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Microtexture for close-in detail
| Details |
Inventors: Buchner, Gregory C.; Fadden, Jr., Richard G.;
Assignee: General Electric Company (Syracuse, NY)
Primary Examiner: Clark; David L.
Assistant Examiner:
Attorney, Agent or Firm: Checkovich; Paul, Lang; Richard V.
In a computer image generation system, as a viewpoint approaches a surface of an object and is closer than a predetermined threshold distance from the surface, a texture pattern obtained from cell data becomes fuzzy, and may not provide adequate motion cues for training, such as piloting an airplane. In accordance with the present invention, apparatus and method provide random data at a predetermined derived level of detail for combining with cell data to define the surface including texture of the object when the object is closer to the viewpoint than the threshold distance. The apparatus may be readily retrofitted into an existing system. |
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DETAILED DESCRIPTION Referring to FIG.
1, a block diagram of microtexture circuitry for presenting close-in detail in accordance with the present invention is shown.
Attention is directed to copending application Ser.
No.
865,591, filed May 21, 1986, entitled, "Advanced Video Object Generator"--Bunker et al, now U.
S.
Pat.
No.
4,865,591, which is incorporated herein in its entirety by reference thereto, for an explanation of cell texturing in general, and for cell smoothing and cell blending in particular.
The microtexture circuitry of the present invention includes apparatus for simultaneously processing data for the same area of a scene to be displayed at two different LOD's.
LOD(M) data, defining texture and/or features for an area of a scene to be displayed is supplied from a texture cell map storage means 12, such as a random access memory (RAM), to the input of an LOD(M) cell smoothing circuit 30, and LOD(M-1) data, defining texture and/or features at a greater resolution than data for LOD(M) of the area of the scene to be displayed is supplied from cell map storage 12 to the input of an LOD(M-1) cell smoothing circuit 20 through a multiplexer 18.
Multiplexer 18, which functions analogously to a double pole, single throw switch, is controlled by the LOD(M)=LOD(0) signal so that when LOD(M) is not equal to LOD(0), the LOD(M-1) data signal is supplied to LOD(M-1) cell smoothing circuit 20.
When LOD(M) is equal to LOD(0), mini-cell data from a mini-cell map storage means 14, such as a RAM, is supplied through an attenuation control circuit 16 and multiplexer 18 to the input of cell smoothing circuit 20.
The output of LOD(M) cell smoothing circuitry 30 is coupled to an input of cell blend circuitry 40 for LOD(M) and LOD(M-1).
The output of LOD(M-1) cell smoothing circuitry 20 is coupled to another input of cell blend circuitry 40 through a combiner circuit 25.
The output of LOD(M) smoothing circuit 30 is also connected to an input of combiner circuit 25 through switch means 33, such as an AND gate
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Graphic Cards 
