read_test()
{
int i,j,k;
PlyFile *ply;
int nelems;
char **elist;
int file_type;
float version;
int nprops;
int num_elems;
PlyProperty **plist;
Vertex **vlist;
Face **flist;
char *elem_name;
int num_comments;
char **comments;
int num_obj_info;
char **obj_info;
/* open a PLY file for reading */
ply = ply_open_for_reading("test", &nelems, &elist, &file_type, &version);
/* print what we found out about the file */
printf ("version %f\n", version);
printf ("type %d\n", file_type);
/* go through each kind of element that we learned is in the file */
/* and read them */
for (i = 0; i < nelems; i++) {
/* get the description of the first element */
elem_name = elist[i];
plist = ply_get_element_description (ply, elem_name, &num_elems, &nprops);
/* print the name of the element, for debugging */
printf ("element %s %d\n", elem_name, num_elems);
/* if we're on vertex elements, read them in */
if (equal_strings ("vertex", elem_name)) {
/* create a vertex list to hold all the vertices */
vlist = (Vertex **) malloc (sizeof (Vertex *) * num_elems);
/* set up for getting vertex elements */
ply_get_property (ply, elem_name, &vert_props[0]);
ply_get_property (ply, elem_name, &vert_props[1]);
ply_get_property (ply, elem_name, &vert_props[2]);
/* grab all the vertex elements */
for (j = 0; j < num_elems; j++) {
/* grab and element from the file */
vlist[j] = (Vertex *) malloc (sizeof (Vertex));
ply_get_element (ply, (void *) vlist[j]);
/* print out vertex x,y,z for debugging */
printf ("vertex: %g %g %g\n", vlist[j]->x, vlist[j]->y, vlist[j]->z);
}
}
/* if we're on face elements, read them in */
if (equal_strings ("face", elem_name)) {
/* create a list to hold all the face elements */
flist = (Face **) malloc (sizeof (Face *) * num_elems);
/* set up for getting face elements */
ply_get_property (ply, elem_name, &face_props[0]);
ply_get_property (ply, elem_name, &face_props[1]);
/* grab all the face elements */
for (j = 0; j < num_elems; j++) {
/* grab and element from the file */
flist[j] = (Face *) malloc (sizeof (Face));
ply_get_element (ply, (void *) flist[j]);
/* print out face info, for debugging */
printf ("face: %d, list = ", flist[j]->intensity);
for (k = 0; k < flist[j]->nverts; k++)
printf ("%d ", flist[j]->verts[k]);
printf ("\n");
}
}
/* print out the properties we got, for debugging */
for (j = 0; j < nprops; j++)
printf ("property %s\n", plist[j]->name);
}
/* grab and print out the comments in the file */
comments = ply_get_comments (ply, &num_comments);
for (i = 0; i < num_comments; i++)
printf ("comment = '%s'\n", comments[i]);
/* grab and print out the object information */
obj_info = ply_get_obj_info (ply, &num_obj_info);
for (i = 0; i < num_obj_info; i++)
printf ("obj_info = '%s'\n", obj_info[i]);
/* close the PLY file */
ply_close (ply);
}
void PlyUtility::readPlyFile(char *filename)
{
int i,j;
/* open a PLY file for reading */
ply = ply_open_for_reading(filename, &nelems, &elist, &file_type, &version);
/* go through each kind of element that we learned is in the file */
/* and read them */
for (i = 0; i < nelems; i++) {
/* get the description of the first element */
elem_name = elist[i];
plist = ply_get_element_description (ply, elem_name, &num_elems, &nprops);
/* if we're on vertex elements, read them in */
if (equal_strings ("vertex", elem_name)) {
vertexCount=num_elems;
/* create a vertex list to hold all the vertices */
vlist = (Vertex **) malloc (sizeof (Vertex *) * num_elems);
/* set up for getting vertex elements */
ply_get_property (ply, elem_name, &vert_props[0]);
ply_get_property (ply, elem_name, &vert_props[1]);
ply_get_property (ply, elem_name, &vert_props[2]);
/* grab all the vertex elements */
for (j = 0; j < num_elems; j++) {
/* grab and element from the file */
vlist[j] = (Vertex *) malloc (sizeof (Vertex));
ply_get_element (ply, (void *) vlist[j]);
if(vx_max<vlist[j]->x)vx_max=vlist[j]->x;
if(vy_max<vlist[j]->y)vy_max=vlist[j]->y;
