diff --git a/src/components/InteractiveObjects/CharacterObject.vue b/src/components/InteractiveObjects/CharacterObject.vue
index 17f7ee2..22df998 100644
--- a/src/components/InteractiveObjects/CharacterObject.vue
+++ b/src/components/InteractiveObjects/CharacterObject.vue
@@ -28,6 +28,7 @@ export default {
         assignCharacter(e){
             this.modelValue.go = e.id;
             this.modelValue.title = e.name
+            this.modelValue.exclude = true
         }
     }
 }
diff --git a/src/components/InteractiveObjects/GenenricObject.js b/src/components/InteractiveObjects/GenenricObject.js
index 719caac..e059fc6 100644
--- a/src/components/InteractiveObjects/GenenricObject.js
+++ b/src/components/InteractiveObjects/GenenricObject.js
@@ -1,5 +1,5 @@
 import { getBoundingBox, getBoundingBoxCenterPoint, getBoundingBoxMaxLength, centerOrigin } from "@/lib/MeshUtils";
-import { EventDispatcher } from "three";
+import { EventDispatcher, SphereGeometry, Mesh, MeshStandardMaterial, BackSide } from "three";
 
 class GenericObject extends EventDispatcher{
     constructor(engine, data){
@@ -9,6 +9,20 @@ class GenericObject extends EventDispatcher{
             this.object = centerOrigin(this.source.scene)
 
             if (!data.exclude){
+                const bckGeometry = new SphereGeometry(getBoundingBoxMaxLength(this.object.userData.bbox)/2,8,8)
+                const bckMesh = new Mesh(bckGeometry, new MeshStandardMaterial({
+                    transparent: true,
+                    opacity:1, color: 0xaaaaaa,
+                    alphaMap: await engine.loadTexture('locked.webp', '/static/textures/'),
+                }))
+                this.object.add(bckMesh)
+                engine.motionQueue.add(
+                    { o: bckMesh, a:{ 
+                        material: { opacity: k=>0.11 + 0.52*Math.sin(k*Math.PI)},
+                        rotation: { y: k=>k*Math.PI*2},
+                        scale: (k,s)=>s.setScalar(1+0.11*Math.sin(2*k*Math.PI))
+                    }, r: true, t: 3 },
+                )
                 engine.clickable.add(this.object, async e=>{
                     this.object._active = !this.object._active;
                     if (engine.dashboard){
diff --git a/src/components/InteractiveObjects/Particles.vue b/src/components/InteractiveObjects/Particles.vue
index 3112fd5..8286cdd 100644
--- a/src/components/InteractiveObjects/Particles.vue
+++ b/src/components/InteractiveObjects/Particles.vue
@@ -1,18 +1,16 @@
 <template>
-    <v-card v-if="modelValue.go">
-        <v-card-item>
-            <v-number-input density="compact" :precision="null" label="Particle width" v-model="modelValue.x"></v-number-input>
-            <v-number-input density="compact" :precision="null" label="Particle height" v-model="modelValue.y"></v-number-input>
+    <div v-if="modelValue.go">
+        <v-number-input density="compact" :precision="null" label="Particle width" v-model="modelValue.x"></v-number-input>
+        <v-number-input density="compact" :precision="null" label="Particle height" v-model="modelValue.y"></v-number-input>
 
-            <v-number-input density="compact" :precision="null" label="Area width" v-model="modelValue.w"></v-number-input>
-            <v-number-input density="compact" :precision="null" label="Area length" v-model="modelValue.h"></v-number-input>
+        <v-number-input density="compact" :precision="null" label="Area width" v-model="modelValue.w"></v-number-input>
+        <v-number-input density="compact" :precision="null" label="Area length" v-model="modelValue.h"></v-number-input>
 
-            <v-number-input density="compact" label="Count" v-model="modelValue.count"></v-number-input>
+        <v-number-input density="compact" label="Count" v-model="modelValue.count"></v-number-input>
 
