diff options
| author | Brian Paul <[email protected]> | 2001-05-09 20:02:28 +0000 |
|---|---|---|
| committer | Brian Paul <[email protected]> | 2001-05-09 20:02:28 +0000 |
| commit | a41edc31ce81daf69157a345525933ca6c560004 (patch) | |
| tree | fedb95c9a2e9495b4767c6a3c85c41e4c6f6c821 /progs/demos/terrain.c | |
| parent | 61cb081a357e60e988ecfa2fd945a8d2657c49f0 (diff) | |
check for tiny values in dir[] vector in calcposobjs(), prevents FP underflows later
Diffstat (limited to 'progs/demos/terrain.c')
| -rw-r--r-- | progs/demos/terrain.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/progs/demos/terrain.c b/progs/demos/terrain.c index 2fe1df3a071..5b5ad3e1f7a 100644 --- a/progs/demos/terrain.c +++ b/progs/demos/terrain.c @@ -81,6 +81,13 @@ calcposobs(void) dir[2] = cos(alpha * M_PI / 180.0) * sin(beta * M_PI / 180.0); dir[1] = cos(beta * M_PI / 180.0); + if (dir[0] < 1.0e-5 && dir[0] > -1.0e-5) + dir[0] = 0; + if (dir[1] < 1.0e-5 && dir[1] > -1.0e-5) + dir[1] = 0; + if (dir[2] < 1.0e-5 && dir[2] > -1.0e-5) + dir[2] = 0; + alpha1 = alpha + FOV / 2.0; v1[0] = sin(alpha1 * M_PI / 180.0); v1[1] = cos(alpha1 * M_PI / 180.0); |