A method and system is provided for generating a perception scene graph (PSG) having a focus region for a motor vehicle. Information is collected about a volume of space including surrounding areas adjacent a motor vehicle by a plurality of external sensors. The information is processed by a perception controller to generate the PSG having a virtual three-dimensional (3-D) model of the volume of space and area adjacent the motor vehicle. The perception controller is configured to allocate variable processing power to process selected portions of the collected sensor information. At least one focus region is defined. A focus region is a sub-set of the volume of space and/or area adjacent the motor vehicle. Processing power is increased by the perception controller to process the portions of the collected information relating to the focus region such that a high fidelity 3-D model of the focus region is generated.