Ellipsoid Object — ellipsoid • rayrender

Note: light importance sampling for this shape is currently approximated by a sphere. This will fail for ellipsoids with large differences between axes.

ellipsoid(
  x = 0,
  y = 0,
  z = 0,
  a = 1,
  b = 1,
  c = 1,
  material = diffuse(),
  angle = c(0, 0, 0),
  order_rotation = c(1, 2, 3),
  flipped = FALSE,
  scale = c(1, 1, 1)
)

Arguments

x: Default `0`. x-coordinate of the center of the ellipsoid.
y: Default `0`. y-coordinate of the center of the ellipsoid.
z: Default `0`. z-coordinate of the center of the ellipsoid.
a: Default `1`. Principal x-axis of the ellipsoid.
b: Default `1`. Principal y-axis of the ellipsoid.
c: Default `1`. Principal z-axis of the ellipsoid.
material: Default diffuse.The material, called from one of the material functions diffuse, metal, or dielectric.
angle: Default `c(0, 0, 0)`. Angle of rotation around the x, y, and z axes, applied in the order specified in `order_rotation`.
order_rotation: Default `c(1, 2, 3)`. The order to apply the rotations, referring to "x", "y", and "z".
flipped: Default `FALSE`. Whether to flip the normals.
scale: Default `c(1, 1, 1)`. Scale transformation in the x, y, and z directions. If this is a single value, number, the object will be scaled uniformly. Note: emissive objects may not currently function correctly when scaled.

Value

Single row of a tibble describing the ellipsoid in the scene.

Examples

#Generate an ellipsoid in a Cornell box
if(run_documentation()) {
generate_cornell() %>%
  add_object(ellipsoid(x = 555/2, y = 555/2, z = 555/2, 
                       a = 100, b = 50, c = 50)) %>%
  render_scene(lookfrom = c(278, 278, -800) ,lookat = c(278, 278, 0), fov = 40, 
               ambient_light = FALSE, samples = 128, parallel = TRUE, clamp_value = 5)
}


#Change the axes to make it taller rather than wide:
if(run_documentation()) {
generate_cornell() %>%
  add_object(ellipsoid(x = 555/2, y = 555/2, z = 555/2, 
                       a = 100, b = 200, c = 100, material = metal())) %>%
  render_scene(lookfrom = c(278, 278, -800) ,lookat = c(278, 278, 0), fov = 40, 
               ambient_light = FALSE, samples = 128, parallel = TRUE, clamp_value = 5)
}


#Rotate it and make it dielectric:
if(run_documentation()) {
generate_cornell() %>%
  add_object(ellipsoid(x = 555/2, y = 555/2, z = 555/2, 
                       a = 100, b = 200, c = 100, angle = c(0, 0, 45),
                       material = dielectric())) %>%
  render_scene(lookfrom = c(278, 278, -800) ,lookat = c(278, 278, 0), fov = 40, 
               ambient_light = FALSE, samples = 128, parallel = TRUE, clamp_value = 5)
}