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+        </bsdf>
+    </bsdf>
+    <bsdf type="twosided" id="mat-itu_metal">
+        <bsdf type="diffuse">
+            <rgb value="0.219526 0.219526 0.254152" name="reflectance"/>
+        </bsdf>
+    </bsdf>
+    <bsdf type="twosided" id="mat-itu_wood">
+        <bsdf type="diffuse">
+            <rgb value="0.043 0.58 0.184" name="reflectance"/>
+        </bsdf>
+    </bsdf>
+    <bsdf type="twosided" id="mat-itu_wet_ground">
+        <bsdf type="diffuse">
+            <rgb value="0.91 0.569 0.055" name="reflectance"/>
+        </bsdf>
+    </bsdf>
+    <emitter type="constant" id="World">
+        <rgb value="1.000000 1.000000 1.000000" name="radiance"/>
+    </emitter>
+    <sensor type="perspective" id="Camera">
+        <string name="fov_axis" value="x"/>
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+            <rotate z="1" angle="-90"/>
+            <translate value="0 0 100"/>
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+        <sampler type="independent">
+            <integer name="sample_count" value="$spp"/>
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+        <film type="hdrfilm">
+            <integer name="width" value="$resx"/>
+            <integer name="height" value="$resy"/>
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+    </sensor>
+    <shape type="ply" id="mesh-ground">
+        <string name="filename" value="mesh/ground.ply"/>
+        <ref id="mat-itu_wet_ground" name="bsdf"/>
+        <boolean name="face_normals" value="true"/>
+    </shape>
+    <shape type="ply" id="mesh-building_0">
+        <string name="filename" value="mesh/building_0.ply"/>
+        <ref id="mat-itu_marble" name="bsdf"/>
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+        <ref id="mat-itu_marble" name="bsdf"/>
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+        <ref id="mat-itu_marble" name="bsdf"/>
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+        <ref id="mat-itu_marble" name="bsdf"/>
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+        <ref id="mat-itu_marble" name="bsdf"/>
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+    <shape type="ply" id="mesh-building_5">
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+        <ref id="mat-itu_marble" name="bsdf"/>
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+        <ref id="mat-itu_marble" name="bsdf"/>
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+        <ref id="mat-itu_marble" name="bsdf"/>
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+        <ref id="mat-itu_marble" name="bsdf"/>
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+<?xml version="1.0" ?>
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+    <default name="resy" value="768"/>
+    <integrator type="path">
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+        </bsdf>
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+        <bsdf type="diffuse">
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+        </bsdf>
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+    <bsdf type="twosided" id="mat-itu_wet_ground">
+        <bsdf type="diffuse">
+            <rgb value="0.91 0.569 0.055" name="reflectance"/>
+        </bsdf>
+    </bsdf>
+    <emitter type="constant" id="World">
+        <rgb value="1.000000 1.000000 1.000000" name="radiance"/>
+    </emitter>
+    <sensor type="perspective" id="Camera">
+        <string name="fov_axis" value="x"/>
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+        <float name="principal_point_offset_x" value="0.000000"/>
+        <float name="principal_point_offset_y" value="-0.000000"/>
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+        <transform name="to_world">
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+            <rotate y="1" angle="0"/>
+            <rotate z="1" angle="-90"/>
+            <translate value="0 0 100"/>
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+        <sampler type="independent">
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+        <film type="hdrfilm">
+            <integer name="width" value="$resx"/>
+            <integer name="height" value="$resy"/>
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+    <shape type="ply" id="mesh-ground">
+        <string name="filename" value="mesh/ground.ply"/>
+        <ref id="mat-itu_wet_ground" name="bsdf"/>
+        <boolean name="face_normals" value="true"/>
+    </shape>
+    <shape type="ply" id="mesh-building_0">
+        <string name="filename" value="mesh/building_0.ply"/>
+        <ref id="mat-itu_marble" name="bsdf"/>
+        <boolean name="face_normals" value="true"/>
