What causes lightmapping to result in this? [pic]

I’m thinking it’s possibly something to do with the UVs? The objects were created by a 3Ds Max modeler who’s a little inexperienced. Just wondering what information I can pass onto him to help solve the issue. Thanks :slight_smile:

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D’oh! Just had to select “Generate Lightmap UVs” on the model import options. :slight_smile: