Prise3D/p3d_pbrt-v4-scenes: PBRT v4 scenes for SIN3D @ 801e696edc9611e2ef1f42b24636c56e011b20d0

Matt Pharr 02708382b8 Update scenes to use "iso" rather than "scale" for Film		3 lat temu
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geometry	449d32c872 Add sssdragon scene	3 lat temu
textures	449d32c872 Add sssdragon scene	3 lat temu
dragon_10.pbrt	02708382b8 Update scenes to use "iso" rather than "scale" for Film	3 lat temu
dragon_250.pbrt	02708382b8 Update scenes to use "iso" rather than "scale" for Film	3 lat temu
dragon_50.pbrt	02708382b8 Update scenes to use "iso" rather than "scale" for Film	3 lat temu