I had tried to show display coordinate bounds of the 3D model in the article VTK: Show Display Bounds. But the result is not good enough because the process that transforms the world coordinate point to display the coordinate point can generate error as we rotate the camera. So I Read more…
Here is a curve in the 3D scene, the sphere represents its center. I want to find the axes of the 3D model just as vtkOBBTree, relative article: Explore The Orientation Of 3D Object. But all points on the curve are in the same plane, so neither vtkOBBTree nor vtkHull Read more…
We can generate different 3D models of string in the page Create 3D Text. All fonts are free for individuals and business use. They come from the website https://ziyouziti.com. You can visit it if you are interested in these fonts. I will display the general effect of these fonts in Read more…
I planed to show the 3D model’s bounds in the display coordinate and update it if the user rotates and zooms in/out in real-time. I’m curious about if the display bounds touch with the 3D model. The display bounds are shown as a red rectangle in the render window, our Read more…
We often use vtkPropPicker to judge which 2D actor had been picked, but the solution doesn’t work in the Mac software Parallels. So we have to create a new method to found the 2D actor which had been picked. There are two situations in my problem. The actor2D takes vtkImageMapper Read more…
We have a vtkTextActor object in the render window now. How to put it at the right-top corner or the left-bottom corner in the render window according to the render and text rectangle’s size? The following code snippet shows the different scenes described above. #include <iostream> #include <vtkSmartPointer.h> #include <vtkSphereSource.h> Read more…
The story happened after the Zhou Dynasty end in ancient China. The Qin Dynasty became a powerful empire from a small state after the Reforms of Shang Yang. The new rules rewarded farmers and soldiers if they meet the government policies, punishment the people who broken the law even if Read more…
There is a massive module in my project, it computes many data tasks, update UI, and is responsible for interaction style. I want to move the user interaction part to another viewer class, make the old module more lightweight. The structure of the module class looks like the following snippet. Read more…
This is a story about Lv Buwei, prime minister of the Chinese Qin dynasty. Why did he decide to become a government official from a businessman? In 285 BCE, the five states Yan, Qin, Han, Zhao, and Wei formed an alliance and declared a war on the state Qi because Read more…