Extruded Polygon Object

extruded_polygon(
  polygon = NULL,
  x = 0,
  y = 0,
  z = 0,
  plane = "xz",
  top = 1,
  bottom = 0,
  holes = NULL,
  angle = c(0, 0, 0),
  order_rotation = c(1, 2, 3),
  pivot_point = c(0, 0, 0),
  material = diffuse(),
  center = FALSE,
  flip_horizontal = FALSE,
  flip_vertical = FALSE,
  data_column_top = NULL,
  data_column_bottom = NULL,
  scale_data = 1,
  scale = c(1, 1, 1)
)

Arguments

polygon

`sf` object or xy coordinates of polygon represented in a way that can be processed by `xy.coords()`.

x

Default `0`. x-coordinate to offset the extruded model.

y

Default `0`. y-coordinate to offset the extruded model.

z

Default `0`. z-coordinate to offset the extruded model.

plane

Default `xz`. The plane the polygon is drawn in. All possibile orientations are `xz`, `zx`, `xy`, `yx`, `yz`, and `zy`.

top

Default `1`. Extruded top distance. If this equals `bottom`, the polygon will not be extruded and just the one side will be rendered.

bottom

Default `0`. Extruded bottom distance. If this equals `top`, the polygon will not be extruded and just the one side will be rendered.

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".

material

Default diffuse.The material, called from one of the material functions diffuse, metal, or dielectric.

center

Default `FALSE`. Whether to center the polygon at the origin.

flip_horizontal

Default `FALSE`. Flip polygon horizontally in the plane defined by `plane`.

flip_vertical

Default `FALSE`. Flip polygon vertically in the plane defined by `plane`.

data_column_top

Default `NULL`. A string indicating the column in the `sf` object to use to specify the top of the extruded polygon.

data_column_bottom

Default `NULL`. A string indicating the column in the `sf` object to use to specify the bottom of the extruded polygon.

scale_data

Default `1`. If specifying `data_column_top` or `data_column_bottom`, how much to scale that value when rendering.

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.

flipped

Default `FALSE`. Whether to flip the normals.

Value

Multiple row tibble describing the extruded polygon in the scene.

