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Oğuzhan Çevik
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‎.gitignore‎

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# Created by https://www.toptal.com/developers/gitignore/api/java,intellij+all
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# Edit at https://www.toptal.com/developers/gitignore?templates=java,intellij+all
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### Intellij+all ###
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# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio, WebStorm and Rider
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# Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839
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# User-specific stuff
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.idea/**/workspace.xml
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.idea/**/tasks.xml
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.idea/**/usage.statistics.xml
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.idea/**/dictionaries
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.idea/**/shelf
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# Generated files
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.idea/**/contentModel.xml
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# Sensitive or high-churn files
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.idea/**/dataSources/
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.idea/**/dataSources.ids
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.idea/**/dataSources.local.xml
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.idea/**/sqlDataSources.xml
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.idea/**/dynamic.xml
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.idea/**/uiDesigner.xml
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.idea/**/dbnavigator.xml
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# Gradle
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.idea/**/gradle.xml
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.idea/**/libraries
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# Gradle and Maven with auto-import
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# When using Gradle or Maven with auto-import, you should exclude module files,
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# since they will be recreated, and may cause churn. Uncomment if using
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# auto-import.
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# .idea/artifacts
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# .idea/compiler.xml
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# .idea/jarRepositories.xml
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# .idea/modules.xml
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# .idea/*.iml
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# .idea/modules
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# *.iml
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# *.ipr
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# CMake
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cmake-build-*/
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# Mongo Explorer plugin
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.idea/**/mongoSettings.xml
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# File-based project format
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*.iws
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# IntelliJ
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out/
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# mpeltonen/sbt-idea plugin
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.idea_modules/
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# JIRA plugin
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atlassian-ide-plugin.xml
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# Cursive Clojure plugin
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.idea/replstate.xml
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# Crashlytics plugin (for Android Studio and IntelliJ)
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com_crashlytics_export_strings.xml
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crashlytics.properties
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crashlytics-build.properties
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fabric.properties
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# Editor-based Rest Client
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.idea/httpRequests
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# Android studio 3.1+ serialized cache file
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.idea/caches/build_file_checksums.ser
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### Intellij+all Patch ###
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# Ignores the whole .idea folder and all .iml files
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# See https://github.com/joeblau/gitignore.io/issues/186 and https://github.com/joeblau/gitignore.io/issues/360
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.idea/
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# Reason: https://github.com/joeblau/gitignore.io/issues/186#issuecomment-249601023
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*.iml
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modules.xml
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.idea/misc.xml
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*.ipr
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# Sonarlint plugin
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.idea/sonarlint
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### Java ###
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# Compiled class file
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*.class
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# Log file
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*.log
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# BlueJ files
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*.ctxt
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# Mobile Tools for Java (J2ME)
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.mtj.tmp/
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# Package Files #
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*.jar
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*.war
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*.nar
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*.ear
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*.zip
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*.tar.gz
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*.rar
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# Target Directory #
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*/target/**
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# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
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hs_err_pid*
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# End of https://www.toptal.com/developers/gitignore/api/java,intellij+all