if(vz_max<vlist[j]->z)vz_max=vlist[j]->z;
if(vx_min>vlist[j]->x)vx_min=vlist[j]->x;
if(vy_min>vlist[j]->y)vy_min=vlist[j]->y;
if(vz_min>vlist[j]->z)vz_min=vlist[j]->z;
}
}
/* if we're on face elements, read them in */
if (equal_strings ("face", elem_name)) {
faceCount=num_elems;
/* create a list to hold all the face elements */
flist = (Face **) malloc (sizeof (Face *) * num_elems);
/* set up for getting face elements */
ply_get_property (ply, elem_name, &face_props[0]);
ply_get_property (ply, elem_name, &face_props[1]);
/* grab all the face elements */
for (j = 0; j < num_elems; j++) {
/* grab and element from the file */
flist[j] = (Face *) malloc (sizeof (Face));
ply_get_element (ply, (void *) flist[j]);
}
}
}
/* grab and print out the comments in the file */
comments = ply_get_comments (ply, &num_comments);
/* grab and print out the object information */
obj_info = ply_get_obj_info (ply, &num_obj_info);
/* close the PLY file */
ply_close (ply);
}
void
read_file(FILE *inFile)
{
int i,j,k;
PlyFile *ply;
int nprops;
int num_elems;
PlyProperty **plist;
char *elem_name;
float version;
int get_nx,get_ny,get_nz;
/*** Read in the original PLY object ***/
ply = ply_read (inFile, &nelems, &elist);
ply_get_info (ply, &version, &file_type);
for (i = 0; i < nelems; i++) {
/* get the description of the first element */
elem_name = elist[i];
plist = ply_get_element_description (ply, elem_name, &num_elems, &nprops);
if (equal_strings ("vertex", elem_name)) {
/* see if vertex holds any normal information */
get_nx = get_ny = get_nz = 0;
for (j = 0; j < nprops; j++) {
if (equal_strings ("nx", plist[j]->name)) get_nx = 1;
if (equal_strings ("ny", plist[j]->name)) get_ny = 1;
if (equal_strings ("nz", plist[j]->name)) get_nz = 1;
}
/* create a vertex list to hold all the vertices */
vlist = (Vertex **) malloc (sizeof (Vertex *) * num_elems);
nverts = num_elems;
/* set up for getting vertex elements */
ply_get_property (ply, elem_name, &vert_props[0]);
ply_get_property (ply, elem_name, &vert_props[1]);
ply_get_property (ply, elem_name, &vert_props[2]);
if (get_nx) ply_get_property (ply, elem_name, &vert_props[3]);
if (get_ny) ply_get_property (ply, elem_name, &vert_props[4]);
if (get_nz) ply_get_property (ply, elem_name, &vert_props[5]);
vert_other = ply_get_other_properties (ply, elem_name,
offsetof(Vertex,other_props));
/* grab all the vertex elements */
for (j = 0; j < num_elems; j++) {
vlist[j] = (Vertex *) malloc (sizeof (Vertex));
ply_get_element (ply, (void *) vlist[j]);
}
}
else if (equal_strings ("face", elem_name)) {
/* create a list to hold all the face elements */
flist = (Face **) malloc (sizeof (Face *) * num_elems);
nfaces = num_elems;
/* set up for getting face elements */
ply_get_property (ply, elem_name, &face_props[0]);
face_other = ply_get_other_properties (ply, elem_name,
offsetof(Face,other_props));
/* grab all the face elements */
for (j = 0; j < num_elems; j++) {
flist[j] = (Face *) malloc (sizeof (Face));
ply_get_element (ply, (void *) flist[j]);
}
}
else
other_elements = ply_get_other_element (ply, elem_name, num_elems);
}
comments = ply_get_comments (ply, &num_comments);
obj_info = ply_get_obj_info (ply, &num_obj_info);
ply_close (ply);
}
void
Grid::read_ply_file(char* file_name, const int triangle_type) {
// Vertex definition
typedef struct Vertex {
float x,y,z; // space coordinates
} Vertex;
// Face definition. This is the same for all files but is placed here to keep all the definitions together
typedef struct Face {
unsigned char nverts; // number of vertex indices in list
int* verts; // vertex index list
} Face;
// list of property information for a vertex
// this varies depending on what you are reading from the file
PlyProperty vert_props[] = {
{"x", PLY_FLOAT, PLY_FLOAT, offsetof(Vertex,x), 0, 0, 0, 0},
{"y", PLY_FLOAT, PLY_FLOAT, offsetof(Vertex,y), 0, 0, 0, 0},
{"z", PLY_FLOAT, PLY_FLOAT, offsetof(Vertex,z), 0, 0, 0, 0}
};
// list of property information for a face.
