Some problem with fur option on v-ray 3.4

[bagtoshop]

hi i tried to make a hole in the grass that has fur in v-ray 3.4 for a pool.
but the pool tile matriel is also influence by the grass fur.
can you please explain me how making the pool tiles without the fur of the grass ?
attachd photo

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[Missy_X]

Make sure that your grass is a separate object from the pool tiles (or anything else really). Also could be that your grass object has a thickness and that's what i'm seeing come through the pool tiles (hard to tell from looking at this picture). This isn't needed, a flat plane works for grass too.