CSG Sphere

CSG Sphere

csg_sphere(x = 0, y = 0, z = 0, radius = 1)

Arguments

x	Default `0`. x-coordinate of the center of the sphere.
y	Default `0`. y-coordinate of the center of the sphere.
z	Default `0`. z-coordinate of the center of the sphere.
radius	Default `1`. Radius of the sphere.

Value

List describing the sphere in the scene.

Examples

# \donttest{
#Generate a simple sphere:
generate_ground() %>%
  add_object(csg_object(csg_sphere(),
                        material=glossy(color="purple"))) %>%
  render_scene(clamp_value=10,sample_method="stratified")

#Generate a bigger sphere in the cornell box.
generate_cornell() %>%
  add_object(csg_object(csg_sphere(x=555/2,y=555/2,z=555/2,radius=100),
                        material=glossy(checkercolor="purple", checkerperiod=100))) %>%
  render_scene(clamp_value=10,sample_method="stratified")
#> Setting default values for Cornell box: lookfrom `c(278,278,-800)` lookat `c(278,278,0)` fov `40` .

#Combine two spheres of different sizes
generate_cornell() %>%
  add_object(csg_object(
    csg_combine(
      csg_sphere(x=555/2,y=555/2-50,z=555/2,radius=100),
      csg_sphere(x=555/2,y=555/2+50,z=555/2,radius=80)),
    material=glossy(color="purple"))) %>%
  render_scene(clamp_value=10,sample_method="stratified")
#> Setting default values for Cornell box: lookfrom `c(278,278,-800)` lookat `c(278,278,0)` fov `40` .

#Subtract two spheres to create an indented region
generate_cornell() %>%
  add_object(csg_object(
    csg_combine(
      csg_sphere(x=555/2,y=555/2-50,z=555/2,radius=100),
      csg_sphere(x=555/2+30,y=555/2+20,z=555/2-90,radius=40),
      operation="subtract"),
    material=glossy(color="grey20"))) %>%
  render_scene(clamp_value=10,sample_method="stratified")
#> Setting default values for Cornell box: lookfrom `c(278,278,-800)` lookat `c(278,278,0)` fov `40` .

#Use csg_combine(operation="blend") to melt the two together
generate_cornell() %>%
  add_object(csg_object(
    csg_combine(
      csg_sphere(x=555/2,y=555/2-50,z=555/2,radius=100),
      csg_sphere(x=555/2,y=555/2+50,z=555/2,radius=80),
      operation="blend", radius=20),
    material=glossy(color="purple"))) %>%
  render_scene(clamp_value=10,sample_method="stratified")
#> Setting default values for Cornell box: lookfrom `c(278,278,-800)` lookat `c(278,278,0)` fov `40` .
# }