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# -*- coding: utf-8 -*-
import numpy as np
import pytest
from vispy import scene
from vispy.geometry import create_sphere
from vispy.testing import (TestingCanvas, requires_application,
run_tests_if_main, requires_pyopengl)
@requires_pyopengl()
@requires_application()
def test_mesh_normals():
size = (45, 40)
with TestingCanvas(size=size, bgcolor="k") as c:
v = c.central_widget.add_view(border_width=0)
v.camera = 'arcball'
# Create visual.
mdata = create_sphere(radius=1.0)
mesh = scene.visuals.Mesh(meshdata=mdata,
shading=None,
color=(0.1, 0.1, 0.1, 1.0))
v.add(mesh)
rendered_without_normals = c.render()
# The color should be of low intensity.
assert np.all((rendered_without_normals[..., 0:3]) < 32)
face_normals = scene.visuals.MeshNormals(mdata, primitive="face",
color=(1, 0, 0))
face_normals.parent = mesh
rendered_with_face_normals = c.render()
face_normals.parent = None
# There should be some pixels with brighter red.
assert np.sum(rendered_with_face_normals[..., 0] > 128) > 64
pytest.raises(AssertionError, np.testing.assert_allclose,
rendered_without_normals, rendered_with_face_normals)
vertex_normals = scene.visuals.MeshNormals(mdata, primitive="vertex",
color=(0, 1, 0))
vertex_normals.parent = mesh
rendered_with_vertex_normals = c.render()
vertex_normals.parent = None
# There should be some pixels with brighter green.
assert np.sum(rendered_with_vertex_normals[..., 1] > 128) > 64
pytest.raises(AssertionError, np.testing.assert_allclose,
rendered_without_normals, rendered_with_vertex_normals)
pytest.raises(AssertionError, np.testing.assert_allclose,
rendered_with_face_normals, rendered_with_vertex_normals)
@requires_pyopengl()
@requires_application()
def test_mesh_normals_length_scalar():
size = (45, 40)
with TestingCanvas(size=size, bgcolor="k") as c:
v = c.central_widget.add_view(border_width=0)
v.camera = 'arcball'
# Create visual.
mdata = create_sphere(radius=1.0)
mesh = scene.visuals.Mesh(meshdata=mdata,
shading=None,
color=(0.1, 0.1, 0.1, 1.0))
v.add(mesh)
length = 0.5
normals_0_5 = scene.visuals.MeshNormals(mdata, color=(1, 0, 0),
length=length)
normals_0_5.parent = mesh
rendered_length_0_5 = c.render()
normals_0_5.parent = None
length = 1.0
normals_1_0 = scene.visuals.MeshNormals(mdata, color=(1, 0, 0),
length=length)
normals_1_0.parent = mesh
rendered_length_1_0 = c.render()
normals_1_0.parent = None
# There should be more red pixels with the longer normals.
n_pixels_0_5 = np.sum(rendered_length_0_5[..., 0] > 128)
n_pixels_1_0 = np.sum(rendered_length_1_0[..., 0] > 128)
assert n_pixels_1_0 > n_pixels_0_5
@requires_pyopengl()
@requires_application()
@pytest.mark.parametrize('primitive', ['face', 'vertex'])
def test_mesh_normals_length_array(primitive):
size = (45, 40)
with TestingCanvas(size=size, bgcolor="k") as c:
v = c.central_widget.add_view(border_width=0)
v.camera = 'arcball'
v.camera.fov = 90
# Create visual.
meshdata = create_sphere(radius=1.0)
mesh = scene.visuals.Mesh(meshdata=meshdata,
shading=None,
color=(0.1, 0.1, 0.1, 1.0))
v.add(mesh)
if primitive == 'face':
n_normals = len(meshdata.get_faces())
elif primitive == 'vertex':
n_normals = len(meshdata.get_vertices())
lengths_0_5 = np.full(n_normals, 0.5, dtype=float)
normals_0_5 = scene.visuals.MeshNormals(meshdata, primitive=primitive,
color=(1, 0, 0),
length=lengths_0_5)
normals_0_5.parent = mesh
rendered_lengths_0_5 = c.render()
normals_0_5.parent = None
lengths_1_0 = np.full(n_normals, 1.0, dtype=float)
normals_1_0 = scene.visuals.MeshNormals(meshdata, primitive=primitive,
color=(1, 0, 0),
length=lengths_1_0)
normals_1_0.parent = mesh
rendered_lengths_1_0 = c.render()
