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Updates for OSL v1.14 #2204

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jstone-lucasfilm
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  • Call the new subsurface_bssrdf closure in OSL v1.14 and above, falling back to the original closure signature in earlier versions.
  • Call the new chiang_hair_bsdf closure in OSL v1.14 and above, falling back to a dielectric_bsdf approximation in earlier versions.
  • Inline the OSL implementations of displacement nodes for simplicity.
  • Update the minimum OSL and MDL versions in libraries documentation.

- Call the new subsurface_bssrdf closure in OSL v1.14 and above, falling back to the original closure signature in earlier versions.
- Call the new chiang_hair_bsdf closure in OSL v1.14 and above, falling back to a dielectric_bsdf approximation in earlier versions.
- Inline the OSL implementations of displacement nodes for simplicity.
- Update the minimum OSL and MDL versions in libraries documentation.
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Attaching a GLSL/OSL render comparison using the codebase in this PR:

MaterialXRenderTests_01_28_2025_GitHub.pdf

@jstone-lucasfilm jstone-lucasfilm merged commit fc388e4 into AcademySoftwareFoundation:main Jan 29, 2025
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