Information processing apparatus and non-transitory computer readable medium for determining attribute value of voxel

A non-transitory computer readable medium storing a program causing a computer to execute a process for information processing, the process comprising:

• acquiring volume data,
• the volume data representing a three-dimensional space by using a plurality of voxels,
• the volume data containing a geometric layer and at least one attribute layer,
• the geometric layer being formed by geometric voxels included in the plurality of voxels, each of the geometric voxels being assigned a characteristic value representing a three-dimensional shape of a target object,
• the at least one attribute layer being formed by attribute voxels included in the plurality of voxels, each of the attribute voxels being assigned an attribute value of the target object or an attribute value in a region around the target object,
• each of the at least one attribute layer corresponding to an attribute and being formed by voxels having a plurality of resolution levels,
• an attribute, a voxel position, and a resolution level being specified;
• accepting the specified attribute, the specified voxel position, and the specified resolution level;
• and
• if a voxel that corresponds to the specified voxel position in an attribute layer corresponding to the specified attribute in the volume data and that corresponds to a resolution level coinciding with the specified resolution level is absent,
• determining an attribute value of the voxel that corresponds to the specified voxel position and the specified resolution level in the attribute layer corresponding to the specified attribute, the attribute value being determined using a multi-way tree equation set to identify a voxel that corresponds to the specified voxel position at the attribute layer.