# ellipsoid: Ellipsoid Object In rayrender: Build and Raytrace 3D Scenes

## Description

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

## Usage

 ``` 1 2 3 4 5 6 7 8 9 10 11 12 13 14``` ```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

 ``` 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26``` ```#Generate an ellipsoid in a Cornell box 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 = 500, parallel = TRUE, clamp_value = 5) #Change the axes to make it taller rather than wide: 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 = 500, parallel = TRUE, clamp_value = 5) #Rotate it and make it dielectric: 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 = 500, parallel = TRUE, clamp_value = 5) ```

rayrender documentation built on April 7, 2021, 5:06 p.m.