cmake find module -> CmakeLists.txt -> your project

1. Find modules. CMake provides a lot of find modules by default such as vtk. However you might still need to write your own ones. You need to get those include dirs and libs. Here is a tiny example for voro++.

# - Try to find voro++
# Once done this will define
#  VORO++_FOUND - System has voro++
#  VORO++_INCLUDE_DIRS - The voro++ include directories
#  VORO++_LIBRARIES - The libraries needed to use voro++
#  VORO++_DEFINITIONS - Compiler switches required for using voro++

find_package(PkgConfig)
pkg_check_modules(PC_VORO++ QUIET voro++)
set(VORO++_DEFINITIONS ${PC_VORO++_CFLAGS_OTHER})

find_path(VORO++_INCLUDE_DIR voro++.hh
          HINTS ${PC_VORO++_INCLUDEDIR} ${PC_VORO++_INCLUDE_DIRS}
          PATH_SUFFIXES voro++ )

find_library(VORO++_LIBRARY NAMES voro++
             HINTS ${PC_VORO++_LIBDIR} ${PC_VORO++_LIBRARY_DIRS} )

set(VORO++_LIBRARIES ${VORO++_LIBRARY} )
set(VORO++_INCLUDE_DIRS ${VORO++_INCLUDE_DIR} )

include(FindPackageHandleStandardArgs)
# handle the QUIETLY and REQUIRED arguments and set VORO++_FOUND to TRUE
# if all listed variables are TRUE
find_package_handle_standard_args(voro++  DEFAULT_MSG
                                  VORO++_LIBRARY VORO++_INCLUDE_DIR)

mark_as_advanced(VORO++_INCLUDE_DIR VORO++_LIBRARY )

2. Then you are going to add the modules above in your CMakeLists.txt.

cmake_minimum_required(VERSION 2.6.2)

PROJECT(vtk_tetrahedron)

if(NOT CMAKE_MODULE_PATH)
  set(CMAKE_MODULE_PATH)
endif()
list(APPEND CMAKE_MODULE_PATH /home/jesse/Jesse_Studio/cmake_find)
#        set(CMAKE_MODULE_PATH ${PROJECT_SOURCE_DIR}/cmake)
find_package(VTK REQUIRED)
include(${VTK_USE_FILE})

find_package(Eigen3 REQUIRED)
include_directories(${EIGEN3_INCLUDE_DIR})

find_package(Voro++ REQUIRED)
include_directories(${VORO++_INCLUDE_DIR})

add_executable(Tetrahedron Tetrahedron.cxx)

if(VTK_LIBRARIES)
    target_link_libraries(Tetrahedron ${VTK_LIBRARIES})
else()
    target_link_libraries(Tetrahedron vtkHybrid )
endif()

if(VORO++_LIBRARIES)
    target_link_libraries(Tetrahedron ${VORO++_LIBRARIES})
endif()

3. That's it. Use you cmake normally.