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Thank you for teaching me! I could do that I wanted Now, I am customizing it more useful ! thank you.

Hi Patis-san, For unpacked, you can write something like this (Point Wrangle): vector source = getbbox_center ( 0 ); vector target = point ( 1, "P", 0 ); matrix3 m = lookat ( source, target ); @P -= source; @P *= m; @P += source; For packed, you can write over the transform primitive intrinsic attribute. Since it's a matrix3, you don't have to worry about translation to origin and back (Primitive Wrangle): vector source = getbbox_center ( 0 ); vector target = point ( 1, "P", 0 ); matrix3 m = lookat ( source, target ); setprimintrinsic ( 0, "transform", @primnum, m );