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Visualisation of Grid / SciDAC format density fields using VTK (visualisation toolkit). Peter Boyle, 2025.
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Uses:
https://vtk.org
Files are, for example, those produced by
Grid/HMC/ComputeWilsonFlow.cc
and
Grid/HMC/site_plaquette.cc
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Prerequisites:
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1) Install ffmpeg-7.0.2 (developer install, includes headers and libraries).
MacOS note: must install ffmpeg from source -- homebrew only installs binaries.
https://ffmpeg.org/download.html#releases
Note: the latest ffmpeg (7.1.1) broke software compatibility with VTK.
2) Build and install VTK-9.4.2, with FFMEG support enabled.
This is particularly involved on MacOS, so documented here.
cd VTK-9.4.2
mkdir build
cd build
ccmake ..
Using cmake editor, set:
FFMPEG_DIR /usr/local
toggle "advanced mode"
CMAKE_EXE_LINKER_FLAGS to:
-framework Foundation -framework AudioToolbox -framework CoreAudio -liconv -lm -framework AVFoundation -framework CoreVideo -framework CoreMedia -framework CoreGraphics -framework AudioToolbox -framework OpenGL -framework OpenGL -framework VideoToolbox -framework CoreImage -framework AppKit -framework CoreFoundation -framework CoreServices -lz -lbz2 -Wl,-framework,CoreFoundation -Wl,-framework,Security -L/usr/local/lib -lavdevice -lavfilter -lavformat -lavcodec -lswresample -lswscale -lavutil
Set paths for each of
FFMPEG_DIR /usr/local
FFMPEG_avcodec_INCLUDE_DIR /usr/local/include
FFMPEG_avcodec_LIBRARY /usr/local/lib/libavcodec.a
FFMPEG_avdevice_INCLUDE_DIR /usr/local/include
FFMPEG_avdevice_LIBRARY /usr/local/lib/libavdevice.a
FFMPEG_avfilter_INCLUDE_DIR /usr/local/include
FFMPEG_avfilter_LIBRARY /usr/local/lib/libavfilter.a
FFMPEG_avformat_INCLUDE_DIR /usr/local/include
FFMPEG_avformat_LIBRARY /usr/local/lib/libavformat.a
FFMPEG_avresample_INCLUDE_DIR /usr/local/include
FFMPEG_avresample_LIBRARY /usr/local/lib/libavresample.a
FFMPEG_avutil_INCLUDE_DIR /usr/local/include
FFMPEG_avutil_LIBRARY /usr/local/lib/libavutil.a
FFMPEG_swresample_INCLUDE_DIR /usr/local/include
FFMPEG_swresample_LIBRARY /usr/local/lib/libswresample.a
FFMPEG_swscale_INCLUDE_DIR /usr/local/include
FFMPEG_swscale_LIBRARY /usr/local/lib/libswscale.a
VTK_MODULE_ENABLE_VTK_IOFFMPEG YES
VTK really should make it easier to pick up the flags required for FFMPEG linkage, especially as they are very quirky on MacOS.
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Grid:
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3) Build and install a version of Grid
4) Ensure "grid-config" is in your path.
5) cd Grid/visualisation/
libs=`grid-config --libs`
ldflags=`grid-config --ldflags`
cxxflags=`grid-config --cxxflags`
cxx=`grid-config --cxx`
mkdir build
cd build
LDFLAGS="$ldflags $libs " cmake .. -DCMAKE_CXX_COMPILER=$cxx -DCMAKE_CXX_FLAGS=$cxxflags
make
6) Invoke as:
FieldDensityAnimate --isosurface <float-from-0-to-5> --grid X.Y.Z.T --file1 SciDacDensityFile1 [--xlate] [--mpeg]
FieldDensityAnimate --isosurface <float-from-0-to-5> --grid X.Y.Z.T --file1 SciDacDensityFile1 --file2 SciDacDensityFile2 [--xlate] [--mpeg]
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Extensions
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7) Direct calling from Grid ?:
Not yet implemented, but could develop sufficient interface to write a Lattice scalar field into MPEG direct from running code.
8) Example python code: FieldDensity.py . This is not interfaced to Grid.