proper fix that traces down the player when a cell is loaded; we also only run once if the current cell being loaded is the one that the player is in.

apps/openmw/mwphysics/physicssystem.cpp

@@ -2,7 +2,6 @@
 
 #include <LinearMath/btIDebugDraw.h>
 #include <LinearMath/btVector3.h>
-#include <algorithm>
 #include <memory>
 #include <osg/Group>
 #include <osg/Stats>
@@ -682,21 +681,6 @@ namespace MWPhysics
 
         auto actor = std::make_shared<Actor>(ptr, shape, mTaskScheduler.get());
 
-        if (ptr == MWMechanics::getPlayer())
-        {
-            osg::Vec3f offset = actor->getCollisionObjectPosition() - ptr.getRefData().getPosition().asVec3();
-            std::cout << "DEBUG Player position: " << actor->getPosition() << std::endl;
-            auto terrainHeight = std::max(0.f, MWBase::Environment::get().getWorld()->getTerrainHeightAt(actor->getPosition()));
-            std::cout << "DEBUG terrain height " << terrainHeight << std::endl;
-            ActorTracer tracer;
-            tracer.findGround(actor.get(), actor->getPosition() + offset, actor->getPosition() + offset - osg::Vec3f(0, 0, 100.f), mCollisionWorld.get());
-            std::cout << "DEBUG mFraction " << tracer.mFraction << std::endl; // it seems that player is loaded before the cell so we can't find the ground.
-
-            std::cout << "DEBUG calculation ::  " << actor->getPosition().z() - terrainHeight << std::endl;
-            if (actor->getPosition().z() - terrainHeight > 300.f)
-                actor->setOnGround(false);
-        }
-
         mActors.emplace(ptr, std::move(actor));
 
     }

apps/openmw/mwworld/scene.cpp

@@ -447,11 +447,14 @@ namespace MWWorld
                     mPhysics->disableWater();
 
                 const auto player = MWBase::Environment::get().getWorld()->getPlayerPtr();
+                if (player.getCell() == cell) {
+                    mPhysics->traceDown(player, player.getRefData().getPosition().asVec3(), 10.f);
+                }
+
                 navigator->update(player.getRefData().getPosition().asVec3());
 
                 if (!cell->isExterior() && !(cell->getCell()->mData.mFlags & ESM::Cell::QuasiEx))
                 {
-
                     mRendering.configureAmbient(cell->getCell());
                 }
             }