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+        <string name="filename" value="mesh/building_1.ply"/>
+        <ref id="mat-itu_marble" name="bsdf"/>
+        <boolean name="face_normals" value="true"/>
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+        <ref id="mat-itu_marble" name="bsdf"/>
+        <boolean name="face_normals" value="true"/>
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+    <shape type="ply" id="mesh-building_3">
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+        <ref id="mat-itu_marble" name="bsdf"/>
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+        <ref id="mat-itu_marble" name="bsdf"/>
+        <boolean name="face_normals" value="true"/>
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+    <shape type="ply" id="mesh-building_5">
+        <string name="filename" value="mesh/building_5.ply"/>
+        <ref id="mat-itu_marble" name="bsdf"/>
+        <boolean name="face_normals" value="true"/>
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+        <ref id="mat-itu_marble" name="bsdf"/>
+        <boolean name="face_normals" value="true"/>
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+        <boolean name="face_normals" value="true"/>
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+        <ref id="mat-itu_marble" name="bsdf"/>
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+        <ref id="mat-itu_marble" name="bsdf"/>
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+        <ref id="mat-itu_marble" name="bsdf"/>
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+        <ref id="mat-itu_marble" name="bsdf"/>
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+        <ref id="mat-itu_marble" name="bsdf"/>
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+    <default name="spp" value="4096"/>
+    <default name="resx" value="1024"/>
+    <default name="resy" value="768"/>
+    <integrator type="path">
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+        </bsdf>
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+    <bsdf type="twosided" id="mat-itu_marble">
+        <bsdf type="diffuse">
+            <rgb value="0.701101 0.644479 0.48515" name="reflectance"/>
+        </bsdf>
+    </bsdf>
+    <bsdf type="twosided" id="mat-itu_metal">
+        <bsdf type="diffuse">
+            <rgb value="0.219526 0.219526 0.254152" name="reflectance"/>
+        </bsdf>
+    </bsdf>
+    <bsdf type="twosided" id="mat-itu_wood">
+        <bsdf type="diffuse">
+            <rgb value="0.043 0.58 0.184" name="reflectance"/>
+        </bsdf>
+    </bsdf>
+    <bsdf type="twosided" id="mat-itu_wet_ground">
+        <bsdf type="diffuse">
+            <rgb value="0.91 0.569 0.055" name="reflectance"/>
+        </bsdf>
+    </bsdf>
+    <emitter type="constant" id="World">
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+        <sampler type="independent">
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+<?xml version="1.0" ?>
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+    <bsdf type="twosided" id="mat-itu_wet_ground">
+        <bsdf type="diffuse">
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+    <emitter type="constant" id="World">
+        <rgb value="1.000000 1.000000 1.000000" name="radiance"/>
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+    <sensor type="perspective" id="Camera">
+        <string name="fov_axis" value="x"/>
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+        <float name="principal_point_offset_x" value="0.000000"/>
+        <float name="principal_point_offset_y" value="-0.000000"/>
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+        </bsdf>
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+        </bsdf>
+    </bsdf>
+    <bsdf type="twosided" id="mat-itu_wood">
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+        </bsdf>
+    </bsdf>
+    <bsdf type="twosided" id="mat-itu_wet_ground">
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+        </bsdf>
+    </bsdf>
+    <emitter type="constant" id="World">
+        <rgb value="1.000000 1.000000 1.000000" name="radiance"/>
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+    <sensor type="perspective" id="Camera">
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+        <ref id="mat-itu_marble" name="bsdf"/>
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+        <ref id="mat-itu_marble" name="bsdf"/>
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+<?xml version="1.0" ?>
+<scene version="2.1.0">
+    <default name="spp" value="4096"/>
+    <default name="resx" value="1024"/>
+    <default name="resy" value="768"/>
+    <integrator type="path">
+        <integer name="max_depth" value="12"/>
+    </integrator>
