This is car.dat from the standard LDraw distribution, rendered with PRMan 12.5, using the output from:

    l2rib -studlogo -cameradistance 1.25 -camerafrom -0.75 -0.5 -0.5 -floor 3 -pixelsamples 13 -shadingrate 1 \
        -light -2 -10 -30 1 0.5 0.5 1.2 raytrace \
        -light -30 -10 -2 1.0 1.0 1.0 1.8 raytrace \
        -light 30 -30 30 0.5 0.5 1.0 0.5 none \
        -shadingrate 10 dat/car.dat
  

The resulting RIB file was modified by adding an indirect diffuse light shader - note the (very subtle) color bleeding effects onto the ground floor.

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