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    <li>Filter, Effect</li>
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<h1 class="page">jME3 Special Effects Overview</h1>
<div id="preamble">
<div class="sectionbody">
<div class="paragraph">
<p>jME3 supports several types of special effects: Post-Processor Filters, SceneProcessors, and Particle Emitters (also known as particle systems). This list contains screenshots and links to sample code that demonstrates how to add the effect to a scene.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="sample-code"><a class="anchor" href="#sample-code"></a>Sample Code</h2>
<div class="sectionbody">
<div class="ulist">
<ul>
<li>
<p>There is one <code>com.jme3.effect.ParticleEmitter</code> class for all Particle Systems.</p>
</li>
<li>
<p>There is one <code>com.jme3.post.FilterPostProcessor</code> class and several <code>com.jme3.post.filters.</code> (all Filters have <code>Filter</code> in their names).</p>
</li>
<li>
<p>There are several <code>SceneProcessor</code> classes in various packages, including e.g. <code>com.jme3.shadow.</code> and <code>com.jme3.water.</code> (SceneProcessor have <code>Processor</code> or <code>Renderer</code> in their names).</p>
</li>
</ul>
</div>
<div class="sect2">
<h3 id="particle-emitter"><a class="anchor" href="#particle-emitter"></a>Particle Emitter</h3>
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">public class MyGame extends SimpleApplication {
  public void simpleInitApp() {
    ParticleEmitter pm = new ParticleEmitter("my particle effect", Type.Triangle, 60);
    Material pmMat = new Material(assetManager, "Common/MatDefs/Misc/Particle.j3md");
    pmMat.setTexture("Texture", assetManager.loadTexture("Effects/spark.png"));
    pm.setMaterial(pmMat);
    pm.setImagesX(1);
    pm.setImagesY(1);
    rootNode.attachChild(pm); // attach one or more emitters to any node
  }
}</code></pre>
</div>
</div>
</div>
<div class="sect2">
<h3 id="scene-processor"><a class="anchor" href="#scene-processor"></a>Scene Processor</h3>
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">public class MyGame extends SimpleApplication {
    private BasicShadowRenderer bsr;

    public void simpleInitApp() {
        bsr = new BasicShadowRenderer(assetManager, 1024);
        bsr.setDirection(new Vector3f(.3f, -0.5f, -0.5f));
        viewPort.addProcessor(bsr); // add one or more sceneprocessor to viewport
    }
...
}</code></pre>
</div>
</div>
</div>
<div class="sect2">
<h3 id="post-processor-filter"><a class="anchor" href="#post-processor-filter"></a>Post-Processor Filter</h3>
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">public class MyGame extends SimpleApplication {
    private FilterPostProcessor fpp; // one FilterPostProcessor per app
    private SomeFilter sf;           // one or more Filters per app

    public void simpleInitApp() {
        fpp = new FilterPostProcessor(assetManager);
        viewPort.addProcessor(fpp); // add one FilterPostProcessor to viewPort

        sf = new SomeFilter();
        fpp.addFilter(sf);  // add one or more Filters to FilterPostProcessor
    }
...
}</code></pre>
</div>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="water"><a class="anchor" href="#water"></a>Water</h2>
<div class="sectionbody">
<div class="paragraph">
<p><span class="image"><img src="../_images/effect/water-post.png" alt="water-post.png" width="150" height="100"></span>
<span class="image"><img src="../_images/effect/water.png" alt="water.png" width="150" height="100"></span>
<span class="image"><img src="../_images/effect/water-reflection-muddy.png" alt="water-reflection-muddy.png" width="150" height="100"></span>
<span class="image"><img src="../_images/effect/underwater2.jpg" alt="underwater2.jpg" width="150" height="100"></span></p>
</div>
<div class="paragraph">
<p>The jMonkeyEngine <a href="water.html" class="xref page">&#8220;SeaMonkey WaterFilter&#8221;</a> simulates ocean waves, foam, including cool underwater caustics.<br>
Use the SimpleWaterProcessor (SceneProcessor) for small, limited bodies of water, such as puddles, drinking troughs, pools, fountains.</p>
</div>
<div class="paragraph">
<p>See also:</p>
</div>
<div class="ulist">
<ul>
<li>
<p><a href="https://hub.jmonkeyengine.org/t/monkeys-at-the-beach/15000">Rendering Water as Post-Process Effect</a> announcement with video.</p>
