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Hi, my scene is a metro station, there are many people sit or stand on the train(more than 200 people).there are only 15 kinds model, but each model have 3-5 suits cloth(material) .in fact, 3 pants with 3 jacket could mix to 9 suits. I want that every time I reload the world ,the model and their material would changed random. Now my way is create every possible suit to materials. it's a huge work.. does any one have good ideas? thanks! this is part of code Node peopie_n; //obstacle = new ObstacleSphere(0.3f); //random load station passenger void randloadhuman(){ int count=10; forloop(int i =0; count){ Node n = engine.editor.getNodeByName("Brith_" + string(i)); Brith_n.append(node_cast(n)); Vec3 p = Brith_n.getPosition(); Brith_pos.append(p); int passenger=rand(1,10); if(passenger==1){ peopie_n = node_load("metro/human/man/nodes/man_idle_basic.node"); }else if(passenger==2){ peopie_n = node_load("metro/human/boy/nodes/boy_idle_basic.node"); }else if(passenger==3){ peopie_n = node_load("metro/human/girl/nodes/girl_idle_basic.node"); }else if(passenger==4){ peopie_n = node_load("metro/human/man_handbag/nodes/man_handbag_idle_basic.node"); }else if(passenger==5){ peopie_n = node_load("metro/human/woman/nodes/woman_idle_basic.node"); }else if(passenger==6){ peopie_n = node_load("metro/human/woman_handbag/nodes/woman_handbag_idle_basic.node"); }else if(passenger==7){ peopie_n = node_load("metro/human/children/nodes/children_idle_basic.node"); }else if(passenger==8){ peopie_n = node_load("metro/human/grandma/nodes/grandma_idle_basic.node"); }else if(passenger==9){ peopie_n = node_load("metro/human/grandpa/nodes/grandpa_idle_basic.node"); } peopie_n.setPosition(Brith_pos); peopie_n.setRotation(peopie_n.getRotation() * quat(rotateZ(180))) ; //peopie_n.addChild(obstacle); //obstacle.setTransform(translate(Vec3(0,0,0))); humans.append(node_cast(peopie_n)); count--; //engine.editor.addNode(peopie_n); } }