Coding method, decoding method, and device

A decoding method, comprising:

• decoding, by a decoder, an obtained bitstream, to obtain first information, wherein the first information comprises at least one of the following:
• first precision geometric information, second precision geometric information, or information about a supplementary point;
• and
• performing, by the decoder, dequantization according to the first information, to obtain a target three-dimensional mesh, wherein
• the first precision geometric information is quantized geometric information of the target three-dimensional mesh, the second precision geometric information is geometric information lost in a quantization process of the target three-dimensional mesh, and the information about the supplementary point is information about a point that is generated in the quantization process and that needs additional processing.

A decoding device, comprising a processor and a memory, wherein a program or instructions are stored in the memory and executable on the processor, and the program or the instructions, when executed by the processor, cause the decoding device to perform:

• decoding an obtained bitstream, to obtain first information, wherein the first information comprises at least one of the following:
• first precision geometric information, second precision geometric information, or information about a supplementary point;
• and
• performing dequantization according to the first information, to obtain a target three-dimensional mesh, wherein
• the first precision geometric information is quantized geometric information of the target three-dimensional mesh, the second precision geometric information is geometric information lost in a quantization process of the target three-dimensional mesh, and the information about the supplementary point is information about a point that is generated in the quantization process and that needs additional processing.