-            <v-img :src="`/asset/thumb/${modelValue.go}.webp`" />
-            <div class="text-caption text-center">{{ modelValue.title }}</div>
-        </v-card-item>
-    </v-card>
+        <v-img :src="`/asset/thumb/${modelValue.go}.webp`" />
+        <div class="text-caption text-center">{{ modelValue.title }}</div>
+    </div>
     <asset-selector @select="assignTexture" :type="['Texture']">
         <template v-slot:activator="props">
             <v-btn v-bind="props" prepend-icon="mdi-video-box" color="deep-orange-darken-4" block>Choose image object</v-btn>
@@ -43,6 +41,7 @@ export default {
             this.modelValue.count = 1000;
             this.modelValue.w = 50;
             this.modelValue.h = 50;
+            this.modelValue.exclude = true;
         }
     }
 }
diff --git a/src/components/SceneDesigner/GameObject.vue b/src/components/SceneDesigner/GameObject.vue
index 6467588..983195b 100644
--- a/src/components/SceneDesigner/GameObject.vue
+++ b/src/components/SceneDesigner/GameObject.vue
@@ -1,4 +1,10 @@
 <template>
+    <teleport to=".scene-designer .lines" v-if="active">
+        <OffsetLine v-for="(t, i) in modelValue.activationTriggers" :x1="vd.x1" :y1="vd.y1" 
+            :x2="parent.data.items.find(i=>i.data.id == t)?.vd.x1"
+            :y2="parent.data.items.find(i=>i.data.id == t)?.vd.y1" :o1="52" :o2="52"
+            class="trigger" marker-start="url(#arrow)" ></OffsetLine>
+    </teleport>
     <teleport to=".scene-designer .game-objects" v-if="active">
         <g @mousedown="$emit('target', {target:vd, attrs:['x1', 'y1'], delta: true})" :class="{gameObject: true, selected}" 
             v-show="showInView">
@@ -18,14 +24,21 @@
         </asset-selector>
         <v-form class="pt-4">
             <v-text-field density="compact" :label="l.name" v-model="modelValue.title"></v-text-field>
-            <v-text-field density="compact" :label="l.id" v-model="modelValue.id"></v-text-field>
+            <!-- <v-text-field density="compact" :label="l.id" v-model="modelValue.id"></v-text-field> -->
             <v-number-input density="compact" label="Completion points" v-model="modelValue.points"></v-number-input>
         </v-form>
+        <v-container v-if="selected && modelValue.type">
+            <component :is="modelValue.type" v-model="mv"></component>
+        </v-container>
+
+        <v-card title="Activation requirements" v-if="modelValue.type != 'CharacterObject'">
+            <v-number-input density="compact" label="Level score should be above" v-model="modelValue.activationScore"></v-number-input>
+            <v-select density="compact" label="Following elements should be completed"  v-model="modelValue.activationTriggers"
+                :items="parent.data.items.filter(v=>!v.data.exclude && v.data!==modelValue).map(v=>({title: v.data.title, value: v.data.id}))" multiple ></v-select>
+        </v-card>
     </v-card>
     
-    <v-container v-if="selected && modelValue.type">
-        <component :is="modelValue.type" v-model="mv"></component>
-    </v-container>
+    
 </template>
 
 <script>
@@ -39,10 +52,11 @@ import MazeQuizGame from '../InteractiveObjects/MazeQuizGame/MazeQuizGame.vue';
 import Particles from '../InteractiveObjects/Particles.vue';
 import GenericObject from '../InteractiveObjects/GenericObject.vue';
 import CharacterObject from '../InteractiveObjects/CharacterObject.vue';
+import OffsetLine from './OffsetLine.vue';
 
