Added some simple and very inefficient ship exhaust.

...sometimes it is better to look good than to feel good.

Author: pspeed42

sigem/assets/Textures/neon-puff256.png

@@ -44,5 +44,7 @@
  */
 public interface ControlDriver {
 
+    public void initialize( Body body );
+
     public void update( double stepTime, Body body );
 }

sigem/src/main/java/sigem/sim/ControlDriver.java

@@ -53,6 +53,8 @@ public class ShipDriver implements ControlDriver {
 
     static Logger log = LoggerFactory.getLogger(ShipDriver.class);
 
+    private Body body;
+ 
     // Keep track of what the player has provided.
     private volatile Vec3d thrust = new Vec3d();
 
@@ -62,9 +64,25 @@ public class ShipDriver implements ControlDriver {
     private float maxSpeed = 10;
     private float turnSpeed = 1;   
     private double lateralBraking = 0.9;
+    
+    public ShipDriver() {
+    }
+ 
+    public Body getBody() {
+        return body;
+    }
+ 
+    public Vec3d getThrust() {
+        return thrust;
+    }
 
     public void applyControlInput( ShipInput input ) {
         this.thrust = input.getThrust();
+    }
+    
+    @Override
+    public void initialize( Body body ) {
+        this.body = body;
     } 
 
     @Override

sigem/src/main/java/sigem/sim/ShipDriver.java

@@ -41,6 +41,8 @@
 import org.slf4j.*;
 
 import com.simsilica.es.*;
+import com.simsilica.es.common.Decay;
+import com.simsilica.mathd.*;
 import com.simsilica.sim.*;
 
 import sigem.es.*;
@@ -59,6 +61,9 @@ public class ShipInputSystem extends AbstractGameSystem {
     private SimplePhysics phys;
 
     private ShipContainer ships;
+    
+    private double nextPuff = 0;
+    private double puffInterval = 0.05; //0.2; 
 
     public ShipInputSystem() {
     }
@@ -93,13 +98,40 @@ public void stop() {
 
     @Override
     public void update( SimTime time ) {
-        ships.update(); 
+        ships.update();
+        
+        // Could have done this with a separate system but
+        // it was convenient to do it here.
+        double t = time.getTimeInSeconds(); 
+        if( t > nextPuff ) {
+            nextPuff = t + puffInterval;
+            
+            for( ShipDriver ship : ships.getArray() ) {
+                if( ship.getThrust().z == 0 ) {
+                    continue;
+                }
+                // Else the thrusters are on and we can puff
+                Body body = ship.getBody();
+                // Make it appear 2 units behind the ship
+                Vec3d loc = body.pos.subtract(body.orientation.mult(Vec3d.UNIT_Z.mult(2)));
+                EntityId puff = ed.createEntity();
+                ed.setComponents(puff,
+                    new Position(loc),
+                    ObjectType.create("thrust", ed),
+                    new Decay(time.getTime(), time.getFutureTime(5.0))
+                    );
+            } 
+        } 
     }
 
     private class ShipContainer extends EntityContainer<ShipDriver> {
         public ShipContainer( EntityData ed ) {
             super(ed, ShipInput.class);
         }
+        
+        public ShipDriver[] getArray() {
+            return super.getArray();
+        }
 
         @Override       
         protected ShipDriver addObject( Entity e ) {

sigem/src/main/java/sigem/sim/ShipInputSystem.java

@@ -96,6 +96,7 @@ public void setControlDriver( EntityId entityId, ControlDriver driver ) {
             Body current = getBody(entityId);
             if( current != null ) {
                 current.driver = driver;
+                driver.initialize(current);
             }
         }
     }
@@ -118,6 +119,9 @@ protected Body createBody( EntityId entityId, double invMass, double radius, boo
 
                 // Hookup the driver if it has one waiting
                 result.driver = driverIndex.get(entityId);
+                if( result.driver != null ) {
+                    result.driver.initialize(result);
+                }
 
                 // Give it any initial impulse that it might have
                 Impulse imp = ed.getComponent(entityId, Impulse.class);

sigem/src/main/java/sigem/sim/SimplePhysics.java

@@ -58,6 +58,7 @@
 
 import com.simsilica.es.*;
 import com.simsilica.lemur.*;
+import com.simsilica.lemur.anim.*;
 import com.simsilica.lemur.style.ElementId;
 import com.simsilica.mathd.*;
 import com.simsilica.state.*;
@@ -75,6 +76,7 @@ public class ModelViewState extends BaseAppState {
     static Logger log = LoggerFactory.getLogger(ModelViewState.class);
 
     private EntityData ed;
+    private AssetManager assets;
 
     private Node modelRoot;
 