+    <bsdf type="twosided" id="mat-itu_concrete">
+        <bsdf type="diffuse">
+            <rgb value="0.539479 0.539479 0.53948" name="reflectance"/>
+        </bsdf>
+    </bsdf>
+    <bsdf type="twosided" id="mat-itu_marble">
+        <bsdf type="diffuse">
+            <rgb value="0.701101 0.644479 0.48515" name="reflectance"/>
+        </bsdf>
+    </bsdf>
+    <bsdf type="twosided" id="mat-itu_metal">
+        <bsdf type="diffuse">
+            <rgb value="0.219526 0.219526 0.254152" name="reflectance"/>
+        </bsdf>
+    </bsdf>
+    <bsdf type="twosided" id="mat-itu_wood">
+        <bsdf type="diffuse">
+            <rgb value="0.043 0.58 0.184" name="reflectance"/>
+        </bsdf>
+    </bsdf>
+    <bsdf type="twosided" id="mat-itu_wet_ground">
+        <bsdf type="diffuse">
+            <rgb value="0.91 0.569 0.055" name="reflectance"/>
+        </bsdf>
+    </bsdf>
+    <emitter type="constant" id="World">
+        <rgb value="1.000000 1.000000 1.000000" name="radiance"/>
+    </emitter>
+    <sensor type="perspective" id="Camera">
+        <string name="fov_axis" value="x"/>
+        <float name="fov" value="42.854885"/>
+        <float name="principal_point_offset_x" value="0.000000"/>
+        <float name="principal_point_offset_y" value="-0.000000"/>
+        <float name="near_clip" value="0.100000"/>
+        <float name="far_clip" value="10000.000000"/>
+        <transform name="to_world">
+            <rotate x="1" angle="0"/>
+            <rotate y="1" angle="0"/>
+            <rotate z="1" angle="-90"/>
+            <translate value="0 0 100"/>
+        </transform>
+        <sampler type="independent">
+            <integer name="sample_count" value="$spp"/>
+        </sampler>
+        <film type="hdrfilm">
+            <integer name="width" value="$resx"/>
+            <integer name="height" value="$resy"/>
+        </film>
+    </sensor>
+    <shape type="ply" id="mesh-ground">
+        <string name="filename" value="mesh/ground.ply"/>
+        <ref id="mat-itu_wet_ground" name="bsdf"/>
+        <boolean name="face_normals" value="true"/>
+    </shape>
+    <shape type="ply" id="mesh-building_0">
+        <string name="filename" value="mesh/building_0.ply"/>
+        <ref id="mat-itu_marble" name="bsdf"/>
+        <boolean name="face_normals" value="true"/>
+    </shape>
+    <shape type="ply" id="mesh-building_1">
+        <string name="filename" value="mesh/building_1.ply"/>
+        <ref id="mat-itu_marble" name="bsdf"/>
+        <boolean name="face_normals" value="true"/>
+    </shape>
+    <shape type="ply" id="mesh-building_2">
+        <string name="filename" value="mesh/building_2.ply"/>
+        <ref id="mat-itu_marble" name="bsdf"/>
+        <boolean name="face_normals" value="true"/>
+    </shape>
+    <shape type="ply" id="mesh-building_3">
+        <string name="filename" value="mesh/building_3.ply"/>
+        <ref id="mat-itu_marble" name="bsdf"/>
+        <boolean name="face_normals" value="true"/>
+    </shape>
+    <shape type="ply" id="mesh-building_4">
+        <string name="filename" value="mesh/building_4.ply"/>
+        <ref id="mat-itu_marble" name="bsdf"/>
+        <boolean name="face_normals" value="true"/>
+    </shape>
+    <shape type="ply" id="mesh-building_5">
+        <string name="filename" value="mesh/building_5.ply"/>
+        <ref id="mat-itu_marble" name="bsdf"/>
+        <boolean name="face_normals" value="true"/>
+    </shape>
+    <shape type="ply" id="mesh-building_6">
+        <string name="filename" value="mesh/building_6.ply"/>
+        <ref id="mat-itu_marble" name="bsdf"/>
+        <boolean name="face_normals" value="true"/>
+    </shape>
+    <shape type="ply" id="mesh-building_7">
+        <string name="filename" value="mesh/building_7.ply"/>
+        <ref id="mat-itu_marble" name="bsdf"/>
+        <boolean name="face_normals" value="true"/>
+    </shape>
+    <shape type="ply" id="mesh-building_8">
+        <string name="filename" value="mesh/building_8.ply"/>
+        <ref id="mat-itu_marble" name="bsdf"/>
+        <boolean name="face_normals" value="true"/>
+    </shape>
+    <shape type="ply" id="mesh-building_9">
+        <string name="filename" value="mesh/building_9.ply"/>
+        <ref id="mat-itu_marble" name="bsdf"/>
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+    </shape>
+    <shape type="ply" id="mesh-building_10">
+        <string name="filename" value="mesh/building_10.ply"/>
+        <ref id="mat-itu_marble" name="bsdf"/>
+        <boolean name="face_normals" value="true"/>
+    </shape>
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+        <string name="filename" value="mesh/building_11.ply"/>
+        <ref id="mat-itu_marble" name="bsdf"/>
