
It also has a professional-grade scripting language you can use<br>
to add custom behavior to your creations.</p>
<p>Unlike current-generation virtual worlds,<br>
MyWorld was designed from Day One to satisfy<br>
the performance requirements of multiplayer action games.<br>
This means that exploring a virtual world can have the same fast,<br>
fluid feel as playing a well-designed multiplayer game.</p>
<p>Another difference is that we support scripting on both client and server,<br>
allowing scripted effects and latency-elimination techniques<br>
that are impossible in current virtual worlds.</p>
<p>In addition, our internal systems can be extended via plugins<br>
that can integrate into the entity system and<br>
host or call HTTP endpoints (for custom REST APIs, for example).<br>
Plugins can even extend the core network protocol<br>
with jME’s fast, intuitive, and efficient RMI implementation.</p>
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</figure> <br>
What’s the financial model? Will the client be freely downloadable?<br>
Will there be paid subscriptions? Free-to-play accounts?</p>
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</figure> Our vision for MyWorld has always been to release it open-source,<br>
so the client will always be free to download and use, as will the core server.<br>
We may eventually release some commercial plugins for professional use,<br>
but these would be extensions to the core server,<br>
not permanently built-in proprietary code.</p>
<p>In a project like MyWorld,<br>
there are many opportunities to provide value to users,<br>
so there are many potential revenue streams.<br>
Initially we’re looking at a revenue model similar to Second Life:<br>
users can rent space in the virtual world to build homes,<br>
businesses, workshops, etcetera.<br>
We may also introduce a subscription model that offers<br>
extra benefits to heavy users.</p>
<p>We’re also investigating how we can monetize<br>
by offering professional hosting and support services to game developers<br>
and those interested in running MyWorld servers.</p>
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</figure> <br>
I’ve heard that Second Life has its own currency.<br>
Do you have plans in that area?</p>
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</figure> While MyWorld needs a virtual currency to effectively operate,<br>
issuing one ourselves is not currently a viable choice for a couple of reasons:</p>
<ol>
<li>
<p>Issuing in-house currency is a large financial liability &mdash;<br>
there are many ways to destabilize an economy, virtual or otherwise,<br>
that are largely or completely outside the control of the currency issuer,<br>
which would present a risk both to us and our users.</p>
</li>
<li>
<p>Governments have begun regulating virtual currencies,<br>
making it expensive and difficult to issue them.</p>
</li>
</ol>
<p>Fortunately, we’re not the only ones with this need<br>
and there are several good virtual currency services,<br>
some of which allow the same currency to be used across many games or virtual worlds.</p>
<p>So yes, we will have a virtual currency,<br>
but we’re not planning on issuing it ourselves.</p>
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</figure> <br>
You mentioned earlier that Second Life was age-restricted.<br>
Will MyWorld have similar restrictions?</p>
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</figure> Initially yes, unfortunately.<br>
Allowing minors requires extra legal compliance<br>
and stringent moderation of content and user interactions.</p>
<p>I don’t see this as a notable limitation, especially early on.<br>
Most of our initial user base will be developers and creators,<br>
not general users,<br>
so I expect the overwhelming majority of interest to be coming from adults.</p>
<p>I want to allow minors to access at least some areas within MyWorld<br>
as soon as it makes sense for us as an organization and community,<br>
but for now we need to focus on the technical aspects.</p>
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</figure> <br>
Does MyWorld use JMonkeyEngine for the client, the server, or both?</p>
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</figure> The client is a typical jME application &mdash;<br>
AppStates tie MyWorld-specific libraries (such as our in-house entity system)<br>
to other systems and the scene graph.</p>
<p>The server uses jME’s network stack,<br>
and we’re transitioning from jME’s physics to Minie, but that’s about all.<br>
The server’s systems and heartbeat/event dispatch loop are all custom &mdash;<br>
we don’t use jME’s application structure serverside.</p>
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</figure> <br>
What technologies does MyWorld use besides JMonkeyEngine?</p>
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</figure> It uses JavaFX, Lemur, Chipmunk (our in-house scripting language),<br>
Jetty (an embedded HTTP server), and CockroachDB (a distributed SQL database).</p>
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</figure> <br>
What prompted you to create Chipmunk?<br>
What other scripting languages did you consider?</p>
<p><figure class="githubUser inline " github-user="danielperano">
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</figure> Chipmunk was born out of necessity.</p>
<p>Like Second Life,<br>
MyWorld allows content creators to script anything they create.<br>
Scripting can include physics, movement, particle/sound/animation effects,<br>
HTTP calls, etcetera.</p>
<p>The problems here are security and resource use.<br>