</li>
<li>
<p><a href="https://github.com/jMonkeyEngine/jmonkeyengine/tree/master/jme3-examples/src/main/java/jme3test/water/TestSceneWater.java">TestSceneWater.java</a> – SimpleWaterProcessor. (SceneProcessor)</p>
</li>
<li>
<p><a href="https://github.com/jMonkeyEngine/jmonkeyengine/tree/master/jme3-examples/src/main/java/jme3test/water/TestSimpleWater.java">TestSimpleWater.java</a> – SimpleWaterProcessor. (SceneProcessor)</p>
</li>
<li>
<p><a href="https://github.com/jMonkeyEngine/jmonkeyengine/tree/master/jme3-examples/src/main/java/jme3test/water/TestPostWater.java">TestPostWater.java</a> – WaterFilter.</p>
</li>
<li>
<p><a href="https://github.com/jMonkeyEngine/jmonkeyengine/tree/master/jme3-examples/src/main/java/jme3test/water/TestPostWaterLake.java">TestPostWaterLake.java</a> – WaterFilter.</p>
</li>
</ul>
</div>
</div>
</div>
<div class="sect1">
<h2 id="environment-effects"><a class="anchor" href="#environment-effects"></a>Environment Effects</h2>
<div class="sectionbody">
<div class="sect2">
<h3 id="depth-of-field-blur"><a class="anchor" href="#depth-of-field-blur"></a>Depth of Field Blur</h3>
<div class="paragraph">
<p><span class="image"><img src="../_images/effect/dof-blur.png" alt="dof-blur.png" width="150" height="100"></span>
<span class="image"><img src="../_images/effect/light-scattering-filter.png" alt="light-scattering-filter.png" width="150" height="100"></span></p>
</div>
<div class="ulist">
<ul>
<li>
<p><a href="https://github.com/jMonkeyEngine/jmonkeyengine/tree/master/jme3-examples/src/main/java/jme3test/post/TestDepthOfField.java">TestDepthOfField.java</a> – DepthOfFieldFilter.</p>
</li>
</ul>
</div>
</div>
<div class="sect2">
<h3 id="fog"><a class="anchor" href="#fog"></a>Fog</h3>
<div class="ulist">
<ul>
<li>
<p><a href="https://github.com/jMonkeyEngine/jmonkeyengine/tree/master/jme3-examples/src/main/java/jme3test/post/TestFog.java">TestFog.java</a> – FogFilter.</p>
</li>
</ul>
</div>
</div>
<div class="sect2">
<h3 id="light-scattering"><a class="anchor" href="#light-scattering"></a>Light Scattering</h3>
<div class="ulist">
<ul>
<li>
<p><a href="https://github.com/jMonkeyEngine/jmonkeyengine/tree/master/jme3-examples/src/main/java/jme3test/post/TestLightScattering.java">TestLightScattering.java</a> – LightScatteringFilter.</p>
</li>
</ul>
</div>
</div>
<div class="sect2">
<h3 id="vegetation"><a class="anchor" href="#vegetation"></a>Vegetation</h3>
<div class="ulist">
<ul>
<li>
<p>Contribution: <a href="../../contributions/lanscapes/vegetationsystem/grass.html" class="xref page">Grass System</a></p>
</li>
<li>
<p>Contribution: <a href="https://hub.jmonkeyengine.org/t/generating-vegetation-paged-geometry-style/18928">Trees (WIP)</a></p>
</li>
</ul>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="light-and-shadows"><a class="anchor" href="#light-and-shadows"></a>Light and Shadows</h2>
<div class="sectionbody">
<div class="sect2">
<h3 id="bloom-and-glow"><a class="anchor" href="#bloom-and-glow"></a>Bloom and Glow</h3>
<div class="paragraph">
<p><span class="image"><img src="../_images/effect/tanlglow1.png" alt="tanlglow1.png" width="150" height="100"></span>
<span class="image"><img src="../_images/effect/shadow-sponza-ssao.png" alt="shadow-sponza-ssao.png" width="150" height="100"></span></p>
</div>
<div class="ulist">
<ul>
<li>
<p><a href="https://github.com/jMonkeyEngine/jmonkeyengine/tree/master/jme3-examples/src/main/java/jme3test/post/TestBloom.java">TestBloom.java</a></p>
</li>
<li>
<p>More details: <a href="bloom_and_glow.html" class="xref page">Bloom and Glow</a> – BloomFilter.</p>
</li>
</ul>
</div>
</div>
<div class="sect2">
<h3 id="light"><a class="anchor" href="#light"></a>Light</h3>
<div class="ulist">
<ul>
<li>
<p><a href="https://github.com/jMonkeyEngine/jmonkeyengine/tree/master/jme3-examples/src/main/java/jme3test/light/TestSimpleLighting.java">TestSimpleLighting.java</a> – DirectionalLight, PointLight.</p>
</li>
<li>
<p><a href="https://github.com/jMonkeyEngine/jmonkeyengine/tree/master/jme3-examples/src/main/java/jme3test/light/TestLightRadius.java">TestLightRadius.java</a> – DirectionalLight, PointLight.</p>
</li>
<li>
<p><a href="https://github.com/jMonkeyEngine/jmonkeyengine/tree/master/jme3-examples/src/main/java/jme3test/light/TestManyLights.java">TestManyLights.java</a> – .j3o scene.</p>
</li>
<li>
