construct_mesh: Manually construct a mesh

In rayvertex: 3D Software Rasterizer

Manually construct a mesh

Description

Manually construct a mesh

Usage

construct_mesh(
  vertices,
  indices,
  normals = NULL,
  norm_indices = NULL,
  texcoords = NULL,
  tex_indices = NULL,
  material = material_list()
)

Arguments

vertices	Nx3 matrix of vertex coordinates..
indices	Nx3 integer matrix, where each row defines a triangle using the vertices defined in 'vertices'.
normals	Default 'NULL'. Nx3 matrix of normals.
norm_indices	Nx3 integer matrix, where each row defines the normal for a vertex using the normals defined in 'normals' for the corresponding triangle in 'indices'. Required to be the same number of rows as 'indices'.
texcoords	Default 'NULL'. Nx2 matrix of texture coordinates.
tex_indices	Nx3 integer matrix, where each row defines the texture coordinates for a triangle using the tex coords defined in 'texcoors' for the corresponding triangle in 'indices'. Required to be the same number of rows as 'indices'.
material	Default 'material_list()' (default values). Specify the material of the object.

Value

List containing mesh info.

Examples

if(rayvertex:::run_documentation()) {
#Let's construct a mesh from the volcano dataset
#Build the vertex matrix
vertex_list = list()
counter = 1
for(i in 1:nrow(volcano)) {
  for(j in 1:ncol(volcano)) {
    vertex_list[[counter]] = matrix(c(j,volcano[i,j],i), ncol=3)
    counter = counter + 1
  }
}
vertices = do.call(rbind,vertex_list)

#Build the index matrix
index_list = list()
counter = 0
for(i in 1:(nrow(volcano)-1)) {
  for(j in 1:(ncol(volcano)-1)) {
    index_list[[counter+1]] = matrix(c(counter,counter+ncol(volcano),counter+1,
                                       counter+ncol(volcano),counter+ncol(volcano)+1,counter + 1), 
                                     nrow=2, ncol=3, byrow=TRUE)
    counter = counter + 1
  }
  counter = counter + 1
}
indices = do.call(rbind,index_list)

#Construct the mesh
volc_mesh = construct_mesh(vertices = vertices, indices = indices,
                           material = material_list(type="phong", diffuse="darkred", 
                                                    ambient = "darkred", ambient_intensity=0.2))

#Rasterize the scene
rasterize_scene(volc_mesh, lookfrom=c(-50,230,100),fov=60,width=1200,height=1200,
                light_info = directional_light(c(0,1,1)) |>
                  add_light(directional_light(c(1,1,-1))))
}

rayvertex documentation built on July 9, 2023, 5:52 p.m.