Prise3D/p3d_pbrt-v4-scenes: PBRT v4 scenes for SIN3D

Matt Pharr 02708382b8 Update scenes to use "iso" rather than "scale" for Film		4 lat temu
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bsdfs	01c5d8369f Add sportscar model.	4 lat temu
geometry	01c5d8369f Add sportscar model.	4 lat temu
textures	515a6ac5ae Add missing sportscar/textures/sky.exr file. Issue #2.	4 lat temu
materials.pbrt	01c5d8369f Add sportscar model.	4 lat temu
sportscar-area-lights.pbrt	02708382b8 Update scenes to use "iso" rather than "scale" for Film	4 lat temu
sportscar-sky.pbrt	02708382b8 Update scenes to use "iso" rather than "scale" for Film	4 lat temu