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),
  velocity = c(0, 0, 0),
  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".

velocity

Default `c(0, 0, 0)`. Velocity of the segment.

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 # \donttest{ 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 = 400, parallel = TRUE, clamp_value = 5)
# } #Change the axes to make it taller rather than wide: # \donttest{ 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 = 400, parallel = TRUE, clamp_value = 5)
# } #Rotate it and make it dielectric: # \donttest{ 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 = 400, parallel = TRUE, clamp_value = 5)
# }