Very basic OpenCASCADE examples. The purpose of these tiny example programs is to show the most basic usage of the Open CASCADE 3D library possible, thus flattening the learning curve for a beginner (like me).

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Arno Wilhelm 57ed925894 Exports to step file format now too.		7 years ago
docs	9fd53f4aab Added pictures of the basic shapes to documentation.	7 years ago
src	57ed925894 Exports to step file format now too.	7 years ago
LICENSE	55724893e4 Initial commit	7 years ago
README.md	c4d31a32d7 Added .stp file format and FreeCAD website.	7 years ago
TODO.md	24adcdfe65 Added example on how to find symbols in libraries in order to add these to Makefile	7 years ago

occBasicSamples

Very basic OpenCASCADE examples that compile on Linux on the commandline with g++. A .stl, .wrl and .stp file is written into a file which can be imported and viewed by a program like blender, MeshLab, FreeCAD or view3dscene for example. The purpose of these tiny example programs is to show the most basic usage of the Open CASCADE 3D library possible, thus flattening the learning curve for a beginner (like me).

Installation

Debian 8.9 (jessie) was used as operating system.

OpenCascade (https://www.opencascade.com/doc/occt-7.1.0/overview/html/occt_dev_guides__building.html)
- Building 3rd party libraries (https://www.opencascade.com/doc/occt-7.1.0/overview/html/occt_dev_guides__building_3rdparty_linux.html): root> apt-get install g++ cmake cmake-curses-gui root> apt-get install tcllib tklib tcl-dev tk-dev libfreetype-dev libxt-dev libxmu-dev libxi-dev libgl1-mesa-dev libglu1-mesa-dev libfreeimage-dev libtbb-dev libgl2ps-dev root> apt-get install doxygen graphviz root> apt-get install libqt4-dev libvtk6-dev libvtk6-qt-dev
- Download OpenCascade from https://www.opencascade.com/content/latest-release. You must create an account in order to do so.
- Configure (https://www.opencascade.com/doc/occt-7.1.0/overview/html/occt_dev_guides__building_cmake.html): user> mkdir opencascade user> cd opencascade/ user> cp ~/Downloads/opencascade-7.1.0.tgz . user> tar -xvzf opencascade-7.1.0.tgz user> mkdir install user> mkdir build
- remove the lines containing "vtkRenderingFreeTypeOpenGL" from the files TKIVtk/EXTERNLIB and TKIVtkDraw/EXTERNLIB or u will get an linker error ( see: https://www.opencascade.com/content/compataility-latest-versions-vtk) user> fgrep -irns vtkRenderingFreeTypeOpenGL ../opencascade-7.1.0/src/ ../opencascade-7.1.0/src/TKIVtk/EXTERNLIB:17:vtkRenderingFreeTypeOpenGL ../opencascade-7.1.0/src/TKIVtkDraw/EXTERNLIB:23:vtkRenderingFreeTypeOpenGL user> cd build && ccmake ../opencascade-7.1.0/
  - Adapt and configure the variables as you need them.
  - Press the c key several times in order to solve all dependencies and generate the makefiles with the g-key then.
  - Here is what i have changed: > INSTALL_DIR ../install
    > 3RDPARTY_SKIP_DOT_EXECUTABLE OFF > INSTALL_DOC_Overview ON
    > INSTALL_FREETYPE ON
    > INSTALL_SAMPLES ON
    > INSTALL_TCL ON
    > INSTALL_TEST_CASES ON
    > INSTALL_TK ON
    > USE_FREEIMAGE ON
    > USE_GL2PS ON
    > USE_TBB ON
    > USE_VTK ON
- Compile: user> make
- Install:
  - Link tcl8.6 to tcl8 if you get an that errormessage that tcl8 cannot be found: root> ln -s /usr/lib/x86_64-linux-gnu/tcl8.6/ /usr/lib/x86_64-linux-gnu/tcl8 user> make install
- Add the OpenCascade libraries to your library path: root> cd /etc/ld.so.conf.d/ root> echo '/path_to/opencascade/install/lib' > opencascade.conf root> ldconfig
occBasicSamples user> git clone https://github.com/quirxi/occBasicSamples.git user> cd occBasicSamples/src user> rm include lib path_to_OpenCascade_* user> ln -s ../../opencascade/install/lib/ lib user> ln -s ../../opencascade/install/include/ include user> cd Box user> make g++ -c -pipe -O3 -std=c++11 -Wall -W -g -D_REENTRANT -I../include/opencascade -o main.o main.cpp g++ -o aBox.exe main.o -L../lib -lTKernel -lTKPrim -lTKTopAlgo -lTKSTL -lTKVRML -lTKBRep -lTKG3d -lTKMesh user> ./aBox.exe user> ls -a . .. aBox.exe aBox.stl aBox.wrl main.cpp main.o Makefile