File:Parametric surface illustration (trefoil knot).png
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Summary
| Description |
English: Self-made with PlotOptiX package for ray tracing in Python. |
| Date | |
| Source | Own work |
| Author | Rob su |
Licensing
I, the copyright holder of this work, hereby publish it under the following license:
This file is licensed under the Creative Commons Attribution-Share Alike 4.0 International license.
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- to share – to copy, distribute and transmit the work
- to remix – to adapt the work
- Under the following conditions:
- attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
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Source code (python)
import numpy as np
# docs, examples: https://plotoptix.rnd.team
from plotoptix import TkOptiX
from plotoptix.utils import make_color
from plotoptix.materials import m_plastic
def trefoil(u, v, r):
x = r * np.sin(3 * u) / (2 + np.cos(v))
y = r * (np.sin(u) + 2 * np.sin(2 * u)) / (2 + np.cos(v + np.pi * 2 / 3))
z = r / 2 * (np.cos(u) - 2 * np.cos(2 * u)) * (2 + np.cos(v)) * (2 + np.cos(v + np.pi * 2 / 3)) / 4
return np.array([x, y, z], dtype=np.float32)
r = (-np.pi, 3*np.pi)
n = 500
i = np.linspace(r[0], r[1], n)
U, V = np.meshgrid(i, i)
S = np.swapaxes(trefoil(U, V, 5), 0, 2)
rt = TkOptiX(width=1500, height=1800)
rt.set_param(min_accumulation_step=2,
max_accumulation_frames=500,
light_shading="Hard")
rt.set_uint("path_seg_range", 6, 15)
rt.setup_material("plastic", m_plastic)
exposure = 0.8; gamma = 2.2
rt.set_float("tonemap_exposure", exposure)
rt.set_float("tonemap_gamma", gamma)
rt.add_postproc("Gamma")
rt.set_background(0)
rt.set_ambient(0.15)
rt.set_surface("surface", S, c=0.94, make_normals=True, mat="plastic")
rt.set_data("plane", geom="Parallelograms",
pos=[[-100, -14, -100]], u=[200, 0, 0], v=[0, 0, 200],
c=make_color([0.1, 0.2, 0.3], exposure=exposure, gamma=gamma))
rt.setup_camera("cam1", cam_type="DoF",
eye=[-50, -7, -15], target=[0, 0, -1], up=[0, 1, 0],
aperture_radius=0.4, aperture_fract=0.2,
focal_scale=0.92, fov=35)
rt.setup_light("light1", pos=[-15, 20, 15], color=8, radius=6)
rt.start()
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 08:59, 10 June 2019 |  | 1,504 × 1,804 (1.59 MB) | Rob su | User created page with UploadWizard |
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