Assimp generates headers at compile time

[Binero]

Assimp generates config.h from config.h.in at compile time. When building cmake out of the source tree, this means config.h does not end up in the include/assimp directory at all.

On Visual Studio, all cmake projects build in %userprofile%\CMakeBuilds.

When using Assimp as a dependency, it's useful to have it in a git submodule. However, because config.h gets generated at compile time, and is not inserted into the source directory, any program using Assimp will fail to compile, because of the missing include.

The obvious solution would be to build Assimp in the source tree, but depending on the environment (e.g. Visual Studio) this is not always possible.

[mjgalindo]

This is kind of a repeat of #1566
You can get around it by including the build version of the assimp directory in the include directories for your project.

[Binero]

For future reference, anyone who has a similar situation like I do, if assimp is in the assimp directory of your source tree, the following cmake snippet should work:

find_package(assimp 4.1 QUIET)
if (NOT assimp_FOUND)
    message(STATUS "Assimp not installed. Compiling from source.")
    set(ASSIMP_BUILD_ASSIMP_TOOLS OFF)
    add_subdirectory ("assimp")
    set(assimp_INCLUDE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/assimp/include/" "${CMAKE_CURRENT_BINARY_DIR}/assimp/include/")
endif (NOT assimp_FOUND)