Added the Thorn Chakram.

src/main/java/vazkii/botania/client/core/proxy/ClientProxy.java

@@ -110,6 +110,7 @@ import vazkii.botania.common.core.version.VersionChecker;
 import vazkii.botania.common.entity.EntityDoppleganger;
 import vazkii.botania.common.entity.EntityPixie;
 import vazkii.botania.common.entity.EntitySpark;
+import vazkii.botania.common.entity.EntityThornChakram;
 import vazkii.botania.common.entity.EntityVineBall;
 import vazkii.botania.common.item.ModItems;
 import vazkii.botania.common.lib.LibObfuscation;
@@ -207,6 +208,7 @@ public class ClientProxy extends CommonProxy {
 		RenderingRegistry.registerEntityRenderingHandler(EntityVineBall.class, new RenderSnowball(ModItems.vineBall));
 		RenderingRegistry.registerEntityRenderingHandler(EntityDoppleganger.class, new RenderDoppleganger());
 		RenderingRegistry.registerEntityRenderingHandler(EntitySpark.class, new RenderSpark());
+		RenderingRegistry.registerEntityRenderingHandler(EntityThornChakram.class, new RenderSnowball(ModItems.thornChakram));
 
 		ShaderHelper.initShaders();
 	}

src/main/java/vazkii/botania/common/entity/EntitySpark.java

@@ -166,7 +166,8 @@ public class EntitySpark extends Entity implements ISparkEntity {
 					if(upgrade_ == 0 && spark.getAttachedTile() instanceof IManaPool)
 						validSparks.add(spark);
 				}
- 				validSparks.get(worldObj.rand.nextInt(validSparks.size())).registerTransfer(this);
+ 				if(validSparks.size() > 0)
+ 					validSparks.get(worldObj.rand.nextInt(validSparks.size())).registerTransfer(this);
  				
 				break;
 			}

src/main/java/vazkii/botania/common/entity/EntityThornChakram.java

@@ -0,0 +1,126 @@
+/**
+ * This class was created by <Vazkii>. It's distributed as
+ * part of the Botania Mod. Get the Source Code in github:
+ * https://github.com/Vazkii/Botania
+ * 
+ * Botania is Open Source and distributed under a
+ * Creative Commons Attribution-NonCommercial-ShareAlike 3.0 License
+ * (http://creativecommons.org/licenses/by-nc-sa/3.0/deed.en_GB)
+ * 
+ * File Created @ [Jan 25, 2015, 6:47:35 PM (GMT)]
+ */
+package vazkii.botania.common.entity;
+
+import net.minecraft.entity.EntityLivingBase;
+import net.minecraft.entity.item.EntityItem;
+import net.minecraft.entity.player.EntityPlayer;
+import net.minecraft.entity.projectile.EntityThrowable;
+import net.minecraft.item.ItemStack;
+import net.minecraft.util.DamageSource;
+import net.minecraft.util.MovingObjectPosition;
+import net.minecraft.world.World;
+import net.minecraftforge.common.util.ForgeDirection;
+import vazkii.botania.common.core.helper.MathHelper;
+import vazkii.botania.common.core.helper.Vector3;
+import vazkii.botania.common.item.ModItems;
+
+public class EntityThornChakram extends EntityThrowable {
+
+	private static final int MAX_BOUNCES = 8;
+	boolean bounced = false;
+	
+	public EntityThornChakram(World world) {
+		super(world);
+	}
+	
+    public EntityThornChakram(World world, EntityLivingBase e) {
+    	super(world, e);
+    }
+    
+	@Override
+	protected void entityInit() {
+		dataWatcher.addObject(30, 0);
+		dataWatcher.setObjectWatched(30);
+	}
+
+    @Override
+    public void onUpdate() {
+    	double mx = motionX;
+    	double my = motionY;
+    	double mz = motionZ;
+    	
+    	super.onUpdate();
+    	int bounces = getTimesBounced();
+    	if(bounces >= MAX_BOUNCES || ticksExisted > 60) {
+    		EntityLivingBase thrower = getThrower();
+    		noClip = true;
+    		if(thrower == null)
+    			dropAndKill();
+    		else {
+    			Vector3 motion = Vector3.fromEntityCenter(thrower).sub(Vector3.fromEntityCenter(this)).normalize();
+    			motionX = motion.x;
+    			motionY = motion.y;
+    			motionZ = motion.z;
+    			if(MathHelper.pointDistanceSpace(posX, posY, posZ, thrower.posX, thrower.posY, thrower.posZ) < 1)
+    				if(!(thrower instanceof EntityPlayer && (((EntityPlayer) thrower).capabilities.isCreativeMode || ((EntityPlayer) thrower).inventory.addItemStackToInventory(new ItemStack(ModItems.thornChakram)))))
+    					dropAndKill();
+    				else if(!worldObj.isRemote)
+    					setDead();
+    		}
+    	} else {
+    		if(!bounced) {
+    			motionX = mx;
+    			motionY = my;
+    			motionZ = mz;
+    		}
+    		bounced = false;
+    	}
+    }
+    
+    private void dropAndKill() {
+    	if(!worldObj.isRemote) {
+			ItemStack stack = new ItemStack(ModItems.thornChakram);
+			EntityItem item = new EntityItem(worldObj, posX, posY, posZ, stack);
+			worldObj.spawnEntityInWorld(item);
+			setDead();
+    	}
+    }
+    
+	@Override
+	protected void onImpact(MovingObjectPosition pos) {
+		if(noClip)
+			return;
+		
+		EntityLivingBase thrower = getThrower();
+		if(pos.entityHit != null && pos.entityHit instanceof EntityLivingBase && pos.entityHit != thrower)
+			((EntityLivingBase) pos.entityHit).attackEntityFrom(thrower != null ? thrower instanceof EntityPlayer ? DamageSource.causePlayerDamage((EntityPlayer) thrower) : DamageSource.causeMobDamage(thrower) : DamageSource.generic, 6);
+		else {
+			int bounces = getTimesBounced();
+			if(bounces < MAX_BOUNCES) {
+				Vector3 currentMovementVec = new Vector3(motionX, motionY, motionZ);
+				ForgeDirection dir = ForgeDirection.getOrientation(pos.sideHit);
+				Vector3 normalVector = new Vector3(dir.offsetX, dir.offsetY, dir.offsetZ).normalize();
+				Vector3 movementVec = normalVector.multiply(-2 * currentMovementVec.dotProduct(normalVector)).add(currentMovementVec);
+
+				motionX = movementVec.x;
+				motionY = movementVec.y;
+				motionZ = movementVec.z;
+				bounced = true;
+			}
+		}
+	}
+	
+	@Override
+	protected float getGravityVelocity() {
+		return 0F;
+	}
+	
+	int getTimesBounced() {
+		return dataWatcher.getWatchableObjectInt(30);
+	}
+	
+	void setTimesBounced(int times) {
+		dataWatcher.updateObject(30, times);
+	}
+
+}

