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"""Cubemap utilities."""
from __future__ import annotations
from pathlib import Path
import pyvista
from pyvista.plotting import _vtk
def cubemap(path='', prefix='', ext='.jpg'):
"""Construct a cubemap from 6 images from a directory.
Each of the 6 images must be in the following format:
- <prefix>negx<ext>
- <prefix>negy<ext>
- <prefix>negz<ext>
- <prefix>posx<ext>
- <prefix>posy<ext>
- <prefix>posz<ext>
Prefix may be empty, and extension will default to ``'.jpg'``
For example, if you have 6 images with the skybox2 prefix:
- ``'skybox2-negx.jpg'``
- ``'skybox2-negy.jpg'``
- ``'skybox2-negz.jpg'``
- ``'skybox2-posx.jpg'``
- ``'skybox2-posy.jpg'``
- ``'skybox2-posz.jpg'``
Parameters
----------
path : str, default: ""
Directory containing the cubemap images.
prefix : str, default: ""
Prefix to the filename.
ext : str, default: ".jpg"
The filename extension. For example ``'.jpg'``.
Returns
-------
pyvista.Texture
Texture with cubemap.
Notes
-----
Cubemap will appear flipped relative to the XY plane between VTK v9.1 and
VTK v9.2.
Examples
--------
Load a skybox given a directory, prefix, and file extension.
>>> import pyvista as pv
>>> skybox = pv.cubemap(
... 'my_directory', 'skybox', '.jpeg'
... ) # doctest:+SKIP
"""
sets = ['posx', 'negx', 'posy', 'negy', 'posz', 'negz']
image_paths = [str(Path(path) / f'{prefix}{suffix}{ext}') for suffix in sets]
return _cubemap_from_paths(image_paths)
def cubemap_from_filenames(image_paths):
"""Construct a cubemap from 6 images.
Images must be in the following order:
- Positive X
- Negative X
- Positive Y
- Negative Y
- Positive Z
- Negative Z
Parameters
----------
image_paths : sequence[str]
Paths of the individual cubemap images.
Returns
-------
pyvista.Texture
Texture with cubemap.
Examples
--------
Load a skybox given a list of image paths.
>>> image_paths = [
... '/home/user/_px.jpg',
... '/home/user/_nx.jpg',
... '/home/user/_py.jpg',
... '/home/user/_ny.jpg',
... '/home/user/_pz.jpg',
... '/home/user/_nz.jpg',
... ]
>>> skybox = pv.cubemap(image_paths=image_paths) # doctest:+SKIP
"""
if len(image_paths) != 6:
raise ValueError("image_paths must contain 6 paths")
return _cubemap_from_paths(image_paths)
def _cubemap_from_paths(image_paths):
"""Construct a cubemap from image paths."""
for image_path in image_paths:
if not Path(image_path).is_file():
file_str = '\n'.join(image_paths)
raise FileNotFoundError(
f'Unable to locate {image_path}\n'
'Expected to find the following files:\n'
f'{file_str}',
)
texture = pyvista.Texture()
texture.SetMipmap(True)
texture.SetInterpolate(True)
texture.cube_map = True # Must be set prior to setting images
# add each image to the cubemap
for i, fn in enumerate(image_paths):
image = pyvista.read(fn)
flip = _vtk.vtkImageFlip()
flip.SetInputDataObject(image)
flip.SetFilteredAxis(1) # flip y-axis
flip.Update()
texture.SetInputDataObject(i, flip.GetOutput())
return texture
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