245 |
|
break; |
246 |
|
case VT_PER: /* perspective view */ |
247 |
|
d = DOT(disp,v->vdir); |
248 |
< |
if ((v->vaft > FTINY) & (d > v->vaft)) |
248 |
> |
if ((v->vaft > FTINY) & (d >= v->vaft)) |
249 |
|
rflags |= VL_BEYOND; |
250 |
|
ip[2] = VLEN(disp); |
251 |
|
if (d < -FTINY) { /* fold pyramid */ |
275 |
|
d = d*d + d2*d2; |
276 |
|
if (d <= FTINY*FTINY) |
277 |
|
return(VL_BAD); /* at pole */ |
278 |
< |
if ((v->vaft > FTINY) & (d > v->vaft*v->vaft)) |
278 |
> |
if ((v->vaft > FTINY) & (d >= v->vaft*v->vaft)) |
279 |
|
rflags |= VL_BEYOND; |
280 |
|
d = 1.0/sqrt(d); |
281 |
|
ip[1] = DOT(disp,v->vvec)*d/v->vn2 + 0.5 - v->voff; |
315 |
|
ip[0] = DOT(disp,v->hvec)/v->hn2 + 0.5 - v->hoff; |
316 |
|
ip[1] = DOT(disp,v->vvec)/v->vn2 + 0.5 - v->voff; |
317 |
|
gotall: /* add appropriate return flags */ |
318 |
< |
rflags |= VL_BEHIND*(ip[2] <= 0.0); |
318 |
> |
if (!(rflags & (VL_BEHIND|VL_BEYOND))) |
319 |
> |
rflags |= (ip[2] <= 0.0) ? VL_BEHIND : |
320 |
> |
VL_BEYOND * ((v->vaft > FTINY) & |
321 |
> |
(ip[2] >= v->vaft - v->vfore)); |
322 |
|
rflags |= VL_OUTSIDE*((0.0 >= ip[0]) | (ip[0] >= 1.0) | |
323 |
|
(0.0 >= ip[1]) | (ip[1] >= 1.0)); |
321 |
– |
if ((v->vaft > FTINY) & !(rflags & (VL_BEHIND|VL_BEYOND))) |
322 |
– |
rflags |= VL_BEYOND*(ip[2] > v->vaft - v->vfore); |
324 |
|
return(rflags); |
325 |
|
} |
326 |
|
|