src/main/java/vazkii/botania/common/entity/ModEntities.java

@@ -30,6 +30,7 @@ public final class ModEntities {
 		EntityRegistry.registerModEntity(EntitySpark.class, LibEntityNames.SPARK, id++, Botania.instance, 64, 10, false);
 		EntityRegistry.registerModEntity(EntityThrownItem.class, LibEntityNames.THROWN_ITEM, id++, Botania.instance, 64, 20, true);
 		EntityRegistry.registerModEntity(EntityMagicMissile.class, LibEntityNames.MAGIC_MISSILE, id++, Botania.instance, 64, 10, true);
+		EntityRegistry.registerModEntity(EntityThornChakram.class, LibEntityNames.THORN_CHAKRAM, id++, Botania.instance, 64, 10, true);
 	}
 
 }

src/main/java/vazkii/botania/common/item/ItemThornChakram.java

@@ -0,0 +1,38 @@
+/**
+ * This class was created by <Vazkii>. It's distributed as
+ * part of the Botania Mod. Get the Source Code in github:
+ * https://github.com/Vazkii/Botania
+ * 
+ * Botania is Open Source and distributed under a
+ * Creative Commons Attribution-NonCommercial-ShareAlike 3.0 License
+ * (http://creativecommons.org/licenses/by-nc-sa/3.0/deed.en_GB)
+ * 
+ * File Created @ [Jan 25, 2015, 6:42:47 PM (GMT)]
+ */
+package vazkii.botania.common.item;
+import net.minecraft.entity.player.EntityPlayer;
+import net.minecraft.item.ItemStack;
+import net.minecraft.world.World;
+import vazkii.botania.common.entity.EntityThornChakram;
+import vazkii.botania.common.lib.LibItemNames;
+
+public class ItemThornChakram extends ItemMod {
+
+	public ItemThornChakram() {
+		setUnlocalizedName(LibItemNames.THORN_CHAKRAM);
+		setMaxStackSize(1);
+	}
+
+	@Override
+	public ItemStack onItemRightClick(ItemStack p_77659_1_, World p_77659_2_, EntityPlayer p_77659_3_)  {
+		--p_77659_1_.stackSize;
+
+		p_77659_2_.playSoundAtEntity(p_77659_3_, "random.bow", 0.5F, 0.4F / (itemRand.nextFloat() * 0.4F + 0.8F));
+
+		if(!p_77659_2_.isRemote)
+			p_77659_2_.spawnEntityInWorld(new EntityThornChakram(p_77659_2_, p_77659_3_));
+
+		return p_77659_1_;
+	}
+
+}

src/main/java/vazkii/botania/common/item/ModItems.java

@@ -198,6 +198,7 @@ public final class ModItems {
 	public static Item smeltRod;
 	public static Item worldSeed;
 	public static Item spellCloth;
+	public static Item thornChakram;
 
 	public static void init() {
 		lexicon = new ItemLexicon();
@@ -303,6 +304,7 @@ public final class ModItems {
 		smeltRod = new ItemSmeltRod();
 		worldSeed = new ItemWorldSeed();
 		spellCloth = new ItemSpellCloth();
+		thornChakram = new ItemThornChakram();
 		
 		OreDictionary.registerOre(LibOreDict.LEXICON, lexicon);
 		for(int i = 0; i < 16; i++) {

src/main/java/vazkii/botania/common/lib/LibEntityNames.java

@@ -25,5 +25,6 @@ public final class LibEntityNames {
 	public static final String SPARK = LibResources.PREFIX_MOD + "spark";
 	public static final String THROWN_ITEM = LibResources.PREFIX_MOD + "thrownItem";
 	public static final String MAGIC_MISSILE = LibResources.PREFIX_MOD + "magicMissile";
+	public static final String THORN_CHAKRAM = LibResources.PREFIX_MOD + "thornChakram";
 
 }

src/main/java/vazkii/botania/common/lib/LibItemNames.java

@@ -117,6 +117,7 @@ public final class LibItemNames {
 	public static final String SMELT_ROD = "smeltRod";
 	public static final String WORLD_SEED = "worldSeed";
 	public static final String SPELL_CLOTH = "spellCloth";
+	public static final String THORN_CHAKRAM = "thornChakram";
 
 	public static final String[] LENS_NAMES = new String[] {
 		"lensNormal",