main.go

/*
Package main shows how to use the 'gwob' package to parse geometry data from OBJ files.

See also: https://github.com/udhos/gwob
*/
package main

import (
	"fmt"
	"log"
	"os"

	"github.com/udhos/gwob"
)

func main() {

	fileObj := os.Getenv("INPUT")
	if fileObj == "" {
		fileObj = "red_cube.obj"
	}
	log.Printf("env var INPUT=[%s] using input=%s", os.Getenv("INPUT"), fileObj)

	// Set options
	options := &gwob.ObjParserOptions{
		LogStats: true,
		Logger:   func(msg string) { fmt.Fprintln(os.Stderr, msg) },
	}

	// Load OBJ
	o, errObj := gwob.NewObjFromFile(fileObj, options)
	if errObj != nil {
		log.Printf("obj: parse error input=%s: %v", fileObj, errObj)
		return
	}

	fileMtl := o.Mtllib

	// Load material lib
	lib, errMtl := gwob.ReadMaterialLibFromFile(fileMtl, options)
	if errMtl != nil {
		log.Printf("mtl: parse error input=%s: %v", fileMtl, errMtl)
	} else {

		// Scan OBJ groups
		for _, g := range o.Groups {

			mtl, found := lib.Lib[g.Usemtl]
			if found {
				log.Printf("obj=%s lib=%s group=%s material=%s MapKd=%s Kd=%v", fileObj, fileMtl, g.Name, g.Usemtl, mtl.MapKd, mtl.Kd)
				continue
			}

			log.Printf("obj=%s lib=%s group=%s material=%s NOT FOUND", fileObj, fileMtl, g.Name, g.Usemtl)
		}

	}

	if len(os.Args) < 2 {
		log.Printf("no cmd line args - dump to stdout suppressed")
		return
	}

	log.Printf("cmd line arg found - dumping to stdout")

	// Dump to stdout
	o.ToWriter(os.Stdout)
}