Hi,
The gaps are due to the low resolution of the coordinates used to render your image. Large coordinate values (with, say 5-6 significant decimal digits or more), have low resolution.
To close these gaps you need to:
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Make the origin of the world close to your viewpoint. I recommend putting it at the viewpoint as a best practice.
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If the gaps don’t close after step 1, then the coordinates of the pipeline vertices are too large (and therefore low resolution). So make them also relative to the world position of your viewpoint. When there should be no low-resolution numbers used to render the scene and the gaps will close.
There are a number of posts in this forum relating to this type of issue. I will see if I can find specific links for you.