Examples

#Manually create a polygon object, here a star: angles = seq(0,360,by=36) xx = rev(c(rep(c(1,0.5),5),1) * sinpi(angles/180)) yy = rev(c(rep(c(1,0.5),5),1) * cospi(angles/180)) star_polygon = data.frame(x=xx,y=yy) # \dontrun{ generate_ground(depth=0, material = diffuse(color="grey50",checkercolor="grey20")) %>% add_object(extruded_polygon(star_polygon,top=0.5,bottom=0, material=diffuse(color="red",sigma=90))) %>% add_object(sphere(y=4,x=-3,z=-3,material=light(intensity=30))) %>% render_scene(parallel=TRUE,lookfrom = c(0,2,3),samples=400,lookat=c(0,0.5,0),fov=60)
# } #Now, let's add a hole to the center of the polygon. We'll make the polygon #hollow by shrinking it, combining it with the normal size polygon, #and specify with the `hole` argument that everything after `nrow(star_polygon)` #in the following should be used to draw a hole: hollow_star = rbind(star_polygon,0.8*star_polygon) # \dontrun{ generate_ground(depth=-0.01, material = diffuse(color="grey50",checkercolor="grey20")) %>% add_object(extruded_polygon(hollow_star,top=0.25,bottom=0, hole = nrow(star_polygon), material=diffuse(color="red",sigma=90))) %>% add_object(sphere(y=4,x=-3,z=-3,material=light(intensity=30))) %>% render_scene(parallel=TRUE,lookfrom = c(0,2,4),samples=400,lookat=c(0,0,0),fov=30)
# } # Render one in the y-x plane as well by changing the `plane` argument, # as well as offset it slightly. # \dontrun{ generate_ground(depth=-0.01, material = diffuse(color="grey50",checkercolor="grey20")) %>% add_object(extruded_polygon(hollow_star,top=0.25,bottom=0, hole = nrow(star_polygon), material=diffuse(color="red",sigma=90))) %>% add_object(extruded_polygon(hollow_star,top=0.25,bottom=0, y=1.2, z=-1.2, hole = nrow(star_polygon), plane = "yx", material=diffuse(color="green",sigma=90))) %>% add_object(sphere(y=4,x=-3,material=light(intensity=30))) %>% render_scene(parallel=TRUE,lookfrom = c(0,2,4),samples=400,lookat=c(0,0.9,0),fov=40)
# } # Now add the zy plane: # \dontrun{ generate_ground(depth=-0.01, material = diffuse(color="grey50",checkercolor="grey20")) %>% add_object(extruded_polygon(hollow_star,top=0.25,bottom=0, hole = nrow(star_polygon), material=diffuse(color="red",sigma=90))) %>% add_object(extruded_polygon(hollow_star,top=0.25,bottom=0, y=1.2, z=-1.2, hole = nrow(star_polygon), plane = "yx", material=diffuse(color="green",sigma=90))) %>% add_object(extruded_polygon(hollow_star,top=0.25,bottom=0, y=1.2, x=1.2, hole = nrow(star_polygon), plane = "zy", material=diffuse(color="blue",sigma=90))) %>% add_object(sphere(y=4,x=-3,material=light(intensity=30))) %>% render_scene(parallel=TRUE,lookfrom = c(-4,2,4),samples=400,lookat=c(0,0.9,0),fov=40)
# } #We can also directly pass in sf polygons: if("spData" %in% rownames(utils::installed.packages())) { us_states = spData::us_states texas = us_states[us_states$NAME == "Texas",] #Fix no sfc class in us_states geometry data class(texas$geometry) = c("list","sfc") } #This uses the raw coordinates, unless `center = TRUE`, which centers the bounding box #of the polygon at the origin. # \dontrun{ generate_ground(depth=-0.01, material = diffuse(color="grey50",checkercolor="grey20")) %>% add_object(extruded_polygon(texas, center = TRUE, material=diffuse(color="#ff2222",sigma=90))) %>% add_object(sphere(y=30,x=-30,radius=10, material=light(color="lightblue",intensity=40))) %>% render_scene(parallel=TRUE,lookfrom = c(0,10,-10),samples=400,fov=60)
# } #Here we use the raw coordinates, but offset the polygon manually. # \dontrun{ generate_ground(depth=-0.01, material = diffuse(color="grey50",checkercolor="grey20")) %>% add_object(extruded_polygon(us_states, x=-96,z=-40, top=2, material=diffuse(color="#ff2222",sigma=90))) %>% add_object(sphere(y=30,x=-100,radius=10, material=light(color="lightblue",intensity=200))) %>% add_object(sphere(y=30,x=100,radius=10, material=light(color="orange",intensity=200))) %>% render_scene(parallel=TRUE,lookfrom = c(0,120,-120),samples=400,fov=20)
# } #We can also set the map the height of each polygon to a column in the sf object, #scaling it down by the maximum population state. # \dontrun{ generate_ground(depth=0, material = diffuse(color="grey50",checkercolor="grey20",sigma=90)) %>% add_object(extruded_polygon(us_states, x=-96,z=-45, data_column_top = "total_pop_15", scale_data = 1/max(us_states$total_pop_15)*5, material=diffuse(color="#ff2222",sigma=90))) %>% add_object(sphere(y=30,x=-100,z=60,radius=10, material=light(color="lightblue",intensity=250))) %>% add_object(sphere(y=30,x=100,z=-60,radius=10, material=light(color="orange",intensity=250))) %>% render_scene(parallel=TRUE,lookfrom = c(-60,50,-40),lookat=c(0,-5,0),samples=400,fov=30)
# }