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/* Copyright (c) 1996 Regents of the University of California */ |
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/* Copyright (c) 1998 Silicon Graphics, Inc. */ |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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static char SCCSid[] = "$SunId$ SGI"; |
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#endif |
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/* |
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int rt; |
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double rw; |
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{ |
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double re; |
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|
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if ((r->parent = ro) == NULL) { /* primary ray */ |
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r->rlvl = 0; |
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r->rweight = rw; |
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copycolor(r->albedo, ro->albedo); |
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r->gecc = ro->gecc; |
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r->slights = ro->slights; |
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r->rweight = ro->rweight * rw; |
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r->crtype = ro->crtype | (r->rtype = rt); |
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VCOPY(r->rorg, ro->rop); |
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r->rweight = ro->rweight * rw; |
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/* estimate absorption */ |
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re = colval(ro->cext,RED) < colval(ro->cext,GRN) ? |
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colval(ro->cext,RED) : colval(ro->cext,GRN); |
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if (colval(ro->cext,BLU) < re) re = colval(ro->cext,BLU); |
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if (re > 0.) |
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r->rweight *= exp(-re*ro->rot); |
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} |
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rayclear(r); |
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return(r->rlvl <= maxdepth && r->rweight >= minweight ? 0 : -1); |
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backmat = rayshade(&br, back); |
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/* check for transparency */ |
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if (backmat ^ foremat) |
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if (backmat) |
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if (backmat && coef > FTINY) |
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raytrans(&fr); |
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else |
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else if (foremat && coef < 1.0-FTINY) |
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raytrans(&br); |
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/* mix perturbations */ |
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for (i = 0; i < 3; i++) |