Lifting parameter syntax refinements for v-dmc

A method for decoding encoded mesh data, the method comprising:

• determining, based on the encoded mesh data, a base mesh with a first set of vertices;
• subdividing the base mesh to determine an additional set of vertices for the base mesh;
• determining one or more lifting transform parameters, wherein determining the one or more lifting transform parameters comprises:
• receiving a first flag, wherein a first value of the first flag indicates that the one or more lifting transform parameters are to be updated and a second value for the flag indicates that the one or more lifting transform parameters are not to be updated;
• receiving a second flag in response to the first flag being equal to the first value, wherein a first value for the second flag indicates that lifting transform parameters are signaled at a level of detail (LoD) level and a second value for the second flag indicates that the lifting transform parameters are not signaled at the LoD level;
• updating the one or more lifting transform parameters in response to the second flag being equal to the second value;
• and
• determining one or more updated lifting transform parameters based on the lifting transform parameters;
• determining one or more displacement vectors based on the one or more updated lifting transform parameters;
• deforming the base mesh, deforming the base mesh comprises modifying locations of the additional set of vertices based on the one or more displacement vectors;
• and
• determining a decoded mesh based on the deformed base mesh.

A computer-readable storage medium storing instructions that when executed by one or more processors causes the one or more processors to:

• determine, based on encoded mesh data, a base mesh with a first set of vertices;
• subdivide the base mesh to determine an additional set of vertices for the base mesh;
• determine one or more lifting transform parameters, wherein to determine the one or more lifting transform parameters, the instructions cause the one or more processors to:
• receive a first flag, wherein a first value of the first flag indicates that the one or more lifting transform parameters are to be updated and a second value for the flag indicates that the one or more lifting transform parameters are not to be updated;
• receive a second flag in response to the first flag being equal to the first value, wherein a first value for the second flag indicates that lifting transform parameters are signaled at a level of detail (LoD) level and a second value for the second flag indicates that the lifting transform parameters are not signaled at the LoD level;
• update the one or more lifting transform parameters in response to the second flag being equal to the second value;
• and
• determine one or more updated lifting transform parameters based on the lifting transform parameters;
• determine one or more displacement vectors based on the one or more updated lifting transform parameters;
• deform the base mesh, wherein to deform the base mesh, the one more processing units are configured to modify locations of the additional set of vertices based on the one or more displacement vectors;
• and
• determine a decoded mesh based on the deformed base mesh.