<p>More details: <a href="../light/light_and_shadow.html" class="xref page">Light and Shadow</a></p>
</li>
</ul>
</div>
</div>
<div class="sect2">
<h3 id="shadow"><a class="anchor" href="#shadow"></a>Shadow</h3>
<div class="paragraph">
<p><span class="image"><img src="../_images/effect/shadow.png" alt="shadow.png" width="150" height="100"></span>
<span class="image"><img src="../_images/light/light-sources.png" alt="light-sources.png" width="150" height="100"></span></p>
</div>
<div class="ulist">
<ul>
<li>
<p><a href="https://github.com/jMonkeyEngine/jmonkeyengine/tree/master/jme3-examples/src/main/java/jme3test/post/TestSSAO.java">TestSSAO.java</a>, <a href="https://github.com/jMonkeyEngine/jmonkeyengine/tree/master/jme3-examples/src/main/java/jme3test/post/TestSSAO2.java">TestSSAO2.java</a> – SSAOFilter, also known as Screen-Space Ambient Occlusion shadows (SSOA).</p>
</li>
<li>
<p><a href="https://github.com/jMonkeyEngine/jmonkeyengine/tree/master/jme3-examples/src/main/java/jme3test/post/TestTransparentSSAO.java">TestTransparentSSAO.java</a> – SSAOFilter, also known as Screen-Space Ambient Occlusion shadows (SSOA), plus transparency.</p>
</li>
<li>
<p>More details: <a href="../light/light_and_shadow.html" class="xref page">Light and Shadow</a></p>
</li>
</ul>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="special-glass-metal-dissolve-toon"><a class="anchor" href="#special-glass-metal-dissolve-toon"></a>Special: Glass, Metal, Dissolve, Toon</h2>
<div class="sectionbody">
<div class="sect2">
<h3 id="toon-effect"><a class="anchor" href="#toon-effect"></a>Toon Effect</h3>
<div class="paragraph">
<p><span class="image"><img src="../_images/effect/toon-dino.png" alt="toon-dino.png" width="150" height="100"></span></p>
</div>
<div class="ulist">
<ul>
<li>
<p><a href="https://github.com/jMonkeyEngine/jmonkeyengine/tree/master/jme3-examples/src/main/java/jme3test/post/TestCartoonEdge.java">TestCartoonEdge.java</a> – CartoonEdgeFilter.</p>
</li>
<li>
<p><a href="https://github.com/jMonkeyEngine/jmonkeyengine/tree/master/jme3-examples/src/main/java/jme3test/post/TestTransparentCartoonEdge.java">TestTransparentCartoonEdge.java</a> – CartoonEdgeFilter.</p>
</li>
</ul>
</div>
</div>
<div class="sect2">
<h3 id="fade-in-fade-out"><a class="anchor" href="#fade-in-fade-out"></a>Fade in / Fade out</h3>
<div class="ulist">
<ul>
<li>
<p><a href="fade.html" class="xref page">Fade</a> – FadeFilter</p>
</li>
</ul>
</div>
</div>
<div class="sect2">
<h3 id="user-contributed"><a class="anchor" href="#user-contributed"></a>User Contributed</h3>
<div class="paragraph">
<p><span class="image"><img src="../_images/effect/shaderblow_light1.jpg" alt="shaderblow_light1.jpg" width="78" height="150"></span>
<span class="image"><img src="../_images/effect/shaderblow_glass.jpg" alt="shaderblow_glass.jpg" width="80" height="150"></span>
<span class="image"><img src="../../sdk/_images/plugin/shaderblow_matcap.jpg" alt="shaderblow_matcap.jpg" width="150" height="150"></span>
<span class="image"><img src="../_images/effect/shaderblow_light2.jpg" alt="shaderblow_light2.jpg" width="66" height="150"></span></p>
</div>
<div class="paragraph">
<p><a href="../../sdk/plugin/shaderblow.html" class="xref page">ShaderBlow - GLSL Shader Library</a></p>
</div>
<div class="ulist">
<ul>
<li>
<p>LightBlow Shader – blend material texture maps.</p>
</li>
<li>
<p>FakeParticleBlow Shader – jet, fire effect.</p>
</li>
<li>
<p>ToonBlow Shader – Toon Shading, toon edges.</p>
</li>
<li>
<p>Dissolve Shader – Scifi teleportation/dissolve effect.</p>
</li>
<li>
<p>MatCap Shader – Gold, metals, glass, toons…!</p>
</li>
<li>
<p>Glass Shader – Glass.</p>
</li>
<li>
<p>Force Shield Shader – Scifi impact-on-force-field effect.</p>
</li>
<li>
<p>SimpleSprite Shader – Animated textures.</p>
</li>
<li>
<p>SimpleSpriteParticle Shader – Sprite library.</p>
</li>
<li>
<p>MovingTexture Shader – Animated cloud/mist texture.</p>
</li>
<li>
<p>SoftParticles Shader – Fire, clouds, smoke etc.</p>
</li>
<li>
<p>Displace Shader – Deformation effect: Ripple, wave, pulse, swell!</p>
</li>
</ul>
</div>
<div class="paragraph">
<p>Thanks for your awesome contributions! Keep them coming!</p>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="particle-emitters-explosions-fire-smoke"><a class="anchor" href="#particle-emitters-explosions-fire-smoke"></a>Particle Emitters: Explosions, Fire, Smoke</h2>
