Package obj is used to parse the Wavefront OBJ file format (*.obj), including associated materials (*.mtl). Not all features of the OBJ format are supported. Basic format info:



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    type Decoder

    type Decoder struct {
    	Objects   []Object             // decoded objects
    	Matlib    string               // name of the material lib
    	Materials map[string]*Material // maps material name to object
    	Vertices  math32.ArrayF32      // vertices positions array
    	Normals   math32.ArrayF32      // vertices normals
    	Uvs       math32.ArrayF32      // vertices texture coordinates
    	Warnings  []string             // warning messages
    	// contains filtered or unexported fields

      Decoder contains all decoded data from the obj and mtl files

      func Decode

      func Decode(objpath string, mtlpath string) (*Decoder, error)

        Decode decodes the specified obj and mtl files returning a decoder object and an error. Passing an empty string (or otherwise invalid path) to mtlpath will cause the decoder to check the 'mtllib' file in the OBJ if present, and fall back to a default material as a last resort.

        func DecodeReader

        func DecodeReader(objreader, mtlreader io.Reader) (*Decoder, error)

          DecodeReader decodes the specified obj and mtl readers returning a decoder object and an error if a problem was encoutered while parsing the OBJ.

          Pass a valid io.Reader to override the materials defined in the OBJ file, or `nil` to use the materials listed in the OBJ's "mtllib" line (if present), a ".mtl" file with the same name as the OBJ file if presemt, or a default material as a last resort. No error will be returned for problems with materials--a gray default material will be used if nothing else works.

          func (*Decoder) NewGeometry

          func (dec *Decoder) NewGeometry(obj *Object) (*geometry.Geometry, error)

            NewGeometry generates and returns a geometry from the specified object

            func (*Decoder) NewGroup

            func (dec *Decoder) NewGroup() (*core.Node, error)

              NewGroup creates and returns a group containing as children meshes with all the decoded objects. A group is returned even if there is only one object decoded.

              func (*Decoder) NewMesh

              func (dec *Decoder) NewMesh(obj *Object) (*graphic.Mesh, error)

                NewMesh creates and returns a mesh from an specified decoded object.

                type Face

                type Face struct {
                	Vertices []int  // Indices to the face vertices
                	Uvs      []int  // Indices to the face UV coordinates
                	Normals  []int  // Indices to the face normals
                	Material string // Material name
                	Smooth   bool   // Smooth face

                  Face contains all information about an object face

                  type Material

                  type Material struct {
                  	Name       string       // Material name
                  	Illum      int          // Illumination model
                  	Opacity    float32      // Opacity factor
                  	Refraction float32      // Refraction factor
                  	Shininess  float32      // Shininess (specular exponent)
                  	Ambient    math32.Color // Ambient color reflectivity
                  	Diffuse    math32.Color // Diffuse color reflectivity
                  	Specular   math32.Color // Specular color reflectivity
                  	Emissive   math32.Color // Emissive color
                  	MapKd      string       // Texture file linked to diffuse color

                    Material contains all information about an object material

                    type Object

                    type Object struct {
                    	Name  string // Object name
                    	Faces []Face // Faces
                    	// contains filtered or unexported fields

                      Object contains all information about one decoded object

                      Source Files