公开(公告)号：JPH1079045A

公开(公告)日：1998-03-24

申请号：JP19375296

申请日：1996-07-23

Applicant: IBM

Inventor： AONO MASAKI ,  OBUCHI RYUTARO ,  MUROHASHI SHIGEO

IPC: G06T15/80 ,  G06T15/50

Abstract: PROBLEM TO BE SOLVED: To render a spot light with texture at a high speed. SOLUTION: At the time of rendering a three-dimensional space with the spot light source of a conical angle θ, the surface of an object within the three- dimensional space is meshed to be plural elements 310 at first. Then a radiosity from the spot light source is calculated with respect to each element included within the conical angle at the time of looking from the spot light source 320. After then, the luminance value of each vertex of each element is calculated from the radiosity calculated for each element 330. Then through the use of the luminance value of each vertex of each element, Gouraud shading is executed 380 to display the result on a display or the like.

公开(公告)号：JPH06337940A

公开(公告)日：1994-12-06

申请号：JP12579293

申请日：1993-05-27

Applicant: IBM

Inventor： ONO MAKOTO ,  MUROHASHI SHIGEO ,  OKUYAMA KENICHI

IPC: G06F9/455 ,  G06T11/00 ,  G06F15/72

Abstract: PURPOSE: To efficiently emulate the graphic system of a conventional architecture by the graphic system of a new architecture. CONSTITUTION: The result of interpretation is held for a plotting instruction and plotting data, and after interpretation is performed once, the held interpreted result is taken out as a rule without performing the interpretation again. At the time of interpreting the plotting instruction of a pertinent line first, the instruction and relating plotting data are interpreted (25 and 30) and held as shadow data (32). At the time of executing the plotting instruction of the pertinent line thereafter, the shadow data are retrieved and plotting is executed. When a program is changed, the shadow data of a changed part are discriminated and the shadow data are eliminated.