mujoco

<mujoco model="Reflection: cube texture">
  <!-- Minimal planar-reflection bed for the cube-textured reflect path:
         mirror -> phong_cube_reflect (cube texture sampled by position)
       The floor is matte so only the cube path reflects. See reflection.xml
       for the full integration scene. -->

  <asset>
    <texture name="sky" type="skybox" builtin="gradient" rgb1=".18 .22 .30" rgb2=".55 .58 .62" width="32" height="512"/>
    <texture name="ibl" type="cube" builtin="gradient" rgb1=".32 .35 .40" rgb2=".58 .56 .52" width="32" height="32"/>
    <texture name="tint" type="cube" builtin="gradient" rgb1=".10 .12 .30" rgb2=".30 .16 .12" width="64" height="64"/>
    <material name="floor"  rgba=".32 .34 .38 1"/>
    <material name="mirror" texture="tint" reflectance=".8"/>
    <material name="post"   rgba=".82 .16 .16 1"/>
    <material name="ball"   rgba=".20 .68 .30 1"/>
  </asset>

  <worldbody>
    <camera name="default" pos="2.997 -1.006 2.846" xyaxes="0.250 0.968 0.000 -0.455 0.118 0.882"/>
    <light pos="1.5 0.6 2.6" dir="-0.6 -0.2 -2" cutoff="55" range="20" intensity="800000"
           castshadow="true" ambient=".1 .1 .12" type="spot"/>
    <light type="image" texture="ibl" intensity="8000"/>

    <geom name="floor"  type="plane" size="3 3 .1" material="floor"/>
    <geom name="mirror" type="box"   size="1.0 0.7 0.02" material="mirror" pos="-1.2 0 0.7" euler="0 85 0"/>
    <geom name="post"   type="box"    material="post" size=".05 .05 .5" pos="0 0 0.5"/>
    <geom name="ball"   type="sphere" material="ball" size=".22" pos="0.4 -0.5 0.22"/>
  </worldbody>
</mujoco>