How to Convert 3D Models in Java

This guide shows how to convert 3D models between OBJ, STL, glTF, and FBX formats in Java using aspose-3d-foss. Format conversion with aspose-3d-foss is a two-step operation: load the source with scene.open(), then save to the target with scene.save().

Step-by-Step Guide

Step 1: Install the Package

Add the following Maven dependency to your pom.xml:

<dependency>
  <groupId>com.aspose</groupId>
  <artifactId>aspose-3d-foss</artifactId>
  <version>26.1.0</version>
</dependency>

Step 2: Load and Convert

Create a Scene, open the source file, and save to the target format:

import com.aspose.threed.Scene;

Scene scene = new Scene();
scene.open("input.fbx");
scene.save("output.glb");

The output format is inferred from the file extension.

Step 3: Use Save Options

Pass format-specific SaveOptions to control the output, for example to export binary GLB:

import com.aspose.threed.GltfSaveOptions;
import com.aspose.threed.FileContentType;

GltfSaveOptions opts = new GltfSaveOptions();
opts.setContentType(FileContentType.BINARY);
scene.save("output.glb", opts);

Note: FBX is read-only in aspose-3d-foss. Saving to .fbx throws ExportException. Export your scene to OBJ, STL, or glTF/GLB instead.

Common Conversion Recipes

Source	Target	Notes
OBJ to GLB	Binary glTF for web	`scene.open("in.obj"); scene.save("out.glb");`
FBX to STL	Triangulated for 3D printing	`scene.open("in.fbx"); scene.save("out.stl");`
STL to OBJ	Wavefront for modelling	`scene.open("in.stl"); scene.save("out.obj");`

Frequently Asked Questions (FAQ)

Does conversion preserve materials?

Material mapping is best-effort. Not all formats carry the same material properties.

Can I batch-convert files?

Create a new Scene for each file. Each instance is independent.