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Avengers UTD Chronicles

HUD “atmospheric” controls

Posted by , in Odyssey UI, The Odyssey 03 November 2014 - - - - - - · 663 views

Last month has seen little development as I needed to move to another city in the UK where I'm going to start a new job. So for the last weeks I have been living among boxes (and still am to some extents). Further, the new development machine I built had to have some faulty components so development has been delayed.

I am still busy implementing some features needed for the introductory cutscene. I have refactored the UI so that it is scalable. The size of every control is expressed in "Units". At 1920x1080 a unit is 32 pixels long. At different resolutions, the basic unit is scaled accordingly. For example 2560x1440 is 1.333 times bigger than 1920x1080, so a unit would become about 42.6 pixels.
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The picture is supposed to represent the Commander's HUD as the ship travels near Mars towards Saturn. The game itself will not be in first person. The rendering seemed a bit empty so I added an "atmospheric" HUD control in the lower right, the one with the caption "Singularity Phase". It is a simple column chart implemented in DirectX. The control derives from the basic ItemsControl in my UI library that allows generating templated child control based on its ItemsSource property, just like in WPF. For now, you can simply assign an array of float values and it will create the appropriate number of columns in the chart, giving a relative height depending on the chart's width, height and minimum and maximum values set for it.

While animated, the chart looks like this:

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It was really simple to implement and animate. Basically the RandomColumnChart derives from the base ColumnChart and exposes a Period property. The period represent the number of seconds before new random values are generated. During each update, each column is interpolated from the current start values and the next array of values. After the specified period of time has elapsed, those values are used as the new starting values and new ones are generated. Then the cycle runs again.

I might need another of these controls to display some kind of sin waves for example... But I shouldn't let myself be too distracted, I'd like to start working on the main part of the game soon!

Animation test video

Posted by , in The Odyssey 07 September 2014 - - - - - - · 740 views

For work-related reasons I have been using the Unity engine for the last few months. There are some things I like: it is incredibly easy to set up something and view it live with a few clicks. The editor is very powerful and it is something that I would really like to have for my engine. However, being an incredibly stubborn developer, Unity is not something that I can feel as being "mine", so I'd rather spend twice as much time (or even more) to build my own engine.

This brings us to the matter at hand. My engine does not (yet?) have a visual editor with which I can script animations and preview them. As you may recall, I implemented animation features for my UI library. I have extended that system to the rest of my Entity-Component-System framework. Using my xml-like language is the next-best thing, if compared to actually writing the code necessary to create the animation objects from scratch. Instead, I can define them with a few lines and the parser will take care of orchestrating everything. I have thus created a Cutscene class that is able to animate all entities in the Scene and is also able to reference other hardcoded animations such as those belonging to UI controls. I need these animation features for two main reasons: first, I'm working on an "announcement" trailer of sorts and second, once I move to the actual ship-to-ship combat part of the game, once you issue an order, it will be visually shown by a contextual cutscene, similar to the way it happens in the recent X-Com game. Here is an example of the Cutscene animation shown in the above video.
  <Animation Name="FocusOnPath" WrapMode="Loop">
    <BoolCurve TargetName="{Overlay[UserInterface[twLocation]]}" TargetProperty="IsVisible" >
      <BoolKeyFrame Time="0.0" Value="True"/>
      <BoolKeyFrame Time="7.0" Value="False"/>
    <QuaternionCurve TargetName="{PerspectiveCamera[Rotation]}" TargetProperty="Orientation">
      <QuaternionKeyFrame Time="8" Value="E0,0,0"/>
      <QuaternionKeyFrame Time="10" Value="E90,0,0"/>
    <BoolCurve TargetName="{Overlay[UserInterface[Prompt]]}" TargetProperty="IsVisible" >
      <BoolKeyFrame Time="0.0" Value="False"/>
      <BoolKeyFrame Time="8.0" Value="True"/>
      <BoolKeyFrame Time="20.0" Value="False"/>
    <BoolCurve TargetName="{Overlay[UserInterface[lVenus]]}" TargetProperty="IsVisible" Function="SquareWave" Options="8">
      <BoolKeyFrame Time="0.0" Value="False"/>
      <BoolKeyFrame Time="12.5" Value="False"/>
      <BoolKeyFrame Time="15.5" Value="True"/>
    <BoolCurve TargetName="{Overlay[UserInterface[Target]]}" TargetProperty="IsVisible" Function="SquareWave" Options="4">
      <BoolKeyFrame Time="20.0" Value="False"/>
      <BoolKeyFrame Time="23.0" Value="True"/>
    <BoolCurve TargetName="{Overlay[UserInterface[lCountdown]]}" TargetProperty="IsVisible" >
      <BoolKeyFrame Time="0.0" Value="False"/>
      <BoolKeyFrame Time="20.0" Value="True"/>
    <FloatCurve TargetName="{Path[PrimitiveReveal]}" TargetProperty="PrimitiveRatio">
      <FloatKeyFrame Time="23" Value="0"/>
      <FloatKeyFrame Time="26" Value="1.0"/>
      <FloatKeyFrame Time="30" Value="1.0"/>
    <PlayAnimationCommand TargetName="{Overlay[UserInterface[twLocation]]}" Time ="2"/>
    <PlayAnimationCommand TargetName="{Overlay[UserInterface[Prompt]]}" Time ="10"/>
The top-level object in my ECS is the Scene, an object containing all entities in the game world. As such it implements an interface that is able to return individual entities by name. So when the parser finds a string value in the TargetName attribute it asks the Scene object to return the correct entity. If the value is in array syntax, the Entity object (which implements the same interface as well) will return the component specified as the index of the array. This can go on for more layers as it can be observed from the boolean curves targeting UI elements. Overlay is the UI entity, while UserInterface is the actual UI component holding a reference to the GUI object; the third index is the name of the individual UI control being referenced. I have also implemented a few functions to avoid generating individual keyframes to approximate some effects, such as the SquareWave function that animates the flickering of the target brackets.

