/
io.go
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/
io.go
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package shapeset
import (
"bufio"
"encoding/json"
"errors"
"github.com/nat-n/geom"
gomesh "github.com/nat-n/gomesh/mesh"
"io"
"io/ioutil"
"os"
"regexp"
"sort"
"strconv"
"strings"
)
type meshParseSchema struct {
Name string `json:"name"`
Verts string `json:"verts"`
Norms string `json:"norms"`
Faces string `json:"faces"`
Borders map[string]string `json:"borders"`
}
type shapeSetParseSchema struct {
Name string `json:"name"`
Shapes map[string]string `json:"shapes"`
Meshes []*meshParseSchema `json:"meshes"`
}
func Load(ss_reader *io.Reader) (ss *ShapeSet, err error) {
// Parse json from reader and load with temporary types
parsed_data := new(shapeSetParseSchema)
err = json.NewDecoder(*ss_reader).Decode(parsed_data)
if err != nil {
err = errors.New("Could not parse json from ss_reader")
return
}
// for building up partial border info from meshes
border_tracker := make(map[BorderId]map[MeshId][]*Vertex)
meshesBuffer := make([]*Mesh, 0)
for _, mesh_data := range parsed_data.Meshes {
var verts, norms []float64
var faces []int
mesh_name := mesh_data.Name
m := NewMesh(mesh_name)
// load vertices from parsed data
verts, err = parseCSFloats(mesh_data.Verts)
vertexBuffer := make([]gomesh.VertexI, 0, len(verts)/3)
if err != nil {
err = errors.New("Could not parse vertices for: " + mesh_name)
return
}
for i := 0; i < len(verts); i += 3 {
vertexBuffer = append(vertexBuffer, &Vertex{Vertex: gomesh.Vertex{
Vec3: geom.Vec3{verts[i], verts[i+1], verts[i+2]},
Meshes: make(map[gomesh.Mesh]int),
}})
}
// Vertex normals are optional
if len(mesh_data.Norms) > 0 {
norms, err = parseCSFloats(mesh_data.Norms)
if err != nil {
err = errors.New("Could not parse normals for: " + mesh_name)
return
}
if len(norms) != 0 && len(norms) != len(verts) {
err = errors.New("Malformed Mesh (vertices/normals mismatch): " + mesh_name)
return
}
for i := 0; i < len(norms); i += 3 {
vertexBuffer[i/3].SetNormal(&geom.Vec3{norms[i], norms[i+1], norms[i+2]})
}
}
edges := make(map[gomesh.VertexPair]*Edge)
// load faces from parsed data
faces, err = parseCSInts(mesh_data.Faces)
faceBuffer := make([]gomesh.FaceI, 0, len(faces)/3)
if err != nil {
err = errors.New("Could not parse faces for: " + mesh_name)
return
}
for i := 0; i < len(faces); i += 3 {
// create new face from vertex triple
vA := vertexBuffer[faces[i]]
vB := vertexBuffer[faces[i+1]]
vC := vertexBuffer[faces[i+2]]
new_face := &Face{Face: gomesh.Face{Vertices: [3]gomesh.VertexI{vA, vB, vC}}}
// reference face from vertices
vA.AddFace(new_face)
vB.AddFace(new_face)
vC.AddFace(new_face)
faceBuffer = append(faceBuffer, new_face)
// find/create edges of new_face
e0 := gomesh.MakeVertexPair(vA, vB)
e1 := gomesh.MakeVertexPair(vB, vC)
e2 := gomesh.MakeVertexPair(vC, vA)
newPairs := [3]gomesh.VertexPair{e0, e1, e2}
for i, vp := range newPairs {
var f_edge *Edge
if e, exists := edges[vp]; exists {
f_edge = e
} else {
f_edge = &Edge{VertexPair: vp}
f_edge.Vertex1().AddEdge(f_edge)
f_edge.Vertex2().AddEdge(f_edge)
edges[vp] = f_edge
}
f_edge.AddFace(new_face)
new_face.Edges[i] = f_edge
}
}
for border_id, border_indices := range mesh_data.Borders {
var vert_indices []int
vert_indices, err = parseCSInts(border_indices)
if err != nil {
err = errors.New(
"Could not parse border for mesh " + m.GetName() +
" indices for border " + border_id + ", in mesh " + mesh_name)
return
}
bverts := make([]*Vertex, 0)
for _, vi := range vert_indices {
bverts = append(bverts, vertexBuffer[vi].(*Vertex))
}
bid, err := BorderIdFromString(border_id)
if err != nil {
panic(err.Error())
}
mid := MeshIdFromString(mesh_name)
if _, exists := border_tracker[bid]; !exists {
border_tracker[bid] = make(map[MeshId][]*Vertex)
}
border_tracker[bid][mid] = bverts
}
m.Vertices.Append(vertexBuffer...)