Since anyone with creation privileges can upload scripts to a server<br>
(and scripts can also run client side), sandboxing is a must.</p>
<p>My first choice for scripting was Groovy.<br>
It’s a powerful, well-known language with many features,<br>
and the compiler supports AST transformations for customizing compiled code.<br>
I spent a great deal of time pursuing this route,<br>
but the shoe always pinched in the same spots: preemption and checkpointing.</p>
<p>Preemption means that the script engine can stop a running script at any time.<br>
This is necessary to ensure that misbehaving (or resource-intensive) scripts<br>
don’t overuse CPU resources.<br>
Preemption is also necessary for checkpointing:<br>
freezing a script so it can be persisted to disk or sent to another server.</p>
<p>Java was not designed for preemption.<br>
Every mechanism I could think of to fit preemption support<br>
into Java’s compiled bytecode came with substantial overhead and other nasty limitations.</p>
<p>I also experimented with an assembly-like language for scripting,<br>
but it was too difficult to read to be suitable for anything more than trivial scripts.</p>
<p>I designed Chipmunk to fit a unique place in the language spectrum &mdash;<br>
easy for a first-time programmer to pick up,<br>
but powerful enough for an experienced developer to hit the ground running.<br>
For example, classes declare state that’s shared between all instances<br>
via the “shared” keyword,<br>
which is semantically identical to Java’s “static” keyword,<br>
but expresses the concept in terms that make intuitive sense<br>
to inexperienced programmers.</p>
<p>In terms of features, Chipmunk supports modules, classes, polymorphism,<br>
first-class functions, anonymous (lambda) functions, exceptions,<br>
and dynamic typing.</p>
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</figure> <br>
Chipmunk sounds like it might have many uses.</p>
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</figure> I hope so! I’m looking forward to seeing what else it’s used for.</p>
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</figure> <br>
Is there any published documentation for it?<br>
Is it open-source?</p>
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</figure> Chipmunk is developed separately from MyWorld and will be released<br>
open-source as soon as we’ve finalized the v1.0 language spec<br>
and finished implementing the standard library.</p>
<p>The main language features are functional, but it needs more attention<br>
on things like string manipulation, collection operations, and libraries.</p>
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</figure> <br>
Part of the appeal of an open world, I think,<br>
is having a place to exhibit digital creations.</p>
<p>What skills/tools would someone need to create and upload a 3-D model?<br>
Do you envision people using Blender 3D?</p>
<p>What audio formats will MyWorld support?</p>
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</figure> MyWorld is built around the assumption that users will create digital content.<br>
One of the first things I wrote was the dynamic asset upload/download mechanism.</p>
<p>Our initial creation pipeline is based around the GLTF format.<br>
Thanks to jME’s GLTF importer, most modern GLTF files should import seamlessly.<br>
Our primary interest in external tools is Blender 3D,<br>
but anything that exports to GLTF should do fine.</p>
<p>Later on, we plan to support in-world creation via constructive solid geometry<br>
with procedural extensions, as a supplement to the GLTF pipeline.</p>
<p>Any audio format supported by jME (OGG &amp; WAV in particular)<br>
can be opened by the client for upload.<br>
Streaming media can be in any format supported by JavaFX’s media framework.</p>
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</figure> <br>
If someone wants to develop games for MyWorld, where should they begin?<br>
Is there an e-mail list for announcements?<br>
A website they should monitor?<br>
A chatroom they should join?</p>
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</figure> The best place to go is our <a href="https://discordapp.com/invite/WccnrWg">Discord server</a>.<br>
We have an active community there,<br>
and we often discuss planned or requested features.<br>
It’s also the first place we share development updates<br>
and news about the project.<br>
For anyone wishing to participate in the alpha-test release,<br>
this is the place to be.</p>
<p>Our <a href="https://www.facebook.com/MyWorld-LLC-228751528045088">Facebook</a><br>
and <a href="https://twitter.com/MyWorldLLC">Twitter</a> pages<br>
cover major news items and announcements,<br>
and liking/following us there helps us get the word out to more people!</p>
<p>For general project information, blog posts, and press releases,<br>
the <a href="https://myworldvw.com/">MyWorld website</a> is the place to go.<br>
We archive the notes from our monthly “MyWorld Meetup” sessions on the blog &mdash;<br>
these are a great resource for finding out details about the project.</p>
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</figure> <br>
I’ve run out of questions.<br>
Unless there’s something more you’d like to discuss, let’s wrap this up.</p>
<p>Thank you very much for your detailed answers<br>
and all the time and care you put into them.</p>
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</figure> Thank you! I enjoyed the interview, and I’m looking forward to seeing how jME continues to grow and improve – there’s a lot of great talent behind this project!</p>


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