Pyvista

New Features

- Huge Refactor of `QtInteractor` to improve stability of `BackgroundPlotter` (603, 619).
- Rename extract edges filters (610)
- Exposing tip resolution in `pyvista.Arrow` (624)

Squashed Bugs

- Minor doc fixes (616)
- Disabled depth peeling by default (618)
- Fix increment point size (609)
- Disabled rendering on close (638)

Behind the scenes & MISC

- Using Azure Devops for testing. We made this decision to keep all the testing in one place for Linux, Mac OS, and Windows.
- Added Mac OS CI testing. Azure made this easy.
- Added a development docs website at https://dev.pyvista.org/. Anything merged with Master will show up here. Docs are only updated to https://docs.pyvista.org when a release is created
- Printed directions for movie example.
- Using `meshio>=4.0.0`

Contributors

Thanks to all those who contributed PRs for this release. Ping me if I missed you, because there was a lot this time around.

- adeak
- keurfonluu
- GuillaumeFavelier
- banesullivan
- RubendeBruin
- imsodin
- tkoyama010

New Contributors

Be sure to welcome and thank these folks for their contributions!

- tkoyama010
- MatthewFlamm
- math-artist

New Features

- New experimental plotter class with [`itkwidgets`](https://github.com/InsightSoftwareConsortium/itkwidgets) for interactive Jupyter Notebook plotting (see #389)
- Add file drag ’n’ drop to `BackgroundPlotter` (see 567)
- New `extract_subset` filter for `UniformGrid` (see 569)
- New GPU details in `Report` (see 512)
- New text slider widget (see 518)
- Enable depth peeling by default (see 529)
- New sample over line filter (see 525)
- New checkbox button widget (see 528)
- Refactor axes widget to be on any renderer in subplots (see 536 and 565)
- Refactor `BasePlotter`’s wrapping of `Renderer` to improve interface and docs (see 552)
- Improve `meshio` support and enable `meshio` objects to be passed to PyVista (see 559 and 568)
- Improve repr for camera position (see 537)
- Updates to visible cell selecting (see 571)
- Add original point IDs to `geodesic` filter (see 544)

Squashed Bugs

- Fix slider widget coordinate parameters (see 511)
- Fix mesh name issues that prevented plotting in `for`-loops (see 521)
- Fix issues when instantiating `RectilinearGrid` (see 530)
- Fix brown plotting color (see 538)
- Fixes to `CylinderStructured` (see 561 and 577)
- Fix issues managing active scalars in widget plotting routines (see 533)
- Fix issues with getitem on `MultiBlock` datasets (see 563)
- Fix issue when volume rendering 3D NumPy arrays (see 575)
- Fix `combine` filter for `MultiBlock` datasets (see 535)
- Fixes to `pyvista.voxelize` (see 546)
- Update `copy_meta_from` to deep copy textures (see 564)

New Contributors

Be sure to welcome and thank these folks for their contributions!
- keurfonluu
- truenicoco
- imsodin

High Impact

- Resolved Windows crashes and disappearing plotters (see 502)
- Fully dropped support for Python 2.7 (see 493)
- Depth peeling to properly render translucent geometries (see 450)
- Full support for reading/writing files with `meshio` (see 472 and 495)
- Log scale color mapping (see 499)
- Keyword arguments are now strongly enforced across the API (see 432)
- the IPython tools module has been entirely removed (see 403)


New Features & Improvements

- More camera viewing options: e.g. `Plotter.view_zx`
- Gradient background colors when plotting (see 411)
- Gaussian smoothing filter for `pyvista.UniformGrid` meshes (see 420 and 485 )
- Save graphic method for SVG images (see 331)
- More culling options (see 292)
- Array name auto-completion in IPython when getting array (see 425)
- More keypress events in the plotters (see 434)
- New click position tracking in world coordinates (see 466)
- Enabled use of custom bounds with `texture_map_to_plane` (see 407)
- Document how to instantiate `pyvista.MultiBlock` objects (see 413)
- Control the border of the `backgroundPlotter` (see 416)
- Enable access to various contouring algorithms in the `contour` filter (see 421)
- Various widgets enhancements (see 415) and bug fixes
- Added support for passing a `PolyData` mesh as the box for the `clip_box` filter (see 433)
- PyQt improvements (see 424 and see 498)
- Q-key will not automatically bind to embedded Qt apps (see 508)
- Renderers will automatically update when embedded in Qt apps now (see 509)
- Colormaps can be defined as a list of string colors (see 445)
- Add helper method to see if `PolyData` mesh is made of all triangles (see 446)
- Clamping range added to `glyph` filter (see 451)
- Major naming consistency improvements for `*_scalars` and `*_array` (see 456)
- Use the camera transform matrix when getting/setting the camera position in scaled environments (see 476)
- More indexing options for `MultiBlock` objects (see 459)
- Enable `pyvista.read` to handle lists of file names and return `MultiBlock` object
- `FileNotFoundError` used over `IOError` (see 506)


Squashed Bugs

- Fixed `clim` issues with `Plotter.add_mesh_slice_orthogonal`
- Fixed issue when using `rng` keyword with widget plotting helpers
- Fixed Python 3.8 issues
- Fixed usage of `render_points_as_spheres` with `Plotter.add_point_labels`
- Fixed point labeling issues appearing in front of opaque meshes (see 366)
- Fixed issues when importing broken builds of `panel` (see 440)
- Fixed random behavior of `pyvista.CylinderStructured` (see 442)
- Fixed issues when copying `pyvista.MultiBlock` datasets
- Fixed an issue when parsing VTK errors as Python warnings
- Fixed major issues with volume rendering (see 464 and 497)
- Fixed memory leak from plotter not being cleared (484)
- Fixed issue when saving PLY meshes (see 489)

This update brings some major changes to the widgets (the previous API for widgets is broken. Please see new API)

New Features

- New Sphere and Spline widgets (see 383 and 401) with major overahul to allow support from many widgets in a single scene
- New OBJ scene exporter (see 392)
- New toolbar for the `BackgroundPlotter` for controlling the camera (see 351)
- `UniformGrid` objects can now be cast to `RectilinearGrid` objects (see 381)

Bug Fixes

- NaN camera position issue resolved (see 383)
- Scalar mapping issues for `uint8` arrays fixed (see 384)
- Fix `q`-key for closing the `BackgroundPlotter` (see 388)
- Properly grab screenshots when `BackgroundPlotter` closes (see 382)
- Fix issue when trying to plot multiple sets of point labels
- Add access to repeat option on the `Texture` class
- new viewport parameter to control text location in `BasePlotter.add_text` (see 390)
- Resolve some major Python 2.7 issues for backwards compatibility (see 393)
- Ignore strange errors when automatically grabbing depth image
- Fix issue with `lines_from_points` (see 394 and 399)
- Fix issue where `Plotter` class couldn’t accept the `title` argument.