 export default {
   emits:['target', 'preview'],
-  components: { SvgIcon, GenericObject, CharacterObject, VideoPlayer, PuzzleGame1, PuzzleGame2, MazeQuizGame, Particles, },
+  components: { SvgIcon, OffsetLine, GenericObject, CharacterObject, VideoPlayer, PuzzleGame1, PuzzleGame2, MazeQuizGame, Particles, },
     data(){
         return {
             active: false
@@ -51,6 +65,7 @@ export default {
     mounted(){
         this.active = true;
         this.modelValue.points ??= 10;
+        this.modelValue.activationScore ??= 0;
     },
     props:{
         //context: Object,
diff --git a/src/components/SceneDesigner/OffsetLine.vue b/src/components/SceneDesigner/OffsetLine.vue
new file mode 100644
index 0000000..fb302b6
--- /dev/null
+++ b/src/components/SceneDesigner/OffsetLine.vue
@@ -0,0 +1,35 @@
+<template>
+    <line :x1="ox1" :y1="oy1" :x2="ox2" :y2="oy2"></line>
+</template>
+
+<script>
+export default {
+    props:{
+        x1: Number, y1: Number, x2: Number, y2: Number,
+        o1: Number, o2: Number
+    },
+    data(){
+        return {
+            ox1:0, ox2:0, oy1:0, oy2:0
+        }
+    },
+    mounted(){
+        this.calc();
+        this.$watch(
+            (vm) => (vm.x1, vm.y1, vm.x2, vm.y2, vm.o1, vm.o2, Date.now()),
+            this.calc
+        )
+    },
+    methods:{
+        calc: function(){
+            let dx = this.x2 - this.x1, dy = this.y2 - this.y1;
+            let a = Math.atan2(dy, dx);
+            let h = Math.sqrt(dx*dx + dy*dy);
+            this.ox1 = this.x1 + this.o1 * Math.cos(a);
+            this.oy1 = this.y1 + this.o1 * Math.sin(a);
+            this.ox2 = this.x1 + (h-this.o1) * Math.cos(a);
+            this.oy2 = this.y1 + (h-this.o1) * Math.sin(a);
+        }
+    }
+}
+</script>
\ No newline at end of file
diff --git a/src/components/SceneDesigner/SceneDesigner.vue b/src/components/SceneDesigner/SceneDesigner.vue
index 576aa11..cd21ef8 100644
--- a/src/components/SceneDesigner/SceneDesigner.vue
+++ b/src/components/SceneDesigner/SceneDesigner.vue
@@ -19,7 +19,14 @@
             <svg class="scene-designer" @resize="resize" :width="viewBox.w" :height="viewBox.h"
                 :viewBox="`${vb.x} ${vb.y} ${vb.w} ${vb.h}`" x="0" y="0" xmlns="http://www.w3.org/2000/svg"
                 xmlns:xlink="http://www.w3.org/1999/xlink">
+                <defs>
+                    <marker id="arrow" viewBox="0 0 10 10" refX="5" refY="5"
+                        markerWidth="6" markerHeight="6" orient="auto-start-reverse">
+                        <path d="M 0 0 L 10 5 L 0 10 z" />
+                    </marker>
+                </defs>
                 <SvgRectangle v-model="selector" class="selector"></SvgRectangle>
+                <g class="lines"></g>
                 <g class="tasks"></g>
                 <g class="game-objects"></g>
                 <g class="scenes"></g>
diff --git a/src/lib/MeshUtils.js b/src/lib/MeshUtils.js
index 0475e90..47cde5e 100644
--- a/src/lib/MeshUtils.js
+++ b/src/lib/MeshUtils.js
@@ -57,8 +57,8 @@ function autoScale(object, mk = 1) {
 
 function centerOrigin(object){
     let result = new Group();
-    let bb = getBoundingBox(object);
-    let position = getBoundingBoxCenterPoint(bb, object.position).negate();
+    result.userData.bbox = getBoundingBox(object);
+    let position = getBoundingBoxCenterPoint(result.userData.bbox, object.position).negate();
     object.position.copy(position)
     result.add(object);
     return result;
diff --git a/src/lib/MotionEngine.js b/src/lib/MotionEngine.js
index 1416633..4990f2e 100644
--- a/src/lib/MotionEngine.js
+++ b/src/lib/MotionEngine.js
@@ -18,7 +18,10 @@ class MotionEngine {
                 if (mode == 'offset') {
                     target[key] = (initial[key] || 0) + value * k;
                 } else if (typeof (value) == 'function') {
-                    target[key] = value(k);
+                    let v = value(k, target[key]);
+                    if (target[key] !== v){
+                        target[key] = v;
+                    }
                 } else {
                     target[key] = (initial[key] || 0) + (value - (initial[key] || 0)) * k;
                 }
diff --git a/src/styles/style.scss b/src/styles/style.scss
index edb24fa..cc343e6 100644
--- a/src/styles/style.scss
+++ b/src/styles/style.scss
@@ -77,6 +77,10 @@ video{
             stroke: rgb(213, 226, 231);
             stroke-width: calc( 2px * var(--svg-scale) );
         }
+        line.trigger, marker#arrow path {
+            stroke: rgb(244, 215, 230);
+            fill: rgb(172, 105, 139);
+        }
         g.selector {
             line {
             stroke-dasharray: 0 calc(8 * var(--svg-scale)) 0;