add Transform.dirty flag

res/content/base/scripts/components/drop.lua

@@ -22,7 +22,8 @@ end
 
 function on_update()
     if inair then
-        tsf:set_rot(mat4.rotate(tsf:get_rot(), {0, 1, 0}, math.random()*4))
-        tsf:set_rot(mat4.rotate(tsf:get_rot(), {0, 0, 1}, math.random()*4))
+        local dt = time.delta();
+        tsf:set_rot(mat4.rotate(tsf:get_rot(), {0, 1, 0}, 240*dt))
+        tsf:set_rot(mat4.rotate(tsf:get_rot(), {0, 0, 1}, 240*dt))
     end
 end

res/content/base/scripts/hud.lua

@@ -9,9 +9,9 @@ function on_hud_open()
         local ppos = vec3.add({player.get_pos(pid)}, {0, 0.7, 0})
         local throw_force = vec3.mul(vec3.add(player.get_dir(pid), 
         {
-            (math.random() - 0.5) * 5,
-            (math.random() - 0.5) * 5,
-            (math.random() - 0.5) * 5
+            (math.random() - 0.5) * 1,
+            (math.random() - 0.5) * 1,
+            (math.random() - 0.5) * 1
         }), DROP_FORCE)
 
         local drop = entity.spawn("base:drop", ppos)

src/logic/scripting/lua/libentity.cpp

@@ -51,7 +51,7 @@ static int l_get_pos(lua::State* L) {
 
 static int l_set_pos(lua::State* L) {
     if (auto entity = get_entity(L, 1)) {
-        entity->getTransform().pos = lua::tovec3(L, 2);
+        entity->getTransform().setPos(lua::tovec3(L, 2));
     }
     return 0;
 }
@@ -79,7 +79,7 @@ static int l_get_rot(lua::State* L) {
 
 static int l_set_rot(lua::State* L) {
     if (auto entity = get_entity(L, 1)) {
-        entity->getTransform().rot = lua::tomat4(L, 2);
+        entity->getTransform().setRot(lua::tomat4(L, 2));
     }
     return 0;
 }

src/objects/Entities.cpp

@@ -18,6 +18,7 @@ void Transform::refresh() {
     combined = glm::translate(combined, pos);
     combined = glm::scale(combined, size);
     combined = combined * glm::mat4(rot);
+    dirty = false;
 }
 
 void Entity::destroy() {
@@ -136,7 +137,7 @@ void Entities::updatePhysics(float delta) {
             eid.uid
         );
         hitbox.linearDamping = hitbox.grounded * 24;
-        transform.pos = hitbox.position;
+        transform.setPos(hitbox.position);
         if (hitbox.grounded && !grounded) {
             scripting::on_entity_grounded(*get(eid.uid), glm::length(prevVel-hitbox.velocity));
         }
@@ -150,8 +151,10 @@ void Entities::update() {
     scripting::on_entities_update();
     auto view = registry.view<Transform>();
     for (auto [entity, transform] : view.each()) {
+        if (transform.dirty) {
             transform.refresh();
         }
+    }
 }
 
 void Entities::renderDebug(LineBatch& batch, const Frustum& frustum) {

src/objects/Entities.hpp

@@ -7,6 +7,8 @@
 #include <vector>
 #include <optional>
 #include <glm/glm.hpp>
+#define GLM_ENABLE_EXPERIMENTAL
+#include <glm/gtx/norm.hpp>
 #include <unordered_map>
 #include <entt/entity/registry.hpp>
 
@@ -32,8 +34,21 @@ struct Transform {
     glm::vec3 size;
     glm::mat3 rot;
     glm::mat4 combined;
+    bool dirty = true;
 
     void refresh();
+    
+    inline void setRot(glm::mat3 m) {
+        rot = m;
+        dirty = true;
+    }
+
+    inline void setPos(glm::vec3 v) {
+        if (glm::distance2(pos, v) >= 0.00001f) {
+            dirty = true;
+        }
+        pos = v;
+    }
 };
 
 struct Rigidbody {