| 摘要 |
In a graphics processing system, a bounding volume 20 representative of the volume of all or part of a scene to be rendered is defined. Then, when rendering an at least partially transparent object 21 that is within the bounding volume 20 in the scene, a rendering pass for part or all of the object 21 is performed in which the object 21 is rendered as if it were an opaque object. In the rendering pass, for at least one sampling position 23 on a surface of the object 21, the colour to be used to represent the part of the refracted scene that will be visible through the object 21 at the sampling position 23 is determined by using a view vector 24 from a viewpoint position 25 for the scene to determine a refracted view vector 26 for the sampling position 23, determining the position 28 on the bounding volume 20 intersected by the refracted view vector 26, using the intersection position 28 to determine a vector 29 to be used to sample a graphics texture that represents the colour of the surface of the bounding volume 20 in the scene, and using the determined vector 29 to sample the graphics texture to determine a colour for the sampling position 23 to be used to represent the part of the refracted scene that will be visible through the object 21 at the sampling position 23 and any other relevant information encoded in one or more channels of the texture. |