// there is a single property, which is a list
// this is the same for all files
PlyProperty face_props[] = {
{"vertex_indices", PLY_INT, PLY_INT, offsetof(Face,verts),
1, PLY_UCHAR, PLY_UCHAR, offsetof(Face,nverts)}
};
// local variables
int i,j;
PlyFile* ply;
int nelems; // number of element types: 2 in our case - vertices and faces
char** elist;
int file_type;
float version;
int nprops; // number of properties each element has
int num_elems; // number of each type of element: number of vertices or number of faces
PlyProperty** plist;
Vertex** vlist;
Face** flist;
char* elem_name;
int num_comments;
char** comments;
int num_obj_info;
char** obj_info;
// open a ply file for reading
ply = ply_open_for_reading(file_name, &nelems, &elist, &file_type, &version);
// print what we found out about the file
printf ("version %f\n", version);
printf ("type %d\n", file_type);
// go through each kind of element that we learned is in the file and read them
for (i = 0; i < nelems; i++) { // there are only two elements in our files: vertices and faces
// get the description of the first element
elem_name = elist[i];
plist = ply_get_element_description (ply, elem_name, &num_elems, &nprops);
// print the name of the element, for debugging
cout << "element name " << elem_name << " num elements = " << num_elems << " num properties = " << nprops << endl;
// if we're on vertex elements, read in the properties
if (equal_strings ("vertex", elem_name)) {
// set up for getting vertex elements
// the three properties are the vertex coordinates
ply_get_property (ply, elem_name, &vert_props[0]);
ply_get_property (ply, elem_name, &vert_props[1]);
ply_get_property (ply, elem_name, &vert_props[2]);
// reserve mesh elements
mesh_ptr->num_vertices = num_elems;
mesh_ptr->vertices.reserve(num_elems);
// grab all the vertex elements
for (j = 0; j < num_elems; j++) {
Vertex* vertex_ptr = new Vertex;
// grab an element from the file
ply_get_element (ply, (void *) vertex_ptr);
mesh_ptr->vertices.push_back(Point3D(vertex_ptr->x, vertex_ptr->y, vertex_ptr->z));
delete vertex_ptr;
}
}
// if we're on face elements, read them in
if (equal_strings ("face", elem_name)) {
// set up for getting face elements
ply_get_property (ply, elem_name, &face_props[0]); // only one property - a list
mesh_ptr->num_triangles = num_elems;
objects.reserve(num_elems); // triangles will be stored in Compound::objects
// the following code stores the face numbers that are shared by each vertex
mesh_ptr->vertex_faces.reserve(mesh_ptr->num_vertices);
vector<int> faceList;
for (j = 0; j < mesh_ptr->num_vertices; j++)
mesh_ptr->vertex_faces.push_back(faceList); // store empty lists so that we can use the [] notation below
// grab all the face elements
int count = 0; // the number of faces read
for (j = 0; j < num_elems; j++) {
// grab an element from the file
Face* face_ptr = new Face;
ply_get_element (ply, (void *) face_ptr);
// construct a mesh triangle of the specified type
if (triangle_type == flat) {
FlatMeshTriangle* triangle_ptr = new FlatMeshTriangle(mesh_ptr, face_ptr->verts[0], face_ptr->verts[1], face_ptr->verts[2]);
triangle_ptr->compute_normal(reverse_normal);
objects.push_back(triangle_ptr);
}
if (triangle_type == smooth) {
SmoothMeshTriangle* triangle_ptr = new SmoothMeshTriangle(mesh_ptr, face_ptr->verts[0], face_ptr->verts[1], face_ptr->verts[2]);
triangle_ptr->compute_normal(reverse_normal); // the "flat triangle" normal is used to compute the average normal at each mesh vertex
objects.push_back(triangle_ptr); // it's quicker to do it once here, than have to do it on average 6 times in compute_mesh_normals
// the following code stores a list of all faces that share a vertex
// it's used for computing the average normal at each vertex in order(num_vertices) time
mesh_ptr->vertex_faces[face_ptr->verts[0]].push_back(count);
mesh_ptr->vertex_faces[face_ptr->verts[1]].push_back(count);
mesh_ptr->vertex_faces[face_ptr->verts[2]].push_back(count);
count++;
}
}
if (triangle_type == flat)
mesh_ptr->vertex_faces.erase(mesh_ptr->vertex_faces.begin(), mesh_ptr->vertex_faces.end());
}
// print out the properties we got, for debugging
for (j = 0; j < nprops; j++)
printf ("property %s\n", plist[j]->name);
} // end of for (i = 0; i < nelems; i++)
// grab and print out the comments in the file
comments = ply_get_comments (ply, &num_comments);
for (i = 0; i < num_comments; i++)
printf ("comment = '%s'\n", comments[i]);
// grab and print out the object information
obj_info = ply_get_obj_info (ply, &num_obj_info);
for (i = 0; i < num_obj_info; i++)
printf ("obj_info = '%s'\n", obj_info[i]);
// close the ply file
ply_close (ply);
}
