An additive manufacturing system for generating a three-dimensional object, the additive manufacturing system comprising: a build material distributor to deposit a layer of powder-based build material, a coalescing agent distributor to selectively deliver coalescing agent to the layer of powder-based build material, and a controller to: obtain three-dimensional object design data representing the three-dimensional object; generate vector slice data for each slice of the three-dimensional object based on the three-dimensional object design data; and to cause the additive manufacturing system to generate a current slice comprising: cause the additive manufacturing system to provide a layer of powder-based build material; modify the vector slice data of the current slice based on characteristic data, the characteristic data being measured feedback based on measurements made during the build process, and/or stored characteristics of the additive manufacturing system; and based on the modified slice data, cause the additive manufacturing system to generate the current slice by selectively delivering coalescing agent to the layer of powder-based build material. a build material distributor to deposit a layer of powder-based build material, a coalescing agent distributor to selectively deliver coalescing agent to the layer of powder-based build material, and a controller to: obtain three-dimensional object design data representing the three-dimensional object; generate vector slice data for each slice of the three-dimensional object based on the three-dimensional object design data; and to cause the additive manufacturing system to generate a current slice comprising: cause the additive manufacturing system to provide a layer of powder-based build material; modify the vector slice data of the current slice based on characteristic data, the characteristic data being measured feedback based on measurements made during the build process, and/or stored characteristics of the additive manufacturing system; and based on the modified slice data, cause the additive manufacturing system to generate the current slice by selectively delivering coalescing agent to the layer of powder-based build material. obtain three-dimensional object design data representing the three-dimensional object; generate vector slice data for each slice of the three-dimensional object based on the three-dimensional object design data; and to cause the additive manufacturing system to generate a current slice comprising: cause the additive manufacturing system to provide a layer of powder-based build material; modify the vector slice data of the current slice based on characteristic data, the characteristic data being measured feedback based on measurements made during the build process, and/or stored characteristics of the additive manufacturing system; and based on the modified slice data, cause the additive manufacturing system to generate the current slice by selectively delivering coalescing agent to the layer of powder-based build material. cause the additive manufacturing system to provide a layer of powder-based build material; modify the vector slice data of the current slice based on characteristic data, the characteristic data being measured feedback based on measurements made during the build process, and/or stored characteristics of the additive manufacturing system; and based on the modified slice data, cause the additive manufacturing system to generate the current slice by selectively delivering coalescing agent to the layer of powder-based build material.