MLPs integrated with illumination information. They are composed of two parts: MLP_light and MLP_shadow. In well-lit regions on the asteroid surface, MLP_light takes as input the positional encoded (PE) camera centers (o) and SH coefficients (c) of 3D Gaussian primitives to regress the red-green-blue colors. In shadowed regions, MLP_shadow additionally incorporates the hash-encoded (HE) mean (μ) of 3D Gaussian primitives and the angle (θ) between each primitive and the incident light to perform the regression of red-green-blue colors.