Patent ID: 8860733

Claim:
A device for displaying a cutting simulation for representing a shape of a workpiece in a voxel model to simulate a change in the shape of the workpiece by a cutting operation, the device comprising: a rendered workpiece image update section for managing a rendered workpiece image buffer and a rendered workpiece depth buffer to hold image data and depth distance data of a projected image of the workpiece and updating by ray tracing a portion in the rendered workpiece image buffer and the rendered workpiece depth buffer, the portion being associated with a rendering region corresponding to a change in the shape of the workpiece, wherein the rendered workpiece image update section starts ray tracing at a location defined by a non-updated previous depth distance and coordinates of a ray-traced pixel by selecting a cell that includes the starting location point, such that ray tracing is started from a surface of the workpiece image which has been cut away and proceeds deeper in a direction of a line of sight by reselecting a cell adjacent to the cell being processed via an interface among 6 interfaces of the cell on which the cell intersects the ray in a deeper position.