UeObjLoader

A .obj model loader. Supports vertex positions, normals, UVs, vertex colors, material groups, usemtl references, and .mtl material libraries.

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Constructor

new UeObjLoader()

Properties

Name	Type	Description
flipUV	Boolean	If true, UVs are flipped vertically (default true)
reverseWinding	Boolean	If true, triangle winding is reversed (default false)
materials	Struct	Dictionary of materials loaded from an .mtl file

Methods

Method Signature	Description
load(fname)	Loads and parses an .obj file from disk. Returns the root UeMesh.
setMaterials(materials)	Assigns a struct of materials (from UeMtlLoader) to enable usemtl.

Example

var mtlLoader = new UeMtlLoader();
var materials = mtlLoader.load("models/car.mtl");

var objLoader = new UeObjLoader();
objLoader.setMaterials(materials);

var mesh = objLoader.load("models/car.obj");
scene.add(mesh);

Notes

• Faces are triangulated automatically if needed.

• The loader uses the global.UE_VFORMAT_PNUTC vertex format.

• Since OBJ files do not natively store tangent data, default tangents (1, 0, 0, 1) are generated for compatibility with PBR shaders.

• Materials are not loaded automatically; use UeMtlLoader.

• No vertex deduplication is performed (each face defines separate vertices).

• Supports color-per-vertex if .obj includes RGB values in v.