If you have used vtkImageActor or vtkImageMapper + vtkActor2D to display an image in VTK renderer window, you can change the value of ColorLevel of vtkImageMapper to adjust the exposure to get a better effect. As the ColorLevel value increases, the exposure decreases while the ColorWindow value remains constant.
Here is a simple example about make vtkImageActor always face current active camera and keep it under a vtkFollower object. It’s impossible to send image data to vtkFollower directly, so we have to add the feature that adjust orientation of image actor automatically when rendering. To keep the lower status, Read more…
We can find that vtkImageActor object will display image with controling its position with the bottom left corner of the image by the default way. Test project: Result: How to make the image’s center as actor’s position? Just as rewrite 3D model to make center as (0,0,0), related post: https://www.weiy.city/2022/01/rewrite-file-to-move-3d-model-to-origin-point/ Read more…
The post shows a way to remesh a model to make uneven triangles on the mesh to be more uniform. The 3D model file locker.stl can be downloaded at the page:https://www.weiy.city/downloads/3d-model-simple-lock/ . Compare the original mesh and the new data in paraview:
I found an interesting issue about vtkSDL2OpenGLRenderWindow::SetSize when changed canvas for VTK WASM 3D window.The related post on the website is Change Canvas For VTK WASM Project. The interface SetSize can work if it was used before m_RenderWindowInteractor->SetRenderWindow( newWin );.It means the 3D window will become smaller or bigger than the outer shell. The red object Read more…
Environment:VTK Branch_v9.1.0emcc (Emscripten gcc/clang-like replacement + linker emulating GNU ld) 3.1.39 I tested two interfaces for pick operation of vtkPropPicker on web page. The result value is awalys 0. Invoking code: There are warning on browser log: Maybe that’s a bug of VTK For WebAssembly. All source code has been Read more…
Sometimes we need to change canvas for VTK WASM 3D window.Updating renderer window and renderer is neccessary if we don’t restart all data loading.The related post is Change Canvas For VTK WASM Project. I got the following error info on the web page if do vtkSDL2OpenGLRenderWindow::Render before m_RenderWindow = newWin; (update the old rendererWindow variable). Read more…
The interface vtkAbstractPicker::AddPickList is used to add an object to the bottom of the list. But it will not check adding the same object to the list. So the number of items in the pick list will increase if we add the item multiple times. Source code for the interface:
Create a sphere and use a plane to cut it to generate a big hole. This is our test data. Then we will fill the hole by inserting a center point of the boundary and creating new triangle cells to form a new surface. We will use ConnectedEdgeFilter.hpp to handles Read more…