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  <section id="global-physics-config">
<h1>Global Physics Config<a class="headerlink" href="#global-physics-config" title="Permalink to this headline">¶</a></h1>
<p>The <code class="docutils literal notranslate"><span class="pre">global.physics_config</span></code> resource defines physics materials, collision
filters, and actor classes used by Crown’s physics simulation. The file is
stored in SJSON format and must be edited manually.</p>
<section id="example">
<h2>Example<a class="headerlink" href="#example" title="Permalink to this headline">¶</a></h2>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">materials</span> <span class="o">=</span> <span class="p">{</span>
    <span class="n">default</span> <span class="o">=</span> <span class="p">{</span> <span class="n">friction</span> <span class="o">=</span> <span class="mf">0.8</span> <span class="n">restitution</span> <span class="o">=</span> <span class="mf">0.81</span> <span class="p">}</span>
<span class="p">}</span>

<span class="n">collision_filters</span> <span class="o">=</span> <span class="p">{</span>
    <span class="n">no_collision</span> <span class="o">=</span> <span class="p">{</span> <span class="n">collides_with</span> <span class="o">=</span> <span class="p">[]</span> <span class="p">}</span>
    <span class="n">default</span> <span class="o">=</span> <span class="p">{</span> <span class="n">collides_with_all_except</span> <span class="o">=</span> <span class="p">[</span> <span class="s2">&quot;no_collision&quot;</span> <span class="p">]</span> <span class="p">}</span>
<span class="p">}</span>

