fix build with openvdb_vendor

Author: borongyuan

3rdparty/find_dependencies.cmake

@@ -55,6 +55,7 @@ if(USE_SYSTEM_OPENVDB)
   list(APPEND CMAKE_MODULE_PATH "${CMAKE_INSTALL_FULL_LIBDIR}/cmake/OpenVDB")
   find_package(openvdb_vendor QUIET)
   if(NOT OpenVDB_FOUND)
+    list(APPEND CMAKE_MODULE_PATH "${PROJECT_SOURCE_DIR}/cmake/")
     find_package(OpenVDB QUIET)
   endif()
   if(OpenVDB_FOUND AND OpenVDB_USES_BLOSC)

CMakeLists.txt

@@ -54,7 +54,6 @@ set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
 set(CMAKE_POSITION_INDEPENDENT_CODE ON)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 set(CMAKE_CXX_EXTENSIONS OFF)
-set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${PROJECT_SOURCE_DIR}/cmake/")
 
 # Find Dependencies from the 3rdparty directory.
 include(3rdparty/find_dependencies.cmake)