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Fix bug where entities won't shadow points inside their own collision radius

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Partial fix for issue #94 (needs a bit more doing for rock hermits, where the docking tunnel extends so deep into the object the "nearer sun than object" test unshadows the camera)
This commit is contained in:
cim 2014-06-19 18:52:11 +01:00
parent 44d12970af
commit a1efd52f9a
1 changed files with 12 additions and 1 deletions
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13
src/Core/CollisionRegion.m
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@ -477,7 +477,18 @@ BOOL shadowAtPointOcclusionToValue(HPVector e1pos, GLfloat e1rad, Entity *e2, OO
// double theta_sun = asin( cr_sun / sqrt(d2_sun)); // 1/2 angle subtended by sun
// double theta_e2 = asin( cr_e2 / sqrt(d2_e2)); // 1/2 angle subtended by e2
// find the difference between the angles subtended by occluder and sun
float theta_diff = asin(cr_e2 / sqrt(d2_e2)) - asin(cr_sun / sqrt(d2_sun));
float d2_e = sqrt(d2_e2);
float theta_diff;
if (d2_e < cr_e2)
{
// then we're "inside" the object. Calculate as if we were on
// the edge of it to avoid taking asin(x>1)
theta_diff = asin(1) - asin(cr_sun / sqrt(d2_sun));
}
else
{
theta_diff = asin(cr_e2 / d2_e) - asin(cr_sun / sqrt(d2_sun));
}
HPVector p_sun = the_sun->position;
HPVector p_e2 = e2->position;