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Correct the sign for the shift in frac.

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However, this is not entirely correct as the new start point when testing
the other side of the plane also needs to be calculated.
This commit is contained in:
Bill Currie 2011-11-12 18:53:05 +09:00
parent b82d9f5894
commit fa6390a46a
2 changed files with 7 additions and 2 deletions
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5
libs/models/test/testclip.c
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@ -212,6 +212,11 @@ test_t tests[] = {
{ -16, 0, 8}, {16, 0, 24}, { 0.25, 0, 0, 1, 0}},
{"Box, Step 1", &box, &hull_step1,
{ -16, 0, 8}, {16, 0, 40}, { 0.25, 0, 0, 1, 0}},
{"Box, Step 1", &box, &hull_step1,
{ -16, 0, 8}, {16, 0, 135}, { 0.25, 0, 0, 1, 0}},
// 136 is a corner case caused by back/front side issues and 0
{"Box, Step 1", &box, &hull_step1,
{ -16, 0, 8}, {16, 0, 137}, { 1, 0, 0, 1, 0}},
};
#define num_tests (sizeof (tests) / sizeof (tests[0]))

4
libs/models/trace.c
View file

@ -209,9 +209,9 @@ MOD_TraceLine (hull_t *hull, int num,
side = start_dist < 0;
if (side)
frac = (start_dist + offset) / (start_dist - end_dist);
else
frac = (start_dist - offset) / (start_dist - end_dist);
else
frac = (start_dist + offset) / (start_dist - end_dist);
frac = bound (0, frac, 1);
tstack->num = num;