csg_onion.Rd

% Generated by roxygen2: do not edit by hand
% Please edit documentation in R/csg_construct.R
\name{csg_onion}
\alias{csg_onion}
\title{CSG Onion}
\usage{
csg_onion(object, thickness = 0.1)
}
\arguments{
\item{object}{CSG object.}

\item{thickness}{Default `0.1`. Onioning distance.}
}
\value{
List describing the triangle in the scene.
}
\description{
Note: This operation has no overt effect on the external appearance of an object--it carves
regions on the interior. Thus, you will only see an effect with a transparent material or when
you carve into the object.
}
\examples{
if(run_documentation()) {
#Cut and onion a sphere:
generate_ground(material=diffuse(checkercolor="grey20")) \%>\%
  add_object(csg_object(csg_combine(
    csg_onion(csg_sphere(z=2,x=2,radius=1), thickness = 0.2),
    csg_box(y=1,width=c(10,2,10)), operation = "subtract"),
    material=glossy(color="red"))) \%>\%
    add_object(csg_object(csg_combine(
      csg_onion(csg_sphere(radius=1), thickness = 0.4),
      csg_box(y=1,width=c(10,2,10)), operation = "subtract"),
      material=glossy(color="purple"))) \%>\%
    add_object(csg_object(csg_combine(
      csg_onion(csg_sphere(z=-2.5,x=-2.5,radius=1), thickness = 0.6),
      csg_box(y=1,width=c(10,2,10)), operation = "subtract"),
      material=glossy(color="green"))) \%>\%
 add_object(sphere(y=5,x=5,radius=2,material=light())) \%>\%
 render_scene(clamp_value=10, samples=16,lookat=c(0,-0.5,0),
              lookfrom=c(3,5,10),fov=35)
}
if(run_documentation()) {
#Multiple onion layers:
generate_ground(material=diffuse(checkercolor="grey20")) \%>\%
  add_object(csg_object(csg_combine(
    csg_onion(csg_onion(csg_onion(csg_sphere(radius=1), 0.4), 0.2),0.1),
    csg_box(y=1,width=c(10,2,10)), operation = "subtract"),
    material=glossy(color="purple"))) \%>\%
  add_object(sphere(y=5,x=5,radius=2,material=light())) \%>\%
  render_scene(clamp_value=10, samples=16,lookat=c(0,-0.5,0),
               lookfrom=c(3,5,10),fov=20)
  }
if(run_documentation()) {
#Onion with dielectric sphere to make a bubble:
generate_cornell() \%>\%
  add_object(csg_object(
    csg_onion(csg_sphere(x=555/2,y=555/2,z=555/2, radius=150), 5),
    material=dielectric(attenuation=c(1,1,0.3)/100))) \%>\%
  render_scene(clamp_value=10, samples=16)
  }
if(run_documentation()) {
#Multiple onion operations to make a bubble within a bubble:
generate_cornell() \%>\%
  add_object(csg_object(
    csg_onion(csg_onion(csg_sphere(x=555/2,y=555/2,z=555/2, radius=150), 10),5),
    material=dielectric(attenuation=c(1,1,0.3)/100))) \%>\%
  render_scene(clamp_value=10, samples=16)
}
}