# | Line 461 | Line 461 | makeambient( /* make a new ambient value for storage | |
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461 | /* compute ambient */ | |
462 | i = doambient(acol, r, amb.weight, uvw, amb.rad, amb.gpos, amb.gdir); | |
463 | scalecolor(acol, 1./AVGREFL); /* undo assumed reflectance */ | |
464 | < | if (i <= 0) /* no Hessian => no storage */ |
464 | > | if (i <= 0 || amb.rad[0] <= FTINY) /* no Hessian or zero radius */ |
465 | return(i); | |
466 | /* store value */ | |
467 | VCOPY(amb.pos, r->rop); |
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