Multi-tread support for tanks

core/src/mindustry/entities/comp/TankComp.java

@@ -32,9 +32,10 @@ abstract class TankComp implements Posc, Flyingc, Hitboxc, Unitc, ElevationMovec
         //dust
         if(walked && !headless){
             treadEffectTime += Time.delta;
-            if(treadEffectTime >= 6f){
+            if(treadEffectTime >= 6f && type.treadRects.length > 0){
                 var treadRegion = type.treadRegion;
-                var treadRect = type.treadRect;
+                //first rect should always be at the back
+                var treadRect = type.treadRects[0];
 
                 float xOffset = (treadRegion.width/2f - (treadRect.x + treadRect.width/2f)) / 4f;
                 float yOffset = (treadRegion.height/2f - (treadRect.y + treadRect.height/2f)) / 4f;

core/src/mindustry/entities/units/UnitDecal.java

@@ -9,6 +9,7 @@ public class UnitDecal{
     public float x, y, rotation;
     public float layer = Layer.flyingUnit + 1f;
     public float xScale = 1f, yScale = 1f;
+    public Blending blending = Blending.normal;
     public Color color = Color.white;
 
     public UnitDecal(String region, float x, float y, float rotation, float layer, Color color){