test_visual_texture.py

import math
import numpy as np
import pytest
import vtk
from vtk.util import numpy_support

import k3d
from .plot_compare import prepare, compare


def test_texture():
    prepare()

    # Y-Z flip
    model_matrix = [
        1.0, 0.0, 0.0, 0.0,
        0.0, -1.0, 0.0, 0.0,
        0.0, 0.0, 1.0, 0.0,
        0.0, 0.0, 0.0, 1.0
    ]

    with open('./test/assets/texture.png', 'br') as file:
        texture = k3d.texture(file.read(), 'png',
                              rotation=[math.radians(90), 1, 0, 0],
                              model_matrix=model_matrix,
                              name='Photo')

    pytest.plot += texture

    compare('texture')

    with open('./test/assets/mandelbrot.jpg', 'br') as file:
        texture.binary = file.read()
    texture.name = 'Fractal'

    compare('texture_dynamic_change')


def test_texture_attribute():
    prepare()

    reader = vtk.vtkXMLImageDataReader()
    reader.SetFileName('./test/assets/volume.vti')
    reader.Update()
    vti = reader.GetOutput()

    x, y, z = vti.GetDimensions()
    volume_data = numpy_support.vtk_to_numpy(
        vti.GetPointData().GetArray(0)
    ).reshape(-1, y, x).astype(np.float32)

    texture = k3d.texture(attribute=volume_data[64],
                          transform=k3d.transform(rotation=[np.pi / 2, 1, 0, 0]),
                          color_map=k3d.basic_color_maps.Jet,
                          opacity_function=[-1, 1, 1, 1],
                          name='Slice')

    pytest.plot += texture

    compare('texture_attribute')

    texture.interpolation = False

    compare('texture_attribute_dynamic_interpolation')