Collision-culling of lines over polygons

A method to reduce collision burden by culling in 2D projections a certainly not colliding ray segments over a group of polygons in a scene of computer graphics system, comprising:

• [1] sub-dividing a scene of polygon data into multiple cells, each cell holding a sub-scene;
• [2] at each polygon-populated cell within the grid of cells
• [2a ] projecting polygon data into a first 2D projection viewed orthographically along a first axis, creating first orthographic visible stencil with projected areas and clear areas;
• [2b ] projecting polygon data into second 2D projection viewed orthographically along a second axis, creating second orthographic visible stencil with projected areas and clear areas;
• [2c ] projecting polygon data into third 2D projection viewed orthographically along a third axis, creating third orthographic visible stencil with projected areas and clear areas;
• [2d ] projecting each 3D ray in the cell into first projection along the first axis to create 2D orthographic projection of said ray;
• [2e ] culling 2D ray segments that overlap with the clear areas of the first 2D orthographic visible stencil;
• [2f ] projecting remaining 3D ray segments into second projection along the second axis to create 2D orthographic projection;
• [2g ] culling 2D ray segments that overlap with clear areas of the second 2D orthographic visible stencil;
• [2h ] projecting remaining 3D ray segments into the third projection along the third axis to create 2D orthographic projection;
• [2i ] culling 2D ray segments that overlap with clear areas of the third 2D orthographic visible stencil, whereas remaining ray segments are subject to collision tests vs. local polygons;
• [3] wherein said culling reduces the amount of required collision tests in the forthcoming collision stage between rays and local polygons.