factory.vector_field.rst

vector_field

k3d.factory.vector_field

- vectors

Examples

Basic

import k3d
import numpy as np

def f(x, y):
    return np.sin(y), np.sin(x)

H = W = 10

vectors = np.array([[f(x, y) for x in range(W)] for y in range(H)]).astype(np.float32)
plt_vector_field = k3d.vector_field(vectors,
                                    color=0xed6a5a,
                                    head_size=1.5,
                                    scale=2,
                                    bounds=[-1, 1, -1, 1, -1, 1])

plot = k3d.plot(grid_auto_fit=False)
plot += plt_vector_field
plot.display()

Colormap

import k3d
import numpy as np
from k3d.colormaps import matplotlib_color_maps
from k3d.helpers import map_colors
from numpy.linalg import norm

p = np.linspace(-1, 1, 10)

def f(x, y, z):
    return y * z, x * z, x * y

vectors = np.array([[[f(x, y, z) for x in p] for y in p] for z in p]).astype(np.float32)
norms = np.apply_along_axis(norm, 1, vectors.reshape(-1, 3))

plt_vector_field = k3d.vector_field(vectors,
                                    head_size=1.5,
                                    scale=2,
                                    bounds=[-1, 1, -1, 1, -1, 1])

colors = map_colors(norms, matplotlib_color_maps.Turbo, [0, 1]).astype(np.uint32)
plt_vector_field.colors = np.repeat(colors, 2)

plot = k3d.plot()
plot += plt_vector_field
plot.display()