LUMION IS SHOWING UNWANTED LINES AND PLANES AFTER IMPORTING COLLADA FILE
And do you know how the model looks in SketchUp, with Hidden Geometry on, in the Monochrome style?
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In sketchup it looks good…only after importing collada file, these unwanted lines are coming
So they only exist in Lumion? Sounds like the problem isn’t in SketchUp. You should contact the Lumion folks for assistance.
You could share the .skp file with us so we could take a look and see if there’s any thing that might be done.
In SketchUp, these kind of artifacts often indicate that the model is located very far from the origin or has very large extents. I don’t know how this would affect Lumion. Is Collada the only available way to get your model into Lumion? As said, if you post the model or a link to it forum members might offer better guesses about what is going on.