各プリミティブの中心に点作成

	float bound[] = primintrinsic(@OpInput1, "bounds", @primnum);
	vector min = set(bound[0], bound[2], bound[4]);
	vector max = set(bound[1], bound[3], bound[5]);
	addpoint(geoself(),avg(min,max));
	removeprim(geoself(),@primnum,1);

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