func WrapMesh(m *gomesh.Mesh) *Mesh {
m.ReindexVerticesAndFaces()
// also wrap vertices; i.e. replaces mesh.Vertex with shapeset.vertex
for i := 0; i < m.Vertices.Len(); i++ {
if v, ok := m.Vertices.Get(i)[0].(*gomesh.Vertex); ok {
m.Vertices.Update(i, &Vertex{Vertex: *v})
}
}
// also wrap faces and update them to reference outer vertex object
for i := 0; i < m.Faces.Len(); i++ {
if fx, ok := m.Faces.Get(i)[0].(*gomesh.Face); ok {
f := &Face{Face: *fx}
f.SetA(m.Vertices.Get(f.GetA().GetLocationInMesh(m))[0])
f.SetB(m.Vertices.Get(f.GetB().GetLocationInMesh(m))[0])
f.SetC(m.Vertices.Get(f.GetC().GetLocationInMesh(m))[0])
m.Faces.Update(i, f)
f.GetA().AddFace(f)
f.GetB().AddFace(f)
f.GetC().AddFace(f)
}
}
// iterate faces, build set of edges
vert_pairs := make(map[gomesh.VertexPair]*Edge)
m.Faces.EachWithIndex(func(i int, f gomesh.FaceI) {
pairs := [3]gomesh.VertexPair{
gomesh.MakeVertexPair(f.GetA(), f.GetB()),
gomesh.MakeVertexPair(f.GetB(), f.GetC()),
gomesh.MakeVertexPair(f.GetC(), f.GetA()),
}
for i, pair := range pairs {
var e *Edge
if e1, exists := vert_pairs[pair]; !exists {
e = &Edge{VertexPair: pair}
e.V1.(*Vertex).AddEdge(e)
e.V2.(*Vertex).AddEdge(e)
vert_pairs[pair] = e
} else {
e = e1
}
e.AddFace(f.(*Face))
f.(*Face).Edges[i] = e
}
})
return &Mesh{
Mesh: *m,
Borders: make(map[BorderId]*Border),
BoundingBox: m.BoundingBox(),
}
}
func NewEdge(v1, v2 *Vertex) *Edge {
a := gomesh.MakeVertexPair(v1, v2)
return &Edge{
VertexPair: a,
}
}
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
}