RotationAroundLine
Repository source: RotationAroundLine
Description¶
This example demonstrates how to rotate an object around an axis. For the demo, we rotate a cone 10 degrees around the y axis.
Question
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Code¶
RotationAroundLine.cxx
#include <vtkActor.h>
#include <vtkArrowSource.h>
#include <vtkNamedColors.h>
#include <vtkNew.h>
#include <vtkPolyDataMapper.h>
#include <vtkProperty.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkTransform.h>
#include <vtkTransformPolyDataFilter.h>
int main(int, char*[])
{
vtkNew<vtkNamedColors> colors;
// Create a rendering window and renderer.
vtkNew<vtkRenderer> ren;
vtkNew<vtkRenderWindow> renWin;
renWin->AddRenderer(ren);
renWin->SetSize(640, 480);
renWin->SetWindowName("RotationAroundLine");
// Create a renderwindowinteractor.
vtkNew<vtkRenderWindowInteractor> iren;
iren->SetRenderWindow(renWin);
// Create arrow
vtkNew<vtkArrowSource> source;
// Create a transform that rotates the arrow 45° around the z-axis.
vtkNew<vtkTransform> transform;
transform->RotateWXYZ(45, 0, 0, 1);
vtkNew<vtkTransformPolyDataFilter> transformFilter;
transformFilter->SetTransform(transform);
transformFilter->SetInputConnection(source->GetOutputPort());
transformFilter->Update();
// Mapper for the original arrow.
vtkNew<vtkPolyDataMapper> coneMapper1;
coneMapper1->SetInputConnection(source->GetOutputPort());
// Another mapper for the rotated arrow.
vtkNew<vtkPolyDataMapper> coneMapper2;
coneMapper2->SetInputConnection(transformFilter->GetOutputPort());
// Actor for original arrow.
vtkNew<vtkActor> actor1;
actor1->SetMapper(coneMapper1);
// Actor for rotated arrow.
vtkNew<vtkActor> actor2;
actor2->SetMapper(coneMapper2);
// Color the original arrow.
actor1->GetProperty()->SetColor(colors->GetColor3d("LightCoral").GetData());
// Color rotated arrow.
actor2->GetProperty()->SetColor(
colors->GetColor3d("PaleTurquoise").GetData());
// Assign actor to the renderer.
ren->AddActor(actor1);
ren->AddActor(actor2);
ren->SetBackground(colors->GetColor3d("SlateGray").GetData());
// Enable the user interface interactor.
iren->Initialize();
renWin->Render();
iren->Start();
return EXIT_SUCCESS;
}
CMakeLists.txt¶
cmake_minimum_required(VERSION 3.12 FATAL_ERROR)
project(RotationAroundLine)
find_package(VTK COMPONENTS
CommonColor
CommonCore
CommonTransforms
FiltersGeneral
FiltersSources
InteractionStyle
RenderingContextOpenGL2
RenderingCore
RenderingFreeType
RenderingGL2PSOpenGL2
RenderingOpenGL2
)
if (NOT VTK_FOUND)
message(FATAL_ERROR "RotationAroundLine: Unable to find the VTK build folder.")
endif()
# Prevent a "command line is too long" failure in Windows.
set(CMAKE_NINJA_FORCE_RESPONSE_FILE "ON" CACHE BOOL "Force Ninja to use response files.")
add_executable(RotationAroundLine MACOSX_BUNDLE RotationAroundLine.cxx )
target_link_libraries(RotationAroundLine PRIVATE ${VTK_LIBRARIES}
)
# vtk_module_autoinit is needed
vtk_module_autoinit(
TARGETS RotationAroundLine
MODULES ${VTK_LIBRARIES}
)
Download and Build RotationAroundLine¶
Click here to download RotationAroundLine and its CMakeLists.txt file. Once the tarball RotationAroundLine.tar has been downloaded and extracted,
cd RotationAroundLine/build
If VTK is installed:
cmake ..
If VTK is not installed but compiled on your system, you will need to specify the path to your VTK build:
cmake -DVTK_DIR:PATH=/home/me/vtk_build ..
Build the project:
make
and run it:
./RotationAroundLine
WINDOWS USERS
Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.