+        <boolean name="face_normals" value="true"/>
+    </shape>
+    <shape type="ply" id="mesh-building_12">
+        <string name="filename" value="mesh/building_12.ply"/>
+        <ref id="mat-itu_marble" name="bsdf"/>
+        <boolean name="face_normals" value="true"/>
+    </shape>
+    <shape type="ply" id="mesh-building_13">
+        <string name="filename" value="mesh/building_13.ply"/>
+        <ref id="mat-itu_marble" name="bsdf"/>
+        <boolean name="face_normals" value="true"/>
+    </shape>
+    <shape type="ply" id="mesh-building_14">
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+        <ref id="mat-itu_marble" name="bsdf"/>
+        <boolean name="face_normals" value="true"/>
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+    <shape type="ply" id="mesh-building_15">
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+        <ref id="mat-itu_marble" name="bsdf"/>
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+    </shape>
+    <shape type="ply" id="mesh-building_16">
+        <string name="filename" value="mesh/building_16.ply"/>
+        <ref id="mat-itu_marble" name="bsdf"/>
+        <boolean name="face_normals" value="true"/>
+    </shape>
+    <shape type="ply" id="mesh-building_17">
+        <string name="filename" value="mesh/building_17.ply"/>
+        <ref id="mat-itu_marble" name="bsdf"/>
+        <boolean name="face_normals" value="true"/>
+    </shape>
+    <shape type="ply" id="mesh-building_18">
+        <string name="filename" value="mesh/building_18.ply"/>
+        <ref id="mat-itu_marble" name="bsdf"/>
+        <boolean name="face_normals" value="true"/>
+    </shape>
+    <shape type="ply" id="mesh-building_19">
+        <string name="filename" value="mesh/building_19.ply"/>
+        <ref id="mat-itu_marble" name="bsdf"/>
+        <boolean name="face_normals" value="true"/>
+    </shape>
+    <shape type="ply" id="mesh-building_20">
+        <string name="filename" value="mesh/building_20.ply"/>
+        <ref id="mat-itu_marble" name="bsdf"/>
+        <boolean name="face_normals" value="true"/>
+    </shape>
+    <shape type="ply" id="mesh-building_21">
+        <string name="filename" value="mesh/building_21.ply"/>
+        <ref id="mat-itu_marble" name="bsdf"/>
+        <boolean name="face_normals" value="true"/>
+    </shape>
+    <shape type="ply" id="mesh-building_22">
+        <string name="filename" value="mesh/building_22.ply"/>
+        <ref id="mat-itu_marble" name="bsdf"/>
+        <boolean name="face_normals" value="true"/>
+    </shape>
+    <shape type="ply" id="mesh-building_23">
+        <string name="filename" value="mesh/building_23.ply"/>
+        <ref id="mat-itu_marble" name="bsdf"/>
+        <boolean name="face_normals" value="true"/>
+    </shape>
+    <shape type="ply" id="mesh-building_24">
+        <string name="filename" value="mesh/building_24.ply"/>
+        <ref id="mat-itu_marble" name="bsdf"/>
+        <boolean name="face_normals" value="true"/>
+    </shape>
+    <shape type="ply" id="mesh-building_25">
+        <string name="filename" value="mesh/building_25.ply"/>
+        <ref id="mat-itu_marble" name="bsdf"/>
+        <boolean name="face_normals" value="true"/>
+    </shape>
+    <shape type="ply" id="mesh-building_26">
+        <string name="filename" value="mesh/building_26.ply"/>
+        <ref id="mat-itu_marble" name="bsdf"/>
+        <boolean name="face_normals" value="true"/>
+    </shape>
+    <shape type="ply" id="mesh-building_27">
+        <string name="filename" value="mesh/building_27.ply"/>
+        <ref id="mat-itu_marble" name="bsdf"/>
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+    <shape type="ply" id="mesh-building_28">
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+        <ref id="mat-itu_marble" name="bsdf"/>
+        <boolean name="face_normals" value="true"/>
+    </shape>
+</scene>
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--- /dev/null
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+<?xml version="1.0" ?>
+<scene version="2.1.0">
+    <default name="spp" value="4096"/>
+    <default name="resx" value="1024"/>
+    <default name="resy" value="768"/>
+    <integrator type="path">
+        <integer name="max_depth" value="12"/>
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+    <bsdf type="twosided" id="mat-itu_concrete">
+        <bsdf type="diffuse">
+            <rgb value="0.539479 0.539479 0.53948" name="reflectance"/>
+        </bsdf>
+    </bsdf>
+    <bsdf type="twosided" id="mat-itu_marble">
+        <bsdf type="diffuse">
+            <rgb value="0.701101 0.644479 0.48515" name="reflectance"/>
+        </bsdf>
+    </bsdf>
+    <bsdf type="twosided" id="mat-itu_metal">
+        <bsdf type="diffuse">