‎README.md‎

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### OBJ to glTF converter for Java :arrows_counterclockwise:
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This is a library for converting OBJ files into glTF assets. You can convert OBJ file embedded or binary.
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Usage examples :heavy_check_mark:
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* Convert OBJ file binary
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`
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String inputObjFilePath = "src/main/resources/model/model.obj";
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String inputMtlFileName = "model";
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String outputFilePath = "src/main/resources/model/output_binary/";
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String outputFileName = "model";
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BufferStrategy bufferStrategy = BufferStrategy.BUFFER_PER_FILE;
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IndicesComponentType indicesComponentType = IndicesComponentType.GL_UNSIGNED_SHORT;
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ConvertObjToGltf convertObjToGltf = new ConvertObjToGltf.Builder().inputObjFilePath(inputObjFilePath)
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.inputMtlFileName(inputMtlFileName).outputFilePath(outputFilePath).outputFileName(outputFileName)
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.bufferStrategy(bufferStrategy).indicesComponentType(indicesComponentType).build();
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convertObjToGltf.convert();
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`
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* Convert OBJ file embedded
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`
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String inputObjFilePath = "src/main/resources/model/model.obj";
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String inputMtlFileName = "model";
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String outputFilePath = "src/main/resources/model/output_binary/";
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String outputFileName = "model";
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BufferStrategy bufferStrategy = BufferStrategy.BUFFER_PER_FILE;
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IndicesComponentType indicesComponentType = IndicesComponentType.GL_UNSIGNED_SHORT;
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GltfWriteType gltfWriteType = GltfWriteType.EMBEDDED;
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ConvertObjToGltf convertObjToGltf = new ConvertObjToGltf.Builder().inputObjFilePath(inputObjFilePath)
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.inputMtlFileName(inputMtlFileName).outputFilePath(outputFilePath).outputFileName(outputFileName)
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.bufferStrategy(bufferStrategy).indicesComponentType(indicesComponentType).gltfWriteType(gltfWriteType).build();
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convertObjToGltf.convert();
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`
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You can see all of usage on ConvertObjToGltfTest.java
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You can see available input OBJ files and output files on src/main/resources/model/
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Thanks https://github.com/javagl/JglTF/tree/master/jgltf-obj

‎pom.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>io.github.oguzhancevik</groupId>
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<artifactId>obj2gltf</artifactId>
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<version>1.0-SNAPSHOT</version>
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<build>
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<plugins>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-compiler-plugin</artifactId>
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<configuration>
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<source>8</source>
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<target>8</target>
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</configuration>
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</plugin>
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</plugins>
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</build>
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<dependencies>
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<!-- https://mvnrepository.com/artifact/de.javagl/jgltf-model -->
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<dependency>
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<groupId>de.javagl</groupId>
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<artifactId>jgltf-model</artifactId>
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<version>2.0.0</version>
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</dependency>
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<!-- https://mvnrepository.com/artifact/de.javagl/obj -->
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<dependency>
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<groupId>de.javagl</groupId>
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<artifactId>obj</artifactId>
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<version>0.3.0</version>
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</dependency>
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<dependency>
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<groupId>junit</groupId>
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<artifactId>junit</artifactId>
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<version>4.13</version>
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<scope>test</scope>
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</dependency>
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</dependencies>
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</project>

