Importing 3D models into game engines

General

Refrain from using OBJ unless it's the only supported file format.
GLB (glTF 2.0) files have embedded textures, there’s no need to import texture files.
FBX, GLB (glTF 2.0) and DAE files are equal in features but GLB are always smaller in size.
You can open OBJ, FBX and DAE files using any text editor to edit them.
STL files do not include materials or textures, they're meant for 3D printing.

Isometric

If there's isometric renders included with a 3D package they'll be 512 × 512 in size, a flat single tile is 128 × 64 in size. The transparent pixels around each of the tiles is margin for larger tiles, or tiles that don't fit within the usual tile size.

Tiled

Tileset properties: Set the drawing offset to X: -192 and Y: 170.

Map properties: Set tile width and height to 128 × 64.

Unity

Supported formats: OBJ, DAE and FBX
Recommended format: FBX or DAE

Instructions

Drag model files into "Project" pane or add to your "Assets" project folder. Make sure to also import the "Textures" folder, if included.

Unreal Engine

Supported formats: OBJ and FBX
Recommended format: FBX

Instructions

Click Import in the "Content Browser" pane and select a model. In the "Import Options" dialog set the "Import Uniform Scale" to 10.

For FBX models: Ignore the warning about smoothing groups, the model will work just fine.

For OBJ models: In the import dialog set "Import rotation" to 90 × 0 × 0.

Godot

Supported formats: OBJ, DAE, FBX and GLTF
Recommended format: GLTF

Instructions

Copy model files to your project folder, if there’s a "Texture" folder make sure to copy that too.

Blender

Supported formats: OBJ, DAE and STL
Recommended format: DAE
Also includes: Armory Engine, Blender Game Engine

Instructions

File ➤ Import and select the file format you’d like to import, then select a file.

Three.js

Supported formats: OBJ, DAE, GLTF and STL
Recommended format: GLTF

Instructions

Please see the Three.js documentation for instructions on how to import files.

BabylonJS

Supported formats: OBJ and GLTF
Recommended format: GLTF

Instructions

Please see the BabylonJS documentation for instructions on how to import files.

PlayCanvas

Supported formats: OBJ, DAE and FBX
Recommended format: FBX

Instructions

Drag model files into "Assets" pane or add click the plus symbol in the "Assets" pane and select "Upload".

For OBJ models: Materials are unsupported.

For FBX/DAE models: Textures don't get applied, select the corresponding material and add the texture to "Diffuse".

CryEngine

Supported formats: FBX
Recommended format: FBX

Instructions

Drag model files into "Asset Browser" pane or add to your project folder.

Note: Materials and textures are unsupported.

Lumberyard