CSG Elongate

This operation elongates an existing CSG object in a direction.

csg_elongate(object, x = 0, y = 0, z = 0, elongate = c(0, 0, 0), robust = TRUE)

Arguments

object

CSG object.

x

Default `0`. Center of x-elongation.

y

Default `0`. Center of y-elongation.

z

Default `0`. Center of z-elongation.

elongate

Default `c(0,0,0)` (no elongation). Elongation amount.

robust

Default `TRUE`. `FALSE` switches to a faster (but less robust in 2D) method.

Value

List describing the triangle in the scene.

Examples

if(run_documentation()) {
#Elongate a sphere to create a capsule in 1D or a rounded rectangle in 2D:
generate_ground(material=diffuse(checkercolor="grey20",color="dodgerblue4")) %>% 
 add_object(csg_object(csg_sphere(z=-3,x=-3),
                        material=glossy(color="purple"))) %>% 
 add_object(csg_object(csg_elongate(csg_sphere(z=-3,x=3),x=3,z=-3, elongate = c(0.8,0,0)),
                        material=glossy(color="red"))) %>% 
 add_object(csg_object(csg_elongate(csg_sphere(z=2),z=2, elongate = c(0.8,0,0.8)),
                        material=glossy(color="white"))) %>% 
 add_object(sphere(y=10,radius=3,material=light(intensity=8))) %>% 
 render_scene(clamp_value=10,fov=40,lookfrom=c(0,10,10))
  }

if(run_documentation()) {
#Elongate a torus:
generate_ground(material=diffuse(checkercolor="grey20",color="dodgerblue4")) %>% 
 add_object(csg_object(csg_torus(z=-3,x=-3),
                        material=glossy(color="purple"))) %>% 
 add_object(csg_object(csg_elongate(csg_torus(z=-3,x=3),x=3,z=-3, elongate = c(0.8,0,0)),
                        material=glossy(color="red"))) %>% 
 add_object(csg_object(csg_elongate(csg_torus(z=2),z=2, elongate = c(0.8,0,0.8)),
                        material=glossy(color="white"))) %>% 
 add_object(sphere(y=10,radius=3,material=light(intensity=8))) %>% 
 render_scene(clamp_value=10,fov=40,lookfrom=c(0,10,10))
 }

if(run_documentation()) {
#Elongate a cylinder:
generate_ground(material=diffuse(checkercolor="grey20",color="dodgerblue4")) %>% 
 add_object(csg_object(csg_cylinder(start=c(-3,0,-3), end = c(-3,1,-3)),
                        material=glossy(color="purple"))) %>% 
 add_object(csg_object(csg_elongate(csg_cylinder(start=c(3,0,-3), end = c(3,1,-3)), x=3, z=-3, 
                       elongate = c(0.8,0,0)),
                       material=glossy(color="red"))) %>% 
 add_object(csg_object(csg_elongate(csg_cylinder(start=c(0,0,3), end = c(0,1,3)), z=3, 
                       elongate = c(0.8,0,0.8)),
                       material=glossy(color="white"))) %>% 
 add_object(sphere(y=10,radius=3,material=light(intensity=8))) %>% 
 render_scene(clamp_value=10,fov=40,lookfrom=c(0,10,10))
 }

if(run_documentation()) {
#Elongate a pyramid:
generate_ground(material=diffuse(checkercolor="grey20",color="dodgerblue4")) %>% 
 add_object(csg_object(csg_pyramid(z=-3,x=-3),
                        material=glossy(color="purple"))) %>% 
 add_object(csg_object(csg_elongate(csg_pyramid(z=-3,x=3),x=3,z=-3, elongate = c(0.8,0,0)),
                        material=glossy(color="red"))) %>% 
 add_object(csg_object(csg_elongate(csg_pyramid(z=2),z=2, elongate = c(0.8,0,0.8)),
                        material=glossy(color="white"))) %>% 
 add_object(sphere(y=10,radius=3,material=light(intensity=8))) %>% 
 render_scene(clamp_value=10,fov=40,lookfrom=c(0,10,10))
}

if(run_documentation()) {
#Change the elongation point to start the elongation on the side of the pyramid:
generate_ground(material=diffuse(checkercolor="grey20",color="dodgerblue4")) %>% 
 add_object(csg_object(csg_pyramid(z=-3,x=-3),
                        material=glossy(color="purple"))) %>% 
 add_object(csg_object(csg_elongate(csg_pyramid(z=-3,x=3),x=2.75,z=-2.75, elongate = c(0.8,0,0)),
                        material=glossy(color="red"))) %>% 
 add_object(csg_object(csg_elongate(csg_pyramid(z=2),z=2.25, elongate = c(0.8,0,0.8)),
                        material=glossy(color="white"))) %>% 
 add_object(sphere(y=10,radius=3,material=light(intensity=8))) %>% 
 render_scene(clamp_value=10,fov=40,
              lookfrom=c(5,5,10),lookat=c(0,0,-1.5))
}