I do not know how to explain this in a title but I have a picture

How do I prevent the sand from going through the border and make it fill the hole

image

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So you can do one of two things. Fill it all in part by part and union it or use negative unions. Either way you should use unions and watch the video I linked for more information on them. Pretty much gotta cut it out with negative parts or fill it in the make it solid with normal sand parts.

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