00001 /*
00002 File: AnaMesh.cc
00003
00004 Function: See header file
00005
00006 Author(s): Andrew Willmott
00007
00008 Copyright: (c) 1997-2000, Andrew Willmott
00009
00010 */
00011
00012 #include "AnaMesh.h"
00013 #include "AnaRad.h"
00014
00015 Colour AnaGrid::Sample(Coord c)
00016 // calculate radiosity using PatchFactor directly
00017 {
00018 Int i, j;
00019 Colour patchCol;
00020 GCLReal s = c[0];
00021 GCLReal t = c[1];
00022 AnaRad *rad = (AnaRad*) gRadControl->radObject;
00023
00024 Point p = Vertex(1) + s * (Vertex(2) - Vertex(1))
00025 + t * (Vertex(0) - Vertex(1));
00026
00027 patchCol = cBlack;
00028
00029 for (j = 0; j < rad->lights.NumItems(); j++)
00030 patchCol += rad->lights[j]->Emittance()
00031 * rad->lights[j]->PatchFactor(p, Normal());
00032
00033 patchCol *= Reflectance();
00034 patchCol += Emittance();
00035
00036 return(patchCol);
00037 }
