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[simd] Check the distance to the affine point

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As per usual, fp math finds a way to confound any epsilon test. So
rather than relying entirely on test_support_points, check the distance
from the sphere center to the affine point and break out of the loop if
the distance is small enough (< 1% of the current radius). This allows
qfvis to load ad_tears without hacks.
This commit is contained in:
Bill Currie 2021-07-29 15:15:14 +09:00
parent 45aa8e6504
commit 6d312aaa63
2 changed files with 14 additions and 2 deletions
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8
libs/util/mathlib.c
View file

@ -1443,11 +1443,17 @@ SmallestEnclosingBall (const vec3_t points[], int num_points)
if (iters++ > 10)
Sys_Error ("stuck SEB");
best = 0;
closest_affine_point (support, num_support, sphere.center, affine);
VectorSubtract (affine, sphere.center, center_to_affine);
affine_dist = DotProduct (center_to_affine, center_to_affine);
if (affine_dist < sphere.radius * 1e-5) {
// It's possible test_support_points failed due to precision
// issues
break;
}
best = 0;
for (i = 0; i < num_points; i++) {
if (points[i] == support[0] || points[i] == support[1]
|| points[i] == support[2])

8
libs/util/simd.c
View file

@ -288,11 +288,17 @@ SmallestEnclosingBall_vf (const vec4f_t *points, int num_points)
if (iters++ > 10)
Sys_Error ("stuck SEB");
best = 0;
affine = closest_affine_point (support, num_support, center);
center_to_affine = affine - center;
affine_dist = dotf (center_to_affine, center_to_affine)[0];
if (affine_dist < sphere.radius * 1e-5) {
// It's possible test_support_points failed due to precision
// issues
break;
}
best = 0;
for (i = 0; i < num_points; i++) {
if (&points[i] == support[0] || &points[i] == support[1]
|| &points[i] == support[2])