‎src/main/java/io/github/oguzhancevik/obj2gltf/ConvertObjToGltf.java‎

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package io.github.oguzhancevik.obj2gltf;
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import de.javagl.jgltf.model.GltfConstants;
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import de.javagl.jgltf.model.GltfModel;
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import de.javagl.jgltf.model.GltfModels;
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import de.javagl.jgltf.model.io.GltfAsset;
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import de.javagl.jgltf.model.io.GltfModelWriter;
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import io.github.oguzhancevik.obj2gltf.creator.ObjGltfAssetCreatorV2;
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import io.github.oguzhancevik.obj2gltf.obj.BufferStrategy;
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import io.github.oguzhancevik.obj2gltf.obj.GltfWriteType;
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import io.github.oguzhancevik.obj2gltf.obj.IndicesComponentType;
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import java.io.File;
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import java.net.URI;
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import java.nio.file.Paths;
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import java.util.concurrent.TimeUnit;
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public class ConvertObjToGltf {
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private final String inputObjFilePath, inputMtlFileName, outputFilePath, outputFileName;
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private final BufferStrategy bufferStrategy;
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private final IndicesComponentType indicesComponentType;
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private final GltfWriteType gltfWriteType;
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public ConvertObjToGltf(Builder builder) {
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this.inputObjFilePath = builder.inputObjFilePath;
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this.inputMtlFileName = builder.inputMtlFileName;
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this.outputFilePath = builder.outputFilePath;
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this.outputFileName = builder.outputFileName;
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this.bufferStrategy = builder.bufferStrategy;
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this.indicesComponentType = builder.indicesComponentType;
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this.gltfWriteType = builder.gltfWriteType;
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}
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public static class Builder {
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private String inputObjFilePath, inputMtlFileName, outputFilePath, outputFileName;
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private BufferStrategy bufferStrategy;
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private IndicesComponentType indicesComponentType;
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private GltfWriteType gltfWriteType;
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public Builder inputObjFilePath(String inputObjFilePath) {
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this.inputObjFilePath = inputObjFilePath;
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return this;
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}
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public Builder inputMtlFileName(String inputMtlFileName) {
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this.inputMtlFileName = inputMtlFileName;
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return this;
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}
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public Builder outputFilePath(String outputFilePath) {
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this.outputFilePath = outputFilePath;
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return this;
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}
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public Builder outputFileName(String outputFileName) {
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this.outputFileName = outputFileName;
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return this;
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}
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public Builder bufferStrategy(BufferStrategy bufferStrategy) {
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this.bufferStrategy = bufferStrategy;
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return this;
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}
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public Builder indicesComponentType(IndicesComponentType indicesComponentType) {
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this.indicesComponentType = indicesComponentType;
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return this;
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}
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public Builder gltfWriteType(GltfWriteType gltfWriteType) {
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this.gltfWriteType = gltfWriteType;
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return this;
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}
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public ConvertObjToGltf build() {
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return new ConvertObjToGltf(this);
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}
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}
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public void convert() {
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try {
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long startTime = System.nanoTime();
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if (inputObjFilePath == null || inputObjFilePath.isEmpty())
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throw new NullPointerException("inputObjFilePath cannot be empty!");
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URI objUri = Paths.get(inputObjFilePath).toUri();
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if (bufferStrategy == null) throw new NullPointerException("bufferStrategy cannot be empty!");
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ObjGltfAssetCreatorV2 gltfAssetCreator = new ObjGltfAssetCreatorV2(bufferStrategy);
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if (indicesComponentType == null) throw new NullPointerException("indicesComponentType cannot be empty!");
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else if (indicesComponentType == IndicesComponentType.GL_UNSIGNED_BYTE)
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gltfAssetCreator.setIndicesComponentType(GltfConstants.GL_UNSIGNED_BYTE);
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else if (indicesComponentType == IndicesComponentType.GL_UNSIGNED_SHORT)
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gltfAssetCreator.setIndicesComponentType(GltfConstants.GL_UNSIGNED_SHORT);
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else if (indicesComponentType == IndicesComponentType.GL_UNSIGNED_INT)
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gltfAssetCreator.setIndicesComponentType(GltfConstants.GL_UNSIGNED_INT);
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GltfAsset gltfAsset = gltfAssetCreator.create(objUri, inputMtlFileName);
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GltfModel gltfModel = GltfModels.create(gltfAsset);
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GltfModelWriter gltfModelWriter = new GltfModelWriter();
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if (outputFilePath == null || outputFilePath.isEmpty())
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throw new NullPointerException("outputFilePath cannot be empty!");
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if (outputFileName == null || outputFileName.isEmpty())
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throw new NullPointerException("outputFileName cannot be empty!");
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File outputFile = new File(outputFilePath + "/" + outputFileName + ".gltf");
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File parentFile = outputFile.getParentFile();
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if (parentFile != null) parentFile.mkdirs();
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if (gltfWriteType == GltfWriteType.BINARY) gltfModelWriter.writeBinary(gltfModel, outputFile);
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else if (gltfWriteType == GltfWriteType.EMBEDDED) gltfModelWriter.writeEmbedded(gltfModel, outputFile);
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else gltfModelWriter.write(gltfModel, outputFile);
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long finishTime = System.nanoTime();
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long duration = finishTime - startTime;
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long seconds = TimeUnit.SECONDS.convert(duration, TimeUnit.NANOSECONDS);
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System.out.println(seconds + " seconds");
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} catch (Exception e) {
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e.printStackTrace();
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}
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}
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}

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