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Replace a non-aligned cuboid with a cylinder in client::ActiveObjectMgr::getActiveSelectableObjects

This commit is contained in:
numzero 2023-06-24 20:52:54 +03:00 committed by sfan5
parent 21035bf5d4
commit dde8f0e20a
1 changed files with 10 additions and 20 deletions
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30
src/client/activeobjectmgr.cpp
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@ -110,17 +110,8 @@ void ActiveObjectMgr::getActiveObjects(const v3f &origin, f32 max_d,
std::vector<DistanceSortedActiveObject> ActiveObjectMgr::getActiveSelectableObjects(const core::line3d<f32> &shootline)
{
std::vector<DistanceSortedActiveObject> dest;
// Imagine a not-axis-aligned cuboid oriented into the direction of the shootline,
// with the width of the object's selection box radius * 2 and with length of the
// shootline (+selection box radius forwards and backwards). We check whether
// the selection box center is inside this cuboid.
f32 max_d = shootline.getLength();
v3f dir = shootline.getVector().normalize();
// arbitrary linearly independent vector and orthogonal dirs
v3f li2dir = dir + (std::fabs(dir.X) < 0.5f ? v3f(1,0,0) : v3f(0,1,0));
v3f dir_ortho1 = dir.crossProduct(li2dir).normalize();
v3f dir_ortho2 = dir.crossProduct(dir_ortho1);
for (auto &ao_it : m_active_objects) {
ClientActiveObject *obj = ao_it.second;
@ -129,23 +120,22 @@ std::vector<DistanceSortedActiveObject> ActiveObjectMgr::getActiveSelectableObje
if (!obj->getSelectionBox(&selection_box))
continue;
// possible optimization: get rid of the sqrt here
f32 selection_box_radius = selection_box.getRadius();
v3f obj_center = obj->getPosition() + selection_box.getCenter();
f32 obj_radius_sq = selection_box.getExtent().getLengthSQ() / 4;
v3f pos_diff = obj->getPosition() + selection_box.getCenter() - shootline.start;
v3f c = obj_center - shootline.start;
f32 a = dir.dotProduct(c); // project c onto dir
f32 b_sq = c.getLengthSQ() - a * a; // distance from shootline to obj_center, squared
f32 d = dir.dotProduct(pos_diff);
if (b_sq > obj_radius_sq)
continue;
// backward- and far-plane
if (d + selection_box_radius < 0.0f || d - selection_box_radius > max_d)
f32 obj_radius = std::sqrt(obj_radius_sq);
if (a < -obj_radius || a > max_d + obj_radius)
continue;
// side-planes
if (std::fabs(dir_ortho1.dotProduct(pos_diff)) > selection_box_radius
|| std::fabs(dir_ortho2.dotProduct(pos_diff)) > selection_box_radius)
continue;
dest.emplace_back(obj, d);
dest.emplace_back(obj, a);
}
return dest;
}