message: restore simple mitsuba scene to default
diff: <?xml version="1.0" encoding="utf-8"?>
  <scene version="0.5.0">
  -<integrator type="direct">
  +<integrator type="path">
  + <integer name="maxDepth" value="10"/>
  </integrator>
  <!--<sensor type="thinlens">-->
  </film>
  </sensor>
  +<emitter type="constant">
  + <rgb name="radiance" value="0.15,0.21,0.3"/>
  +</emitter>
  <shape type="sphere">
  <transform name="toWorld"><translate x="0" y="-100.5" z="-1"/></transform>
  <float name="intIOR" value="1.5"/>
  </bsdf>
  </shape>
  -<shape type="rectangle">
  +<shape type="sphere">
  <transform name="toWorld"><translate x="-1.5" y="1.5" z="0"/></transform>
  + <float name="radius" value="0.3"/>
  <emitter type="area">
  <rgb name="radiance" value="30,25,15"/>
  </emitter>
  