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OSX Mavericks Simulations appear to have no friction.
Posted: Tue Mar 25, 2014 12:44 pm
by jmacey
I'm getting some weird simulations with Bullet under mac osx, using either the bullet-2.82-r2704.tgz or the git repo.
I'm using clang++ -v
Apple LLVM version 5.1 (clang-503.0.38) (based on LLVM 3.4svn)
Target: x86_64-apple-darwin13.1.0
My demo works find on linux and another older mac book pro, however with the latest Macbook pro ( Processor 2.3 GHz Intel Core i7 NVIDIA GeForce GT 750M 2048 MB) I get what appears to be no friction in any of the demos.
For example the fork lift demo the block drops and then proceeds to slide into the screen, with my own demos all the rigid bodies seem to spin out of control and never come to rest.
A movie of these problems can be seen
http://youtu.be/i-fgATMTpw4.
I've also had some link errors to do with Symbol not found: ___sincosf_stret but have fixed them using -mmacosx-version-min=10.8 does anyone have a clue what is causing this as I can't figure it out.
Re: OSX Mavericks Simulations appear to have no friction.
Posted: Tue Mar 25, 2014 1:39 pm
by jmacey
A quick update,
just built the demos using xcode and all works well, my version was built using cmake (and my own demos using qmake / Qt Creator) so it seems to be a compile option / flag issue with cmake.
For now I have copied the libs created by xcode into /usr/local/lib and renamed them to remove the _xcode4_debug and it all seems to work.
Is this an issue with the cmake version of the build?
Re: OSX Mavericks Simulations appear to have no friction.
Posted: Tue Apr 15, 2014 2:41 am
by dl83
Ah, glad to know I'm not the only one
Would be curious to know what's causing this!
Re: OSX Mavericks Simulations appear to have no friction.
Posted: Tue Apr 15, 2014 3:43 pm
by LtBrick
I wonder if this is causing my issues too, "Ball Physics not working as expected."
http://www.bulletphysics.org/Bullet/php ... f=9&t=9890
I haven't tried the demos yet, but friction in my model doesn't seem to behave properly. I built the library using cmake on my iMac running mavericks. Will have to try rebuilding them with Xcode and see if that works.
Re: OSX Mavericks Simulations appear to have no friction.
Posted: Tue Apr 15, 2014 4:13 pm
by jmacey
Not looked at this for a while but their is a huge difference in compiler flags from the Xcode and the CMake versions, removing all the -I path elements
Xcode
Code: Select all
clang -x c++ -arch x86_64 -fmessage-length=0
-fdiagnostics-show-note-include-stack -fmacro-backtrace-limit=0
-std=gnu++11 -Wno-trigraphs -fno-rtti -fpascal-strings
-O0 -Wno-missing-field-initializers -Wno-missing-prototypes -Wno-non-virtual-dtor
-Wno-overloaded-virtual -Wno-exit-time-destructors -Wno-missing-braces
-Wparentheses -Wswitch -Wno-unused-function -Wno-unused-label
-Wno-unused-parameter -Wunused-variable -Wunused-value -Wno-empty-body
-Wno-uninitialized -Wno-unknown-pragmas -Wno-shadow -Wno-four-char-constants
-Wno-conversion -Wno-constant-conversion -Wno-int-conversion -Wno-bool-conversion
-Wno-enum-conversion -Wno-shorten-64-to-32 -Wno-newline-eof -Wno-c++11-extensions
-isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk
-fasm-blocks -fstrict-aliasing -Wdeprecated-declarations -Winvalid-offsetof -mmacosx-version-min=10.9 -g
-Wno-sign-conversion
Cmake
Code: Select all
/usr/bin/c++ -DUSE_GRAPHICAL_BENCHMARK -O3 -DNDEBUG
I'guessing one of the flags above changes something in the Library to make it work or not
Re: OSX Mavericks Simulations appear to have no friction.
Posted: Sun Apr 27, 2014 12:51 am
by Erwin Coumans
I can reproduce the issue with Clang and will have a look at fixing it in the new github repo.
https://github.com/bulletphysics/bullet3/issues/164
Thanks for the report,
Erwin