replenishment and drainage computer 138 could be configured to displace support 110 on a desired distance along each of the three coordinate axes computer 138 could also be configured to receive object 108 design data from a computer aided design cad system 142 and adapt the design data to a particular manufacturing process typically cad system 142 would not be a part or a component of additive manufacturing apparatus 100 although computer 138 of apparatus 100 could run suitable cad software to facilitate object 108 preview and other operations that could assist apparatus 100 operation fig2 is a schematic illustration of a cross section of the bottom of the container according to an example the known apparatuses or systems for additive manufacture of 3d objects typically in what is termed as down up additive manufacture have a transparent bottom with flat surfaces and each cured layer is also flat in the present apparatus 100 bottom 104 of container 102 includes a surface 200 that bears a 3d pattern 208 and the cured solidified or solid layer 204 of the radiation curable resin is a replica of the 3d pattern 208 of bottom surface 200 which is in contact with the radiation curable resin 106 the 3d pattern that surface 200 bears could be a periodic pattern or a non periodic pattern it could be a periodic pattern in at least one direction or two directions or all three directions the period of the 3d pattern that surface 200 bears could be the same in all of the three directions or different in at least one direction a variety of 3d patterns such as for example patterns 208 408 508 and others could be produced on surface 200 fig3 a.