How ${BULLET_PHYSICS_SOURCE_DIR} is defined?

[yangli-flexiv]

I am using Ubuntu 18.04, and have run the build command:

./build_cmake_pybullet_double.sh
./premake4_linux64 --double gmake
cd gmake
make

When I tried to cd to HelloWorld example, and built the code:

mkdir build && cd build
cmake .. -DCMAKE_INSTALL_PREFIX=~/install -DBUILD_THIRDPARTY=ON
make

and I got error, saying that

fatal error: btBulletDynamicsCommon.h: No such file or directory
 #include "btBulletDynamicsCommon.h"

I checked the CMakeLists.txt file, and by printing out the INCLUDE_DIRECTORIES: ${BULLET_PHYSICS_SOURCE_DIR}/src, and I found that ${BULLET_PHYSICS_SOURCE_DIR} is not defined.

I don't know whether I need to run some other command to configure ${BULLET_PHYSICS_SOURCE_DIR}?

Thank you a lot!

[erwincoumans]

I think cmake defines that variable, if ran from the root directory.

./build_cmake_pybullet_double.sh
This should already build all the examples, you shouldn't need to build them again.

We use this to build Bullet from a different repo:

cmake  -DUSE_DOUBLE_PRECISION=ON -DCMAKE_DEBUG_POSTFIX="" -DINSTALL_LIBS=ON -DCMAKE_BUILD_TYPE=Release  -DCMAKE_INSTALL_PREFIX:PATH=local_install  ..
make -j4
make install

See also this simple cmake example:
https://github.com/erwincoumans/hello_bullet_cmake

[yangli-flexiv]

Hi @erwincoumans,

Thank you very much for your reply. I am not sure what you mean by root directory, this command build_cmake_pybullet_double.sh is located in the directory of bulletphysics. I guess you mean the root directory of this repo, instead of my computer?

Did you mean that when I ran ./build_cmake_pybullet_double.sh, I don't need to cd to each example and built them separately?

Thanks!