m.Faces.Append(faceBuffer...)
m.ReindexVerticesAndFaces()
m.BoundingBox = m.Mesh.BoundingBox()
meshesBuffer = append(meshesBuffer, m)
}
// Create ShapeSet
ss = New(parsed_data.Name, parsed_data.Shapes, meshesBuffer)
// merge border vertices
for border_id, mesh_borders := range border_tracker {
mesh_ids := ByMeshIdPrecedence{}
for mesh_id, _ := range mesh_borders {
mesh_ids = append(mesh_ids, mesh_id)
}
sort.Sort(mesh_ids)
first_mesh_vertices := mesh_borders[mesh_ids[0]]
for _, mesh_id := range mesh_ids[1:] {
secondary_mesh_vertices := mesh_borders[mesh_id]
for i := 0; i < len(first_mesh_vertices); i++ {
gomesh.MergeSharedVertices(
first_mesh_vertices[i],
secondary_mesh_vertices[i])
}
}
_, err = ss.BordersIndex.LoadBorder(
border_id,
[]MeshId(mesh_ids),
first_mesh_vertices,
)
if err != nil {
return
}
}
ss.BordersIndex.indexBorderEdges()
return
}
func (ss *ShapeSet) Save(ss_writer *io.Writer) (err error) {
// structure data for serialization
parsed_data := shapeSetParseSchema{
Name: ss.Name,
Shapes: make(map[string]string),
Meshes: make([]*meshParseSchema, 0, len(ss.Meshes)),
}
for shape_id, shape_name := range ss.Shapes {
parsed_data.Shapes[shape_id.ToString()] = shape_name
}
for mesh_name, m := range ss.Meshes {
m.ReindexVerticesAndFaces()
m.Vertices.EnsureNormals()
temp_mesh_data := meshParseSchema{
Name: mesh_name.ToString(),
Verts: m.Vertices.PositionsAsCSV(),
Norms: m.Vertices.NormalsAsCSV(),
Faces: m.Faces.IndicesAsCSV(),
Borders: make(map[string]string),
}
for border_id, border := range m.Borders {
// stringify border vertex indices
stringInts := make([]string, border.Len(), border.Len())
for i := 0; i < border.Len(); i++ {
bvi := border.Vertices[i].GetLocationInMesh(m)
stringInts[i] = strconv.FormatInt(int64(bvi), 10)
}
temp_mesh_data.Borders[border_id.ToString()] = strings.Join(stringInts, ",")
}
parsed_data.Meshes = append(parsed_data.Meshes, &temp_mesh_data)
}
err = json.NewEncoder(*ss_writer).Encode(&parsed_data)
if err != nil {
err = errors.New("Could not encode json for: " + ss.Name)
return
}
return nil
}
func ReadFile(ss_file_path string) (ss *ShapeSet, err error) {
// open file
input_file, err := os.Open(ss_file_path)
if err != nil {
return
}
defer input_file.Close()
// read from file
ss_reader := io.Reader(input_file)
ss, err = Load(&ss_reader)
return
}
func (ss *ShapeSet) WriteFile(ss_file_path string) (err error) {
// Serialized JSON and stream to a file
output_file, err := os.Create(ss_file_path)
if err != nil {
return
}
defer output_file.Close()
ss_writer := io.Writer(output_file)
ss.Save(&ss_writer)
return
}
/* Create a new shapeset from a json labels file and a directory of meshes.
