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They even employ 3D scanning equipment to perform comprehensive data mapping of live models or specific reference subjects, thereby capturing authentic skeletal spacing, facial depth, and precise spatial relationships among the facial features of lifelike sex doll heads. Through biometric data capture, designers gain a crystal-clear understanding of how light and shadow play across a real human face from various angles and under different lighting conditions—insights they then leverage to enrich and refine the 3D modeling process.