normals_1_0.parent = None
# There should be more red pixels with the longer normals.
n_pixels_0_5 = np.sum(rendered_lengths_0_5[..., 0] > 128)
n_pixels_1_0 = np.sum(rendered_lengths_1_0[..., 0] > 128)
assert n_pixels_1_0 > n_pixels_0_5
lengths_ramp = np.linspace(0.5, 1.0, n_normals, dtype=float)
normals_ramp = scene.visuals.MeshNormals(meshdata, primitive=primitive,
color=(1, 0, 0),
length=lengths_ramp)
normals_ramp.parent = mesh
rendered_lengths_ramp = c.render()
normals_ramp.parent = None
# With the normals lengths from a ramp in [0.5, 1.0], there should be
# more red pixels than with all normals of length 0.5 and less than
# with all normals of length 1.0.
n_pixels_ramp = np.sum(rendered_lengths_ramp[..., 0] > 128)
assert n_pixels_0_5 < n_pixels_ramp < n_pixels_1_0
@requires_pyopengl()
@requires_application()
def test_mesh_normals_length_scale():
size = (45, 40)
with TestingCanvas(size=size, bgcolor="k") as c:
v = c.central_widget.add_view(border_width=0)
v.camera = 'arcball'
# Create visual.
meshdata = create_sphere(radius=1.0)
mesh = scene.visuals.Mesh(meshdata=meshdata,
shading=None,
color=(0.1, 0.1, 0.1, 1.0))
v.add(mesh)
length = 1.0
length_scale_up = 2.0
length_scale_down = 0.5
normals = scene.visuals.MeshNormals(meshdata, color=(1, 0, 0),
length=length)
normals.parent = mesh
rendered_length_default = c.render()
normals.parent = None
normals_scaled_up = scene.visuals.MeshNormals(
meshdata, color=(1, 0, 0), length=length,
length_scale=length_scale_up)
normals_scaled_up.parent = mesh
rendered_length_scaled_up = c.render()
normals_scaled_up.parent = None
normals_scaled_down = scene.visuals.MeshNormals(
meshdata, color=(1, 0, 0), length=length,
length_scale=length_scale_down)
normals_scaled_down.parent = mesh
rendered_length_scaled_down = c.render()
normals_scaled_down.parent = None
# There should be more red pixels with the scaled-up normals and less
# with the ones scaled down.
n_pixels_default = np.sum(rendered_length_default[..., 0] > 128)
n_pixels_scaled_up = np.sum(rendered_length_scaled_up[..., 0] > 128)
n_pixels_scaled_down = np.sum(rendered_length_scaled_down[..., 0] > 128)
assert n_pixels_scaled_down < n_pixels_default < n_pixels_scaled_up
@requires_pyopengl()
@requires_application()
@pytest.mark.parametrize('length_method', ['median_edge', 'max_extent'])
def test_mesh_normals_length_method(length_method):
size = (45, 40)
with TestingCanvas(size=size, bgcolor="k") as c:
v = c.central_widget.add_view(border_width=0)
v.camera = 'arcball'
# Create visual.
meshdata = create_sphere(radius=1.0)
mesh = scene.visuals.Mesh(meshdata=meshdata,
shading=None,
color=(0.1, 0.1, 0.1, 1.0))
v.add(mesh)
# The code below should not raise.
# XXX(asnt): Not sure how to better test `length_method`.
normals = scene.visuals.MeshNormals(meshdata, color=(1, 0, 0),
length_method=length_method)
normals.parent = mesh
_ = c.render()
def test_mesh_normals_empty():
mesh = scene.visuals.Mesh()
scene.visuals.MeshNormals(mesh.mesh_data)
run_tests_if_main()
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