1. Roblox Studio

Exporting from Blender:

• Select your model in Blender.
• Navigate to File > Export > FBX (.fbx).
• In the export settings, enable "Selected Objects" and set the path mode to "Copy" with the "Embed Textures" option checked.

Importing into Roblox Studio:

• Open Roblox Studio and access the Asset Manager.
• Use the "Bulk Import" feature to import the FBX file.
• Insert the imported mesh into your scene.
• If textures don't appear automatically, upload the texture files separately and apply them using the TextureID property of the MeshPart.

2. Unreal Engine

Exporting from Blender:

• Select your model in Blender.
• Go to File > Export > FBX (.fbx).
• In the export settings, ensure "Selected Objects" is enabled, and set the path mode to "Copy" with "Embed Textures" checked.

Importing into Unreal Engine:

• Open your Unreal Engine project.
• Use the Content Browser to import the FBX file.
• During import, ensure that "Import Textures" and "Import Materials" are enabled.
• After importing, verify that the materials and textures are correctly assigned.

3. Godot Engine

Exporting from Blender:

• Select your model in Blender.
• Export the model in GLTF format by navigating to File > Export > glTF 2.0 (.glb/.gltf).
• In the export settings, enable "Selected Objects" and ensure that materials and textures are included.

Importing into Godot:

• Place the exported GLTF file and associated texture files into your Godot project's directory.
• Godot will automatically detect and import the model.
• Verify that the materials and textures are correctly applied in the Godot editor.

4. Unity

• Exporting from Blender:
• Select your model in Blender.
• Export the model as an FBX file via File > Export > FBX (.fbx).
• In the export settings, enable "Selected Objects" and set the path mode to "Copy" with "Embed Textures" checked.
• Importing into Unity:
• Open your Unity project.
• Drag and drop the FBX file into the Unity Assets folder.
• Unity will import the model along with its materials.
• If textures are not automatically applied, ensure that the texture files are in the same directory and assign them manually in the material inspector.