void RigidBodyBullet::reload_space_override_modificator() {
// Make sure that kinematic bodies have their total gravity calculated
if (!is_active() && PhysicsServer::BODY_MODE_KINEMATIC != mode)
return;
Vector3 newGravity(space->get_gravity_direction() * space->get_gravity_magnitude());
real_t newLinearDamp(linearDamp);
real_t newAngularDamp(angularDamp);
AreaBullet *currentArea;
// Variable used to calculate new gravity for gravity point areas, it is pointed by currentGravity pointer
Vector3 support_gravity(0, 0, 0);
int countCombined(0);
for (int i = areaWhereIamCount - 1; 0 <= i; --i) {
currentArea = areasWhereIam[i];
if (PhysicsServer::AREA_SPACE_OVERRIDE_DISABLED == currentArea->get_spOv_mode()) {
continue;
}
/// Here is calculated the gravity
if (currentArea->is_spOv_gravityPoint()) {
/// It calculates the direction of new gravity
support_gravity = currentArea->get_transform().xform(currentArea->get_spOv_gravityVec()) - get_transform().get_origin();
real_t distanceMag = support_gravity.length();
// Normalized in this way to avoid the double call of function "length()"
if (distanceMag == 0) {
support_gravity.x = 0;
support_gravity.y = 0;
support_gravity.z = 0;
} else {
support_gravity.x /= distanceMag;
support_gravity.y /= distanceMag;
support_gravity.z /= distanceMag;
}
/// Here is calculated the final gravity
if (currentArea->get_spOv_gravityPointDistanceScale() > 0) {
// Scaled gravity by distance
support_gravity *= currentArea->get_spOv_gravityMag() / Math::pow(distanceMag * currentArea->get_spOv_gravityPointDistanceScale() + 1, 2);
} else {
// Unscaled gravity
support_gravity *= currentArea->get_spOv_gravityMag();
}
} else {
support_gravity = currentArea->get_spOv_gravityVec() * currentArea->get_spOv_gravityMag();
}
switch (currentArea->get_spOv_mode()) {
///case PhysicsServer::AREA_SPACE_OVERRIDE_DISABLED:
/// This area does not affect gravity/damp. These are generally areas
/// that exist only to detect collisions, and objects entering or exiting them.
/// break;
case PhysicsServer::AREA_SPACE_OVERRIDE_COMBINE:
/// This area adds its gravity/damp values to whatever has been
/// calculated so far. This way, many overlapping areas can combine
/// their physics to make interesting
newGravity += support_gravity;
newLinearDamp += currentArea->get_spOv_linearDamp();
newAngularDamp += currentArea->get_spOv_angularDamp();
++countCombined;
break;
case PhysicsServer::AREA_SPACE_OVERRIDE_COMBINE_REPLACE:
/// This area adds its gravity/damp values to whatever has been calculated
/// so far. Then stops taking into account the rest of the areas, even the
/// default one.
newGravity += support_gravity;
newLinearDamp += currentArea->get_spOv_linearDamp();
newAngularDamp += currentArea->get_spOv_angularDamp();
++countCombined;
goto endAreasCycle;
case PhysicsServer::AREA_SPACE_OVERRIDE_REPLACE:
/// This area replaces any gravity/damp, even the default one, and
/// stops taking into account the rest of the areas.
newGravity = support_gravity;
newLinearDamp = currentArea->get_spOv_linearDamp();
newAngularDamp = currentArea->get_spOv_angularDamp();
countCombined = 1;
goto endAreasCycle;
case PhysicsServer::AREA_SPACE_OVERRIDE_REPLACE_COMBINE:
/// This area replaces any gravity/damp calculated so far, but keeps
/// calculating the rest of the areas, down to the default one.
newGravity = support_gravity;
newLinearDamp = currentArea->get_spOv_linearDamp();
newAngularDamp = currentArea->get_spOv_angularDamp();
countCombined = 1;
break;
}
}
endAreasCycle:
if (1 < countCombined) {
newGravity /= countCombined;
newLinearDamp /= countCombined;
newAngularDamp /= countCombined;
}
btVector3 newBtGravity;
G_TO_B(newGravity * gravity_scale, newBtGravity);
btBody->setGravity(newBtGravity);
btBody->setDamping(newLinearDamp, newAngularDamp);
}
PhysicsServer::AreaSpaceOverrideMode BulletPhysicsServer::area_get_space_override_mode(RID p_area) const {
AreaBullet *area = area_owner.get(p_area);
ERR_FAIL_COND_V(!area, PhysicsServer::AREA_SPACE_OVERRIDE_DISABLED);
return area->get_spOv_mode();
}