Your depth map 3D model is noisy mainly due to low-quality input data, incorrect depth estimation settings, or reconstruction artifacts.
Low-quality inputs (blurry photos, poor lighting) make depth calculations less accurate, over-sensitive settings add false depth values, and reconstruction tools often amplify small errors into visible noise.
Try using well-lit, sharp input images, capturing more overlapping shots, or adjusting your software’s depth smoothing settings—this cuts noise without losing key details.