Voxel data processing using attributes thereof

A computer program product stored on a computer readable medium for processing a three-dimensional image comprising:

• means for memorizing at least one attribute for each of a plurality of voxels fixedly filling a predetermined three-dimensional space;
• means for specifying, in a slant direction of a slant representation of the predetermined three-dimensional space on a display screen, a depth position within the predetermined three-dimensional space in response to a first user input;
• means for specifying a position in a plane having the specified depth position in response to a second user input;
• means for specifying a value for each of the one or more attributes in response to a third user input;
• means for modifying each of the at least one attribute of a voxel located at the specified position in the plane having the specified depth position, to the specified value;
• and
• means for displaying voxels in at least a part of the predetermined three-dimensional space on the display screen as the three-dimensional images in accordance with the attributes of the voxels, wherein modification of the depth position by means of the first user input causes a series of specified voxels to have corresponding different positions on the display screen.