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Physics engine: always resolve penetration, but apply impulse only on approach velocity

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This commit is contained in:
Nikita Lisitsa 2020-12-03 20:04:53 +03:00
parent b2b6d18dd0
commit a75b8710de
1 changed files with 54 additions and 61 deletions
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17
libs/phys/source/engine_2d.cpp
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@ -390,7 +390,7 @@ namespace psemek::phys2d
void apply_gravity(float dt);
void integrate(float dt);
bool resolve_collisions();
void resolve_collisions();
void log_energy();
float energy();
@ -447,10 +447,8 @@ namespace psemek::phys2d
}
}
bool engine::impl::resolve_collisions()
void engine::impl::resolve_collisions()
{
bool had_collision = false;
for (std::size_t gi = 0; gi < groups.size(); ++gi)
{
for (std::size_t gj = gi; gj < groups.size(); ++gj)
@ -473,8 +471,6 @@ namespace psemek::phys2d
if (c->penetration == geom::vector<float, 2>::zero()) continue;
// TODO: handle inv_mass == 0
auto const n = geom::normalized(c->penetration);
auto const & infoi = groups[gi].infos[i];
@ -491,10 +487,8 @@ namespace psemek::phys2d
auto const u = uj - ui;
if (geom::dot(u, n) > 0.f) continue;
had_collision = true;
if (geom::dot(u, n) < 0.f)
{
auto const & mati = materials[infoi.material];
auto const & matj = materials[infoj.material];
@ -546,6 +540,7 @@ namespace psemek::phys2d
groups[gi].dynamic_states[i].angular_velocity -= geom::det(ri, J) * infoi.inv_inertia;
groups[gj].dynamic_states[j].angular_velocity += geom::det(rj, J) * infoj.inv_inertia;
}
groups[gi].static_states[i].position -= c->penetration * infoi.inv_mass / (infoi.inv_mass + infoj.inv_mass);
groups[gj].static_states[j].position += c->penetration * infoj.inv_mass / (infoi.inv_mass + infoj.inv_mass);
@ -553,8 +548,6 @@ namespace psemek::phys2d
}
}
}
return !had_collision;
}
float engine::impl::energy()