*/
func CreateNew(meshes_dir, labels_path string) (ss *ShapeSet, err error) {
// Ensure meshes_dir ends with a slash
if meshes_dir[len(meshes_dir)-1] != 47 {
meshes_dir += "/"
}
// Attempt to read given paths
var label_data []byte
label_data, err = ioutil.ReadFile(labels_path)
if err != nil {
return
}
var files []os.FileInfo
files, err = ioutil.ReadDir(meshes_dir)
if err != nil {
return
}
// Load labels from json file
labels := make(map[string]string, 0)
var labels_temp interface{}
json.Unmarshal(label_data, &labels_temp)
for key, val := range labels_temp.(map[string]interface{}) {
labels[key] = val.(string)
}
// Load all meshes with the expected filename pattern (.obj) from the
// directory at meshes path.
meshes := make([]*Mesh, 0)
for _, f := range files {
r, _ := regexp.Compile(`^(\d+-\d+).obj$`)
if r.MatchString(f.Name()) == true {
mesh_file_path := meshes_dir + f.Name()
var m *gomesh.Mesh
m, err = gomesh.ReadOBJFile(mesh_file_path)
if err != nil {
return
}
m.Name = string(r.FindSubmatch([]byte(f.Name()))[1])
meshes = append(meshes, WrapMesh(m))
}
}
// Compose shapeset
ss = New("New ShapeSet", labels, meshes)
return
}
/* Loads a directory of meshes and replaces each location of a vertex currently
* in the shapeset with the location of the corresponding vertex (by index) in
* the identically named mesh file. The set of meshes and their topology is
* assumed to be the same as is present in the shapeset.
*/
func (ss *ShapeSet) ReloadVertices(meshes_dir string) {
// ensure meshes_dir ends with a slash
if meshes_dir[len(meshes_dir)-1] != 47 {
meshes_dir += "/"
}
// ensure meshes_dir is a directory
path_stat, err := os.Stat(meshes_dir)
if os.IsNotExist(err) || !path_stat.Mode().IsDir() {
panic(errors.New("Provided path for reloading meshes is not a directory"))
}
// collect border vertex positions to be averaged at the end
borders_vertices := make(map[*Vertex][]geom.Vec3I)
// reload vertices for all meshes in the shapeset
for _, m := range ss.Meshes {
mesh_file_path := meshes_dir + m.Name + ".obj"
if _, err = os.Stat(mesh_file_path); os.IsNotExist(err) {
return
}
// scan mesh file line by line to find vertex definitions
var file *os.File
file, err = os.Open(mesh_file_path)
if err != nil {
return
}
// setup for parsing
index := 0
line_no := -1
scanner := bufio.NewScanner(file)
for scanner.Scan() {
line_no++
// trim leading and trailing whitespace
line := strings.TrimSpace(scanner.Text())
// discard anything on this line after a #
if comment_start := strings.Index(line, "#"); comment_start >= 0 {
line = line[:comment_start]
}
// ignore empty lines
if len(line) == 0 {
continue
}
var new_vec geom.Vec3
words := strings.Fields(line)
if words[0] == "v" {
new_x, err_x := strconv.ParseFloat(words[1], 64)
new_y, err_y := strconv.ParseFloat(words[2], 64)
new_z, err_z := strconv.ParseFloat(words[3], 64)
if err_x != nil || err_y != nil || err_z != nil {
panic(errors.New(
"Error parsing OBJ file on line: " +
strconv.Itoa(line_no)))
}
new_vec = geom.Vec3{new_x, new_y, new_z}
} else {
// ignore lines that don't define a vertex
continue
}
v := m.Vertices.Get(index)[0]
vert := v.(*Vertex)
if vert.IsShared() {
// add border vertices, we'll then divide by number_of_meshes+1 to get
// the mean
borders_vertices[vert] = append(borders_vertices[vert], &new_vec)
} else {
vert.SetX(new_vec.X)
vert.SetY(new_vec.Y)
vert.SetZ(new_vec.Z)
}
// only incremented after parsing lines with a vertex
index++
}
if err = scanner.Err(); err != nil {
return
}
file.Close()
}
// Calculate border vertex positions as mean across meshes
ss.BordersIndex.Each(func(border *Border) {
for _, v := range border.Vertices {
mean_border_vec := borders_vertices[v][0].Mean(borders_vertices[v][1:]...)
v.X = mean_border_vec.X
v.Y = mean_border_vec.Y
v.Z = mean_border_vec.Z
}
})
return
}