A method for simulating spine surgery in a computer system is disclosed. The computer system is used for executing the following steps: (a) receiving a knife selection instruction for selecting a knife of cylinder, ellipse or cone shape (b) performing sample point setting to the knife according to the knife selection instruction (c) calculating a sweeping area of the knife (d) calculating a voxelization area of the knife, wherein the voxelization area comprises calculating closed straight lines formed by cross points with minimal and maximal distances to XY, YZ or XZ planes among a plurality of cross points including a knife surface and a knife edge passing surface in the X, Y and Z axles of a volume coordinate system (e) comparing the voxelization area with volume sample points to determine whether there is a cut (f) dynamically determining a knife sample point and (g) comparing the knife sample point with the voxelization area to determine a force of outputting a force feedback device. By means of simplifying the knife representation to perform rapid cross point calculation, the present invention can save time thereby achieving the rapidity effect.一種於電腦系統上模擬脊椎手術的方法,該電腦系統執行包括下述步驟:(a)接受一選擇一刀具種類為一圓柱體、一橢圓或一圓椎體之刀具選擇指令;(b)依據該刀具選擇指令進行該刀具之樣點設定;(c)計算該刀具掃過的範圍;(d)計算該刀具的一容積化範圍,該容積化範圍係計算在容積座標系統之XYZ軸中,在包含該刀具表面和刀具邊緣掃開面中的數個交點中,與XY、YZ或XZ平面距離最小和最大交點所構成的封閉直線;(e)將該容積化範圍與該容積樣點比對是否有切削;(f)動態決定一刀具樣點;及(g)該刀具樣點與該容積化範圍比對以決定輸出一力回饋器之力量。藉由簡化刀具表現以快速交點計算,因此可節省計算時間,達到快速化的效果。S10~S21...步驟S101~103...步驟S181~S186...步驟
