Rendering hair

A hair rendering apparatus, comprising:

• processing circuitry configured to:
• obtain main light source information of a virtual main light source disposed in a virtual environment, the main light source information including a light source position and a light source direction of the virtual main light source that change with time, and the virtual main light source acting on a hair area of a virtual image;
• obtain a longitudinal angle, an azimuthal angle, illumination information, and color information of a pixel in the hair area corresponding to each optical path of the virtual main light source, each optical path of the virtual main light source including a respective reflection optical path, a respective transmission optical path, and a respective transmission reflection transmission optical path;
• determine, for each optical path of the virtual main light source, (i) a respective longitudinal scattering amount based on the corresponding longitudinal angle of the pixel and the corresponding illumination information of the pixel, (ii) a respective azimuthal scattering amount based on the corresponding azimuthal angle of the pixel, and (iii) a respective scattering amount of the pixel corresponding to the respective optical path according to the longitudinal scattering amount, the azimuthal scattering amount, and the corresponding color information of the pixel;
• and
• fuse scattering amounts of the pixel corresponding to the optical paths of the virtual main light source to obtain first coloring information of the pixel corresponding to the virtual main light source, hair in the hair area of the virtual image being rendered based on the first coloring information.

A non-transitory computer-readable storage medium storing instructions which when executed by a processor cause the processor to perform:

• obtaining main light source information of a virtual main light source disposed in a virtual environment, the main light source information including a light source position and a light source direction of the virtual main light source that change with time, and the virtual main light source acting on a hair area of a virtual image;
• obtaining a longitudinal angle, an azimuthal angle, illumination information, and color information of a pixel in the hair area corresponding to each optical path of the virtual main light source, each optical path of the virtual main light source including a respective reflection optical path, a respective transmission optical path, and a respective transmission reflection transmission optical path;
• determining, for each optical path of the virtual main light source, (i) a respective longitudinal scattering amount based on the corresponding longitudinal angle of the pixel and the corresponding illumination information of the pixel, (ii) a respective azimuthal scattering amount based on the corresponding azimuthal angle of the pixel, and (iii) a respective scattering amount of the pixel corresponding to the respective optical path according to the longitudinal scattering amount, the azimuthal scattering amount, and the corresponding color information of the pixel;
• and
• fusing scattering amounts of the pixel corresponding to the optical paths of the virtual main light source to obtain first coloring information of the pixel corresponding to the virtual main light source, hair in the hair area of the virtual image being rendered based on the first coloring information.