bug fix for plastic material

mmp / pbrt-v3

Source code for pbrt, the renderer described in the third edition of "Physically Based Rendering: From Theory To Implementation", by Matt Pharr, Wenzel Jakob, and Greg Humphreys.

http://pbrt.org

BSD 2-Clause "Simplified" License

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bug fix for plastic material #321

Closed Chaphlagical closed 2 years ago

Chaphlagical commented 2 years ago

FresnelDielectric from plastic material should be etaI = 1.0 and etaT = 1.5

Chaphlagical commented 2 years ago

Original: before

Fixed: after