<span class="n">actors</span> <span class="o">=</span> <span class="p">{</span>
    <span class="n">static</span> <span class="o">=</span> <span class="p">{</span> <span class="n">dynamic</span> <span class="o">=</span> <span class="n">false</span> <span class="p">}</span>
    <span class="n">dynamic</span> <span class="o">=</span> <span class="p">{</span> <span class="n">dynamic</span> <span class="o">=</span> <span class="n">true</span> <span class="p">}</span>
    <span class="n">keyframed</span> <span class="o">=</span> <span class="p">{</span> <span class="n">dynamic</span> <span class="o">=</span> <span class="n">true</span> <span class="n">kinematic</span> <span class="o">=</span> <span class="n">true</span> <span class="n">disable_gravity</span> <span class="o">=</span> <span class="n">true</span> <span class="p">}</span>
    <span class="n">trigger</span> <span class="o">=</span> <span class="p">{</span> <span class="n">trigger</span> <span class="o">=</span> <span class="n">true</span> <span class="p">}</span>
<span class="p">}</span>
</pre></div>
</div>
</section>
<section id="materials">
<span id="physics-materials"></span><h2>Materials<a class="headerlink" href="#materials" title="Permalink to this headline">¶</a></h2>
<p>Physics materials define surface response parameters for <a class="reference internal" href="rigid_bodies.html#actors"><span class="std std-ref">actors</span></a>. Create a new material by adding an entry to the <code class="docutils literal notranslate"><span class="pre">materials</span></code>
object:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">materials</span> <span class="o">=</span> <span class="p">{</span>
    <span class="n">default</span> <span class="o">=</span> <span class="o">...</span>
    <span class="n">slippery</span> <span class="o">=</span> <span class="p">{</span> <span class="n">friction</span> <span class="o">=</span> <span class="mf">0.1</span> <span class="p">}</span>
<span class="p">}</span>
</pre></div>
</div>
<p>Common material properties:</p>
<ul class="simple">
<li><p><code class="docutils literal notranslate"><span class="pre">friction</span></code>: general contact friction; larger values increase resistance to
sliding.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">rolling_friction</span></code>: torsional friction orthogonal to the contact normal;
helps stop spheres rolling forever.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">spinning_friction</span></code>: torsional friction around the contact normal; useful
for grasping.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">restitution</span></code>: coefficient of restitution; 1 = perfectly elastic
collision, &lt; 1 = inelastic.</p></li>
</ul>
</section>
<section id="collision-filters">
<h2>Collision filters<a class="headerlink" href="#collision-filters" title="Permalink to this headline">¶</a></h2>
<p>Collision filters control which <a class="reference internal" href="rigid_bodies.html#actors"><span class="std std-ref">actors</span></a> interact with which. Define a
filter by adding an entry to the <code class="docutils literal notranslate"><span class="pre">collision_filters</span></code> object:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">collision_filters</span> <span class="o">=</span> <span class="p">{</span>
    <span class="o">...</span>
    <span class="n">wall</span> <span class="o">=</span> <span class="p">{}</span>
    <span class="n">player</span> <span class="o">=</span> <span class="p">{</span> <span class="n">collides_with</span> <span class="o">=</span> <span class="p">[</span> <span class="s2">&quot;wall&quot;</span> <span class="p">]</span> <span class="p">}</span>
<span class="p">}</span>
</pre></div>
</div>
<p>The filter name (for example <code class="docutils literal notranslate"><span class="pre">player</span></code>) can then be assigned to actors. Use
<code class="docutils literal notranslate"><span class="pre">collides_with</span></code> to list specific filters this filter should collide with,
or <code class="docutils literal notranslate"><span class="pre">collides_with_all_except</span></code> to collide with everything except the
specified filters.</p>
<section id="collision-rule">
<h3>Collision rule<a class="headerlink" href="#collision-rule" title="Permalink to this headline">¶</a></h3>
<p>Two actors A and B generate collisions if either of the following is true:</p>
<ul class="simple">
<li><p>A’s filter has B in its <code class="docutils literal notranslate"><span class="pre">collides_with</span></code> set, or</p></li>
<li><p>B’s filter has A in its <code class="docutils literal notranslate"><span class="pre">collides_with</span></code> set.</p></li>
</ul>
</section>
</section>
<section id="actor-classes">
<h2>Actor classes<a class="headerlink" href="#actor-classes" title="Permalink to this headline">¶</a></h2>
<p>Actor classes are used to specify simulation properties to apply
to <a class="reference internal" href="rigid_bodies.html#actors"><span class="std std-ref">Actors</span></a>. Define classes inside the <code class="docutils literal notranslate"><span class="pre">actors</span></code> object:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">actors</span> <span class="o">=</span> <span class="p">{</span>
    <span class="n">static</span> <span class="o">=</span> <span class="p">{</span> <span class="n">dynamic</span> <span class="o">=</span> <span class="n">false</span> <span class="p">}</span>
    <span class="n">dynamic</span> <span class="o">=</span> <span class="p">{</span> <span class="n">dynamic</span> <span class="o">=</span> <span class="n">true</span> <span class="p">}</span>
    <span class="n">keyframed</span> <span class="o">=</span> <span class="p">{</span> <span class="n">dynamic</span> <span class="o">=</span> <span class="n">true</span> <span class="n">kinematic</span> <span class="o">=</span> <span class="n">true</span> <span class="n">disable_gravity</span> <span class="o">=</span> <span class="n">true</span> <span class="p">}</span>
    <span class="n">trigger</span> <span class="o">=</span> <span class="p">{</span> <span class="n">trigger</span> <span class="o">=</span> <span class="n">true</span> <span class="p">}</span>
<span class="p">}</span>
</pre></div>
</div>
<p>Common actor class properties:</p>
<ul class="simple">
<li><p><code class="docutils literal notranslate"><span class="pre">linear_damping</span></code>: resistance applied to linear motion; useful to slow down
objects unaffected by friction.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">angular_damping</span></code>: resistance applied to angular motion.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">dynamic</span></code>: when true, the actor is simulated each frame by the physics
engine. If false, the actor cannot move but just collide.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">kinematic</span></code>: when true, the actor is driven externally (animation or code)
rather than by physics. Kinematic objects push dynamic objects away but are
unaffected by them.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">disable_gravity</span></code>: disables gravity for the actor.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">trigger</span></code>: actor does not produce collision responses but still generates
overlap events.</p></li>
</ul>
</section>
</section>


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