Update ImageClip and ImageRegion

• use parallel projection camera instead of perspective camera to avoid inaccurate xy positions caused by different z values of border widget and image actor

the coordinates of border widget's lower left and upper right corners have different z value with the image actor, which will cause a mismatch of xy values in perspective mode, and the simplest way is just setting the camera to be parallel projection mode.

1. Including: #include <vtkCamera.h> will make the build work in both cases.
2. Can you please modify the markdown files adding the reason for using parallel projection. In ImageRegion.md remove the last line since the image picking is working now.
3. I am not seeing images similar to the test images for some reason.
   • In ImageClip I expected to see the selected region in the right renderer.
   • In ImageRegion I just see a green square in the upper right of the window.

added 1 commit

• d84cacd9 - Update ImageClip and ImageRegion

Compare with previous version

resolved all threads

You need to generate a new test image for ImageClip.cxx

Go to your build folder for vtk-examples and run:

ctest -R ImageClip

Then replace the image in vtk-examples/src/Testing/Baseline/Cxx/Interaction/ with the new image.

added 1 commit

• f07406df - Replace TestImageClip.png

Compare with previous version

resolved all threads

There seems to be an issue with this MR, you need to rune the merge request pipeline and fix any errors.

I just saw that the pipeline failed. Please try rebasing the master onto your branch.

i really do not understand why the pipeline always failed to build vtk

added 39 commits

• f07406df...0e9537c1 - 38 commits from branch vtk:master
• 3d85664e - Merge branch vtk-examples:master into master

Compare with previous version

Hi @Harold2017

Looks like your fork is not correctly setup, please follow this guide: https://discourse.vtk.org/t/the-ultimate-how-to-make-ci-work-with-my-fork-guide/7581

ok, i will close this mr first

it still failed and may be due to the single runner is not available before timeout?

Closing your MR is not required.

Looks like you deleted your fork ?

yes, because i did not find any diff in the settings between the old fork and your link. i thought a new fork may be more suitable, but seems not.. since the PR is very simple, i'd better close my MRs and maybe you can fix it?

closed