+            <rgb value="0.219526 0.219526 0.254152" name="reflectance"/>
+        </bsdf>
+    </bsdf>
+    <bsdf type="twosided" id="mat-itu_wood">
+        <bsdf type="diffuse">
+            <rgb value="0.043 0.58 0.184" name="reflectance"/>
+        </bsdf>
+    </bsdf>
+    <bsdf type="twosided" id="mat-itu_wet_ground">
+        <bsdf type="diffuse">
+            <rgb value="0.91 0.569 0.055" name="reflectance"/>
+        </bsdf>
+    </bsdf>
+    <emitter type="constant" id="World">
+        <rgb value="1.000000 1.000000 1.000000" name="radiance"/>
+    </emitter>
+    <sensor type="perspective" id="Camera">
+        <string name="fov_axis" value="x"/>
+        <float name="fov" value="42.854885"/>
+        <float name="principal_point_offset_x" value="0.000000"/>
+        <float name="principal_point_offset_y" value="-0.000000"/>
+        <float name="near_clip" value="0.100000"/>
+        <float name="far_clip" value="10000.000000"/>
+        <transform name="to_world">
+            <rotate x="1" angle="0"/>
+            <rotate y="1" angle="0"/>
+            <rotate z="1" angle="-90"/>
+            <translate value="0 0 100"/>
+        </transform>
+        <sampler type="independent">
+            <integer name="sample_count" value="$spp"/>
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+        <film type="hdrfilm">
+            <integer name="width" value="$resx"/>
+            <integer name="height" value="$resy"/>
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+    <shape type="ply" id="mesh-ground">
+        <string name="filename" value="mesh/ground.ply"/>
+        <ref id="mat-itu_wet_ground" name="bsdf"/>
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+        <ref id="mat-itu_marble" name="bsdf"/>
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+        <ref id="mat-itu_marble" name="bsdf"/>
+        <boolean name="face_normals" value="true"/>
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+        <ref id="mat-itu_marble" name="bsdf"/>
+        <boolean name="face_normals" value="true"/>
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+    <shape type="ply" id="mesh-building_12">
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+        <ref id="mat-itu_marble" name="bsdf"/>
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+        <string name="filename" value="mesh/building_13.ply"/>
+        <ref id="mat-itu_marble" name="bsdf"/>
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+    </shape>
+    <shape type="ply" id="mesh-building_14">
+        <string name="filename" value="mesh/building_14.ply"/>
+        <ref id="mat-itu_marble" name="bsdf"/>
+        <boolean name="face_normals" value="true"/>
+    </shape>
+    <shape type="ply" id="mesh-building_15">
+        <string name="filename" value="mesh/building_15.ply"/>
+        <ref id="mat-itu_marble" name="bsdf"/>
+        <boolean name="face_normals" value="true"/>
+    </shape>
+    <shape type="ply" id="mesh-building_16">
+        <string name="filename" value="mesh/building_16.ply"/>
+        <ref id="mat-itu_marble" name="bsdf"/>
+        <boolean name="face_normals" value="true"/>
+    </shape>
+    <shape type="ply" id="mesh-building_17">
+        <string name="filename" value="mesh/building_17.ply"/>
+        <ref id="mat-itu_marble" name="bsdf"/>
+        <boolean name="face_normals" value="true"/>
+    </shape>
+    <shape type="ply" id="mesh-building_18">
+        <string name="filename" value="mesh/building_18.ply"/>
+        <ref id="mat-itu_marble" name="bsdf"/>
+        <boolean name="face_normals" value="true"/>
+    </shape>
+    <shape type="ply" id="mesh-building_19">
+        <string name="filename" value="mesh/building_19.ply"/>
+        <ref id="mat-itu_marble" name="bsdf"/>
+        <boolean name="face_normals" value="true"/>
+    </shape>
+    <shape type="ply" id="mesh-building_20">
+        <string name="filename" value="mesh/building_20.ply"/>
+        <ref id="mat-itu_marble" name="bsdf"/>
+        <boolean name="face_normals" value="true"/>
+    </shape>
+    <shape type="ply" id="mesh-building_21">
+        <string name="filename" value="mesh/building_21.ply"/>
+        <ref id="mat-itu_marble" name="bsdf"/>
+        <boolean name="face_normals" value="true"/>
+    </shape>
+    <shape type="ply" id="mesh-building_22">
+        <string name="filename" value="mesh/building_22.ply"/>
+        <ref id="mat-itu_marble" name="bsdf"/>
+        <boolean name="face_normals" value="true"/>
+    </shape>
+    <shape type="ply" id="mesh-building_23">
+        <string name="filename" value="mesh/building_23.ply"/>
+        <ref id="mat-itu_marble" name="bsdf"/>
+        <boolean name="face_normals" value="true"/>
+    </shape>
+</scene>