<div class="sectionbody">
<div class="paragraph">
<p><span class="image"><img src="../_images/effect/explosion-5.png" alt="explosion-5.png" width="150" height="100"></span>
<span class="image"><img src="../_images/effect/particle.png" alt="particle.png" width="150" height="100"></span></p>
</div>
<div class="paragraph">
<p><a href="particle_emitters.html" class="xref page">Particle emitter effects</a> are highly configurable and can have any texture. They can simulate smoke, dust, leaves, meteors, snowflakes, mosquitoes, fire, explosions, clusters, embers, sparks…</p>
</div>
<div class="ulist">
<ul>
<li>
<p><a href="https://github.com/jMonkeyEngine/jmonkeyengine/tree/master/jme3-examples/src/main/java/jme3test/effect/TestExplosionEffect.java">TestExplosionEffect.java</a> – debris, flame, flash, shockwave, smoke, sparks.</p>
</li>
<li>
<p><a href="https://github.com/jMonkeyEngine/jmonkeyengine/tree/master/jme3-examples/src/main/java/jme3test/effect/TestPointSprite.java">TestPointSprite.java</a> – cluster of points.</p>
</li>
<li>
<p><a href="https://github.com/jMonkeyEngine/jmonkeyengine/tree/master/jme3-examples/src/main/java/jme3test/effect/TestMovingParticle.java">TestMovingParticle.java</a> – dust, smoke.</p>
</li>
</ul>
</div>
<div class="sect2">
<h3 id="creating-your-own-filters"><a class="anchor" href="#creating-your-own-filters"></a>Creating your own Filters</h3>
<div class="paragraph">
<p>Here is an extract taken from @nehon in the forum thread (<a href="https://hub.jmonkeyengine.org/t/how-exactly-do-filters-work/26871">http://hub.jmonkeyengine.org/forum/topic/how-exactly-do-filters-work/</a>)</p>
</div>
<div class="paragraph">
<p>The methods are called in this order (pretty much the same flow as processors):
- initFilter() is called once when the FilterPostProcessor is initialized or when the filter is added to the processor and this one as already been initialized.</p>
</div>
<div class="paragraph">
<p>for each frame the methods are called in that sequence :
- preFrame() occurs before anything happens
- postQueue() occurs once the queues have been populated (there is one queue per bucket and 2 additional queues for the shadows, casters and receivers). Note that geometries in the queues are the one in the view frustum.
- postFrame occurs once the main frame has been rendered (the back buffer)</p>
</div>
<div class="paragraph">
<p>Those methods are optional in a filter, they are only there if you want to hook in the rendering process.</p>
</div>
<div class="paragraph">
<p>The material variable is here for convenience. You have a getMaterial method that returns the material that’s gonna be used to render the full screen quad. It just happened that in every implementation I had a material attribute in all my sub-classes, so I just put it back in the abstract class. Most of the time getMaterial returns this attribute.</p>
</div>
<div class="paragraph">
<p>Forced-technique can be any technique really, they are more related with the material system than to the filters but anyway. When you use a forced technique the renderer tries to select it on the material of each geometry, if the technique does not exists for the material the geometry is not rendered.
You assume well about the SSAO filer, the normal of the scene are rendered to a texture in a pre pass.</p>
</div>
<div class="paragraph">
<p>Passes : these are filters in filters in a way. First they are a convenient way to initialize a FrameBuffer and the associated textures it needs, then you can use them for what ever you want.
For example, a Pass can be (as in the SSAO filter) an extra render of the scene with a forced technique, and you have to handle the render yourself in the postQueue method.
It can be a post pass to do after the main filter has been rendered to screen (for example an additional blur pass used in SSAO again). You have a list of passes called postRenderPass in the Filter abstract class. If you add a pass to this list, it’ll be automatically rendered by the FilterPostProcessor during the filter chain.</p>
</div>
<div class="paragraph">
<p>The bloom Filter does an intensive use of passes.</p>
</div>
<div class="paragraph">
<p>Filters in a nutshell.</p>
</div>
<div class="paragraph">
<p>See also:</p>
</div>
<div class="ulist">
<ul>
<li>
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