Finally, the Commands section references other animations that are defined elsewhere, either as other cutscenes or as hardcoded animation. In this case those two animations are the built-in animations of the Typewriter effect. This cutscene will activate the first one two seconds into the animation and the other one ten seconds into.

So all things considered, it’s a nice compromise if a visual editor is not available. Now, that typewriter definitely needs some sound effects… Also, I can now work on the animation concerning the Campaign Screen!

BSplines and Typewriter effects

Posted by , in Odyssey UI, The Odyssey 26 August 2014 - - - - - - · 752 views

In the past days, I've been busy working on several things concerning the implementation of cutscenes during the game. In my mind, the game opens on a depiction of the Solar System where the moments just before the Odyssey leaves Earth Orbit would be shown. Imagine yourself as the commander of this ship, in a sci-fi universe of vector graphics and green terminals that beep when keys are typed. Running through the checklist moments before the Odyssey leaves the Solar System you would probably see something like the following image.

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This would be a part of the introductory cutscene that I hope to show you in the near future. These screens would be interleaved with "cinematic" title screens explaining the back story. In order to draw the purple path you see in the picture, I needed to implement a BSpline plotting algorithm. It's not yet perfect as I would ideally be able to implement constant arc length parametrization (!). You can't see it from the picture, but the path is being rendered as a 3D polyline joining various rectangle polygons. The issue is that the curve segments are not spaced equidistantly. Then again, if you can't see it then it's not really a problem. It's not high priority right now but I would like to have more control over it.

The second part of the title gets us to the fundamental typewriter effect we so desperatly need in an universe like this. I have implemented this effect using my UI library:

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The speed of the Typewriter can be configured using its CharactersPerSecond property. Using this information we can determine how many characters to reveal at each update. The Typewriter is using a Direct2D TextLayout object. Since this object needs to be instantiated with its text content from the beginning, i.e. the text string is an argument of the constructor, I assumed that recreating it at each character update would not be the best approach performance-wise. What I hope is a better solution was to create this object fully invisible (i.e., transparent). The TextLayout allows us to apply brushes (i.e. colours) to specific text ranges. So that's what the animation is doing. At each update it increases the number of character the green brush is applied, while the others stay transparent. Each update generates a TextRangeChanged event, which in turn is used to update the caret's position. The next step will be to implement a blinking animation for the caret and other nice features such as carriage return, line scrolling and so on.

This is a feature that will be used extensively in the actual game. The log window, or more enthusiastically, THE COMM CHANNEL, will display information about what's going on in the minds of the AI-controlled ships. So, THE COMM CHANNEL, will describe "in prose" what's happening on screen. I enjoy both seeing space dogfights but also reading about them. Hopefully, reading sentences like "Red 5, breaking formation", "ALL HANDS, BATTLESTATIONS!", "IT'S A TRAP", or "I'll see you on the other side" will add to the idea of witnessing a space battle from the command room of a capital ship. Ideally the radio chatter would also be fully voiced, but that maybe is stretching too far the imagination considering the resources currently available.

