cmake PTex examples

PixarAnimationStudios/OpenSubdiv CMakeLists.txt :392 

find_package(PTex 2.0)

szellmann/visionaray src/common/CMakeLists.txt :95 

find_package(Ptex)

lighttransport/tinyusdz src/osd/CMakeLists.txt :362 

find_package(PTex 2.0)

ospray/hdospray hdOSPRay/CMakeLists.txt :121 

find_package(ptex CONFIG REQUIRED)