| # | Line 27 | Line 27 | register VIEW *v; | |
|---|---|---|
| 27 | if (normalize(v->vdir) == 0.0) /* normalize direction */ | |
| 28 | return("zero view direction"); | |
| 29 | ||
| 30 | + | if (normalize(v->vup) == 0.0) /* normalize view up */ |
| 31 | + | return("zero view up vector"); |
| 32 | + | |
| 33 | fcross(v->hvec, v->vdir, v->vup); /* compute horiz dir */ | |
| 34 | ||
| 35 | if (normalize(v->hvec) == 0.0) | |
| 36 | < | return("illegal view up vector"); |
| 36 | > | return("view up parallel to view direction"); |
| 37 | ||
| 38 | fcross(v->vvec, v->hvec, v->vdir); /* compute vert dir */ | |
| 39 | ||
| – | Removed lines |
| + | Added lines |
| < | Changed lines |
| > | Changed lines |