A complete scene definition would look something like:

<svg ...>
SVG commands
<metadata>
  <scenes>
    <timing>18.97s</timing>
    <startid_text>strt</startid_text>
    <begin_text>strt0</begin_text>
    <scene_origin>1</scene_origin>

    <objbg transform="translate(0,0,-300)">
      <obj class="mt01" href="mt01"/>
      <obj class="mt02" href="mt02"/>
    </objbg>

    <objbg transform="rotx(90)">
      <obj class="fg01" href="fg01"/>
      <obj class="fg02" href="fg02"/>
    </objbg>

    <scene id="st1">
      <perspective>
        <over>-20</over>
        <up>-11</up>
        <rad>1600</rad>
        <pp>1800</pp>
        <newx>0</newx>
        <newy>0</newy>
        <scale>1</scale>
        <spline>constant</spline>
      </perspective>

      <objfg transform="translate(-145,-64,80) roty(45)">
        <obj class="wdm3" href="wdm01" transform="rotz(60)" />
        <obj class="wdm4"  href="wdm02" transform="rotz(60)" />
      </objfg>
    </scene>

    <scene id="st2">
      ....
    </scene>
    
    <objbgafter transform="rotx(90)">
      <obj class="fg01" href="fg01"/>
      <obj class="fg02" href="fg02"/>
    </objbgafter>
  </scenes>
</metadata>

<defs>
<path id="mt01"  d="M-2000,-494v494h4000v-494z"/>
<path id="mt02"  d="M2000,-57C966,-67 933,-67 900,-57..."/>
<path id="fg01"  d="..."/>
<path id="fg02"  d="......"/>
<path id="wdm01"  d="..."/>
<path id="wdm02"  d="......"/>

<path3d id="xyz" d="M0,-140,-130 Ll0,0,-40 Ll0,-40,0 Ll0,0,40Z"/>

<point id="FA" x="0"   y="0"    z="0"/>  
<point id="FD" x="-300"   y="0"    z="0"/> 
<point id="BA" x="0"   y="0"    z="-300"/> 
<point id="BD" x="-300"   y="0"    z="-300"/> 

<p_path3d id="w19Hut_floor"> <M p="FA"/><L p="BA"/><L p="BD"/><L p="FD"/><Z /></p_path3d>
</defs>

SVG commands
</svg>