Visualize SDF Actor

Here is a simple tutorial that shows how to visualize SDF primitives using FURY.

SDFs or Signed-distance functions when passed the coordinates of a point in space, return the shortest distance between that point and some surface. This property of SDFs can be used to model 3D geometry at a faster rate compared to traditional polygons based modeling.

In this example we use the raymarching algorithm to render the SDF primitives shapes using shaders

import numpy as np
from fury import window, actor

Lets define variables for the SDF Actor

dirs = np.random.rand(3, 3)
colors = np.random.rand(3, 3) * 255
centers = np.array([[1, 0, 0], [0, 0, 0], [-1, 0, 0]])
scales = np.random.rand(3, 1)

Create SDF Actor

sdfactor = actor.sdf(centers=centers, directions=dirs, colors=colors,
                     primitives=['sphere', 'torus', 'ellipsoid'],
                     scales=scales)

Create a scene

scene = window.Scene()
scene.background((1.0, 0.8, 0.8))
scene.add(sdfactor)

Show Manager

Since all the elements have been initialised ,we add them to the show manager.

current_size = (1024, 720)
showm = window.ShowManager(scene, size=current_size,
                           title="Visualize SDF Actor")

interactive = False

if interactive:
    showm.start()

window.record(scene, out_path='viz_sdfactor.png', size=current_size)