@@ -103,6 +105,7 @@ public Spatial getModel( EntityId id ) {
     @Override
     protected void initialize( Application app ) {
         modelRoot = new Node();
+        assets = app.getAssetManager();
 
         this.ed = getState(GameSystemsState.class).get(EntityData.class);
     }
@@ -159,11 +162,9 @@ public void update( float tpf ) {
 
     protected Spatial createShip( Entity entity ) {
 
-        AssetManager assetManager = getApplication().getAssetManager();
-        
-        Spatial ship = assetManager.loadModel("Models/fighter.j3o");
+        Spatial ship = assets.loadModel("Models/fighter.j3o");
         ship.center();
-        Texture texture = assetManager.loadTexture("Textures/ship1.png");
+        Texture texture = assets.loadTexture("Textures/ship1.png");
         Material mat = GuiGlobals.getInstance().createMaterial(texture, false).getMaterial();
         mat.setTexture("ColorMap", texture);
         ship.setMaterial(mat);
@@ -219,13 +220,11 @@ protected Spatial createPlanet( Entity entity ) {
 
     protected Spatial createAsteroid( Entity entity ) {
 
-        AssetManager assetManager = getApplication().getAssetManager();
-        
-        Spatial rock = assetManager.loadModel("Models/Rock1/Rock1.j3o");
+        Spatial rock = assets.loadModel("Models/Rock1/Rock1.j3o");
         rock.setName("rock");
         //rock.setLocalScale(50);
         rock.center();
-        Texture texture = assetManager.loadTexture("Models/Rock1/textures/Rock02LV3_1_1024.jpg");
+        Texture texture = assets.loadTexture("Models/Rock1/textures/Rock02LV3_1_1024.jpg");
         Material mat = GuiGlobals.getInstance().createMaterial(texture, false).getMaterial();
         //mat.setTexture("ColorMap", texture);
         rock.setMaterial(mat);
@@ -254,6 +253,36 @@ protected Spatial createAsteroid( Entity entity ) {
 
         return result;
     }
+    
+    protected Spatial createThrust( Entity entity ) {
+ 
+        GuiGlobals globals = GuiGlobals.getInstance(); 
+    
+        Node result = new Node("thrust");
+    
+        Quad quad = new Quad(2, 2);
+        Geometry geom = new Geometry("quad", quad);
+        Texture texture = globals.loadTexture("Textures/neon-puff256.png", false, false);
+        //Material mat = globals.createMaterial(ColorRGBA.Blue, false).getMaterial();
+        Material mat = globals.createMaterial(texture, false).getMaterial();
+        mat.getAdditionalRenderState().setBlendMode(BlendMode.AlphaAdditive);
+        geom.setQueueBucket(Bucket.Transparent);
+        geom.rotate(-FastMath.HALF_PI, 0, 0);
+        geom.setMaterial(mat);
+        geom.center();
+        geom.move(0, -1, 0);
+        
+        ColorRGBA color = new ColorRGBA(2, 2, 0, 1);
+        mat.setColor("Color", color);
+        
+        // Fade it out over five seconds.  We could have created a system to do
+        // this based on decay, blah blah... but this is really easy.
+        getState(AnimationState.class).add(new ColorTween(color, ColorRGBA.White, new ColorRGBA(1, 1, 1, 0), 5));
+        
+        result.attachChild(geom);
+        
+        return result;   
+    }
 
     protected Spatial createModel( Entity entity ) {
         // Check to see if one already exists
@@ -271,6 +300,8 @@ protected Spatial createModel( Entity entity ) {
             result = createPlanet(entity);
         } else if( typeName.equals("asteroid") ) {
             result = createAsteroid(entity);
+        } else if( typeName.equals("thrust") ) {
+            result = createThrust(entity);        
         } else {
             throw new RuntimeException("Unknown spatial type:" + typeName); 
         }
@@ -336,7 +367,39 @@ protected void removeObject( Spatial object, Entity e ) {
                 log.trace("removeObject(" + e + ")");
             }        
             removeModel(object, e);
-        }                   
+        }
+    }
+    
+    /**
+     *  Lemur does not yet provide one of these so we will do it ourselves.
+     */
+    private class ColorTween extends AbstractTween {
+
+        private final ColorRGBA target;
+        private final ColorRGBA from;
+        private final ColorRGBA to;
+        private final ColorRGBA value;
+
+        public ColorTween( ColorRGBA target, ColorRGBA from, ColorRGBA to, double length ) {
+            super(length);
+            this.target = target;
+            this.from = from.clone();
+            this.to = to.clone();
+            this.value = new ColorRGBA(from);
+        }
+
+        @Override
+        protected void doInterpolate( double t ) {
+            // Interpolate
+            value.interpolateLocal(from, to, (float)t);
+            target.set(value);
+        }
+        
+        @Override
+        public String toString() {
+            return getClass().getSimpleName() + "[target=" + target + ", from=" + from + ", to=" + to + ", length=" + getLength() + "]";
+        }
     }
+
 }