That's it for now, back to implementing the blinking caret Posted Image

The Odyssey, a turn-based sci-fi tactical game

Posted by , in The Odyssey 27 July 2014 - - - - - - · 1,212 views
indie, sci-fi, turn-based
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Campaign map
In short
The Odyssey is a turn-based sci-fi tactical game where you play the role of a Fleet Commander in a space conflict. Why turn-based? I felt that there was an over-abundance of real-time games set in space. Turn-based games give you more time to think and can be very addictive, if done well, as X-Com or the Civilization series have shown. Plus, it opens the possibility of asynchronous multiplayer games.

The story
It is 2282 C.E.: Humanity has colonised the nearby planets of the Solar System and established outposts and research stations in the Trans-Neptunian reaches of space. However, more than 15 billion people now live on Terra and tensions between the Old World and the New Worlds are high. An almost depleted Earth is highly dependent on her colonies, although it remains the sole authority in the Solar System.

The Eye of Titan, a space telescope in orbit around Titan, has identified various planets in the habitable zone around nearby yellow main sequence stars: Tau Ceti, Sigma Draconis and Eta Cassiopeia. Three ships using an experimental Anti-Matter drive have been built. Theory and laboratory studies confirm that it will be able to provide enough power to warp the space between the Solar System and the destination. In practice, it has never been tested before. The UTS Winter Solstice, the UTS Dream of Mankind and the UTS Odyssey are en route towards the far reaches of the Oort Cloud where the Anti-Matter drive will be activated. Each ship will escort a small flotilla of ships carrying colonists in cryogenic stasis, deployable factories and biological arks. The voyage is one-way only. You are the commander of the UTS Odyssey and all of mankind’s hopes are with you. Especially after NASA's Chiron program, a generation ship travelling at 0.1 times the speed of light, failed to contact Terra after its 50 years voyage to Alpha Centauri.

The setting
The game is set at the very beginning of interstellar exploration. No alien civilizations have been contacted yet, if any do exists after all. Humanity’s only enemy is itself. The Odyssey, your ship, is a space carrier. Close to Pluto, it will rendezvous the UTS Voyager, a colony ship; the UTS Gagarin, a transport ship with the resources to build infrastructure upon landing and the UTS Darwin, a biological vessel containing seeds, embryos, livestock and everything else needed to jumpstart life. Its route is set towards Sigma Draconis. It is expected that the warp field generated by the Odyssey’s drive will envelope the other ships as well.

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Preliminary render of the battle grid
The Game
Somewhere along the way towards Sigma Draconis, conflict will erupt. One of the key points of the game is that you as commander will not have total control over every single ship in the fleet. Alongside the traditional “Action Points” of turn based games, The Odyssey will build on the concept of “Command Points”. Your character will only be able to influence or advise a limited number of ships in your fleet per turn. The ships you do not choose to advise will act as their own ship captain will decide. Each ship captain will have RPG-like characteristics that will influence its decisions. Bravery, morale, discipline, etc. Each ship will belong to a particular “class” which will define the type of operations it is able to conduct. The Odyssey is a space carrier. It hosts several vessels capable of orbital insertion and interplanetary sublight travel. It is armed but it is something that has been kept hidden to the public. All other ships in the solar system are armed with high precision lasers against space debris, at best. Over the course of the game you will have access to ships capable of boarding and long-range strikes. The general idea is that capital ships do not enjoy the same manoeuvrability of single-pilot vessels. Once in motion, a capital ship will take several turns to “brake”. The game will feature a story-driven campaign, possibly more.

The first screen at the beginning of this post is a preliminary draft of the Campaign Screen. Your fleet will move in-system towards the orbit of Pluto where you will attempt to warp towards Sigma Draconis. In this part of the game, you will control your fleet in a similar way to Mass Effect's own system-level screen. Exploration will be a big part of the game as you will need resources to keep your fleet operational. When all hands will need to man their battlestations, the actual battle will be played on a hexagonal grid.

When will be able to play it? Can I help?
At this point in development it is very early to tell. However I, the developer, have already built a sizeable portion of the game engine. I am at point where the next technical steps to implement will depend on the direction the gameplay will take.
You can help in several ways. First and foremost by following the development of the game. Motivation from the community will be a deciding factor in the success of the game. If you like the idea, if you feel that a turn-based space-themed game is something that you would like to play someday, I would be glad to hear your feedback. More details on the gameplay will emerge as I flesh them out.
Furthermore, if you have art that you would like to contribute such as 2D or 3D art, sounds, music, etc. I would really appreciate it, as it is not one of my main skills. Stay tuned for more updates about the voyage of The Odyssey!


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