Method for hybrid rasterization and raytracing with consistent programmable shading
View Patent ↗A method of generating a computer image wherein secondary raytrace vectors are calculated for the image after the image is rendered using rasterization. The secondary raytrace vectors are based on virtual camera angles that are stored during the rasterization process. The raytrace vectors can be calculated using the same processor as the rasterization, thereby providing greater consistency in the image. A metaprogrammed shader can also be applied to the generated image, wherein the shader uses the same processor as the raytrace and rasterization steps. The metaprogrammed shader allows the shader algorithm to be segmented for streamlined processing by the processor.
1. A method of rendering a computer image formed of a plurality of pixels, comprising:
identifying, using at least one computing device, a first set of pixels in the image that have properties for which raytracing is advantageous;
rasterizing the image, using the at least one computing device, wherein an array of direction vectors is created as part of the rasterizing, the array storing a direction vector from a virtual camera and associated with each polygon vertex in the image;
identifying a second set of pixels, using the at least one computing device, wherein the second set of pixels is comprised of those pixels in the first set of pixels which are also in the foreground of the image; and,
spawning at least one secondary ray from each pixel in the second set of pixels, using the at least one computing device, wherein the at least one secondary ray is spawned from the respective pixel by using the directional vector associated with the polygon vertices to which the respective pixel relates.
2. The method of claim 1 , wherein the properties for which ray tracing is advantageous includes pixels containing reflective materials.
3. The method of claim 1 , wherein the properties for which ray tracing is advantageous includes pixels containing refractive materials.
4. The method of claim 1 , wherein the properties for which ray tracing is advantageous includes pixels containing reflective and refractive materials.
5. The method of claim 1 , wherein the first set of pixels is automatically generated.
6. A method comprising the steps:
evaluating, using at least one computing device, an image, wherein a plurality of pixels that relate to polygon vertices are identified, each of the vertices including at least one property selected from the list: reflective material, refractive material;
generating, using the at least one computing device, the image using rasterization, wherein an array, stored on a computer readable medium, is created that comprises a directional vector from a virtual camera that is associated with each polygon vertex;
evaluating, using the at least one computing device, each of the plurality of pixels to determine if the respective pixel is in a foreground of the image;
generating, using the at least one computing device, a secondary ray for each pixel in the foreground of the image, wherein the secondary ray is generated from the respective pixel by using the directional vector associated with the polygon vertices to which the respective pixel relates.
7. A method comprising the steps:
identifying, using at least one computing device, in an image comprising a plurality of polygons, at least one of the polygons having a property selected from the list: reflective surface, refractive surface;
for each of the plurality of polygons,
rasterizing, using at least one computing device, the respective polygon, wherein if the respective polygon has at least one property selected from the list: reflective surface, refractive surface, the polygon is raytraced.