Rekkyn

Yeah, that's a weird thing in minecraft, all the instances of an item all point back to one instance of the item class. That means that any variables you have in the class will the same for all instances of the item. The way to have separate data for each item is to use NBT data. Here's a really good tutorial on how to use it: http://www.minecraftforum.net/topic/982336-tutorial-147-nbttagcompound-using-itemstacks-stacktagcompound-for-permanent-extra-data-storage/ Hopefully that helps!

Have you tried "mods/trunkS/mod/textures/items/woodParticle.png"? Also, are you using Eclipse?

Try putting super.onUpdate() in your update method, so that it runs the EntityThrowable update code, which contains the code to make it move.

Why hello there. I'm making a custom bow and arrow for my mod, and there is something wrong with the arrow. Server-side it works perfectly as intended, but on the client the arrow does not appear where it's supposed to be. For example, it veers off sometimes when you shoot it and it sometimes moves back to the position it was in when it was shot. Here's the entity registry in my main class: int entityID = EntityRegistry.findGlobalUniqueEntityId(); EntityRegistry.registerGlobalEntityID(EntityCrossbowBolt.class, "EntityCrossbowBolt", entityID); EntityRegistry.registerModEntity(EntityCrossbowBolt.class, "EntityCrossbowBolt", entityID, Spacetime.instance, 128, 1, false); LanguageRegistry.instance().addStringLocalization("entity.EntityCrossbowBolt.name", "Crossbow Bolt"); And here's the arrow entity class: package rekkyn.spacetime.entity; import java.util.List; import net.minecraft.block.Block; import net.minecraft.enchantment.EnchantmentThorns; import net.minecraft.entity.Entity; import net.minecraft.entity.EntityLiving; import net.minecraft.entity.IProjectile; import net.minecraft.entity.monster.EntityEnderman; import net.minecraft.entity.player.EntityPlayer; import net.minecraft.entity.player.EntityPlayerMP; import net.minecraft.entity.projectile.EntityArrow; import net.minecraft.nbt.NBTTagCompound; import net.minecraft.network.packet.Packet70GameEvent; import net.minecraft.util.AxisAlignedBB; import net.minecraft.util.DamageSource; import net.minecraft.util.MathHelper; import net.minecraft.util.MovingObjectPosition; import net.minecraft.util.Vec3; import net.minecraft.world.World; import rekkyn.spacetime.particles.ParticleEffects; import cpw.mods.fml.common.registry.IThrowableEntity; import cpw.mods.fml.relauncher.Side; import cpw.mods.fml.relauncher.SideOnly; public class EntityCrossbowBolt extends Entity/*Arrow*/ implements IProjectile, IThrowableEntity { private int xTile = -1; private int yTile = -1; private int zTile = -1; private int inTile = 0; private int inData = 0; private boolean inGround = false; /** Seems to be some sort of timer for animating an arrow. */ public int arrowShake = 0; /** The owner of this arrow. */ public Entity shootingEntity; private int ticksInGround; private int ticksInAir = 0; private double damage = 2.0D; /** The amount of knockback an arrow applies when it hits a mob. */ private int knockbackStrength; public EntityCrossbowBolt(World par1World) { super(par1World); renderDistanceWeight = 10.0D; this.setSize(0.5F, 0.5F); } public EntityCrossbowBolt(World world, double posX, double posY, double posZ) { super(world); renderDistanceWeight = 10.0D; this.setSize(0.5F, 0.5F); this.setPosition(posX, posY, posZ); yOffset = 0.0F; } public EntityCrossbowBolt(World world, EntityLiving shootingEntity, EntityLiving par3EntityLiving, float power, float par5) { super(world); renderDistanceWeight = 10.0D; this.shootingEntity = shootingEntity; posY = shootingEntity.posY + shootingEntity.getEyeHeight() - 0.10000000149011612D; double d0 = par3EntityLiving.posX - shootingEntity.posX; double d1 = par3EntityLiving.boundingBox.minY + par3EntityLiving.height / 3.0F - posY; double d2 = par3EntityLiving.posZ - shootingEntity.posZ; double d3 = MathHelper.sqrt_double(d0 * d0 + d2 * d2); if (d3 >= 1.0E-7D) { float f2 = (float) (Math.atan2(d2, d0) * 180.0D / Math.PI) - 90.0F; float f3 = (float) -(Math.atan2(d1, d3) * 180.0D / Math.PI); double d4 = d0 / d3; double d5 = d2 / d3; this.setLocationAndAngles(shootingEntity.posX + d4, posY, shootingEntity.posZ + d5, f2, f3); yOffset = 0.0F; float f4 = (float) d3 * 0.2F; this.setThrowableHeading(d0, d1 + f4, d2, power, par5); } } public EntityCrossbowBolt(World world, EntityLiving shootingEntity, float power) { super(world); renderDistanceWeight = 10.0D; this.shootingEntity = shootingEntity; this.setSize(0.5F, 0.5F); this.setLocationAndAngles(shootingEntity.posX, shootingEntity.posY + shootingEntity.getEyeHeight(), shootingEntity.posZ, shootingEntity.rotationYaw, shootingEntity.rotationPitch); posX -= MathHelper.cos(rotationYaw / 180.0F * (float) Math.PI) * 0.16F; posY -= 0.10000000149011612D; posZ -= MathHelper.sin(rotationYaw / 180.0F * (float) Math.PI) * 0.16F; this.setPosition(posX, posY, posZ); yOffset = 0.0F; motionX = -MathHelper.sin(rotationYaw / 180.0F * (float) Math.PI) * MathHelper.cos(rotationPitch / 180.0F * (float) Math.PI); motionZ = MathHelper.cos(rotationYaw / 180.0F * (float) Math.PI) * MathHelper.cos(rotationPitch / 180.0F * (float) Math.PI); motionY = -MathHelper.sin(rotationPitch / 180.0F * (float) Math.PI); this.setThrowableHeading(motionX, motionY, motionZ, power * 5.0F, 1.0F); } @Override protected void entityInit() { dataWatcher.addObject(16, Byte.valueOf((byte) 0)); } /** * Similar to setArrowHeading, it's point the throwable entity to a x, y, z * direction. */ @Override public void setThrowableHeading(double x, double y, double z, float power, float par8) { float f2 = MathHelper.sqrt_double(x * x + y * y + z * z); x /= f2; y /= f2; z /= f2; x += rand.nextGaussian() * (rand.nextBoolean() ? -1 : 1) * 0.007499999832361937D * par8; y += rand.nextGaussian() * (rand.nextBoolean() ? -1 : 1) * 0.007499999832361937D * par8; z += rand.nextGaussian() * (rand.nextBoolean() ? -1 : 1) * 0.007499999832361937D * par8; x *= power; y *= power; z *= power; motionX = x; motionY = y; motionZ = z; float f3 = MathHelper.sqrt_double(x * x + z * z); prevRotationYaw = rotationYaw = (float) (Math.atan2(x, z) * 180.0D / Math.PI); prevRotationPitch = rotationPitch = (float) (Math.atan2(y, f3) * 180.0D / Math.PI); ticksInGround = 0; } @Override @SideOnly(Side.CLIENT) /** * Sets the position and rotation. Only difference from the other one is no bounding on the rotation. Args: posX, * posY, posZ, yaw, pitch */ public void setPositionAndRotation2(double x, double y, double z, float par7, float par8, int par9) { this.setPosition(x, y, z); this.setRotation(par7, par8); } @Override @SideOnly(Side.CLIENT) /** * Sets the velocity to the args. Args: x, y, z */ public void setVelocity(double motionX, double motionY, double motionZ) { this.motionX = motionX; this.motionY = motionY; this.motionZ = motionZ; if (prevRotationPitch == 0.0F && prevRotationYaw == 0.0F) { float f = MathHelper.sqrt_double(motionX * motionX + motionZ * motionZ); prevRotationYaw = rotationYaw = (float) (Math.atan2(motionX, motionZ) * 180.0D / Math.PI); prevRotationPitch = rotationPitch = (float) (Math.atan2(motionY, f) * 180.0D / Math.PI); prevRotationPitch = rotationPitch; prevRotationYaw = rotationYaw; this.setLocationAndAngles(posX, posY, posZ, rotationYaw, rotationPitch); ticksInGround = 0; } } /** * Called to update the entity's position/logic. */ @Override public void onUpdate() { super.onUpdate(); if (prevRotationPitch == 0.0F && prevRotationYaw == 0.0F) { float f = MathHelper.sqrt_double(motionX * motionX + motionZ * motionZ); prevRotationYaw = rotationYaw = (float) (Math.atan2(motionX, motionZ) * 180.0D / Math.PI); prevRotationPitch = rotationPitch = (float) (Math.atan2(motionY, f) * 180.0D / Math.PI); } int i = worldObj.getBlockId(xTile, yTile, zTile); if (i > 0) { Block.blocksList[i].setBlockBoundsBasedOnState(worldObj, xTile, yTile, zTile); AxisAlignedBB axisalignedbb = Block.blocksList[i].getCollisionBoundingBoxFromPool(worldObj, xTile, yTile, zTile); if (axisalignedbb != null && axisalignedbb.isVecInside(worldObj.getWorldVec3Pool().getVecFromPool(posX, posY, posZ))) { inGround = true; } } if (arrowShake > 0) { --arrowShake; } if (inGround) { // this.setDead(); int j = worldObj.getBlockId(xTile, yTile, zTile); int k = worldObj.getBlockMetadata(xTile, yTile, zTile); if (j == inTile && k == inData) { ++ticksInGround; if (ticksInGround == 1) { for (int lmnop = 0; lmnop < 16; lmnop++) { float xVel = (rand.nextFloat() - 0.5F ) * 5; float yVel = (rand.nextFloat() - 0.5F ) * 5; float zVel = (rand.nextFloat() - 0.5F ) * 5; worldObj.spawnParticle("smoke", posX, posY, posZ, xVel, yVel, zVel); } } if (ticksInGround == 1200) { this.setDead(); } } else { inGround = false; motionX *= rand.nextFloat() * 0.2F; motionY *= rand.nextFloat() * 0.2F; motionZ *= rand.nextFloat() * 0.2F; ticksInGround = 0; ticksInAir = 0; } } else { ++ticksInAir; if (ticksInAir == 1200) { this.setDead(); } if (posY >= 512) { this.setDead(); } Vec3 vec3 = worldObj.getWorldVec3Pool().getVecFromPool(posX, posY, posZ); Vec3 vec31 = worldObj.getWorldVec3Pool().getVecFromPool(posX + motionX, posY + motionY, posZ + motionZ); MovingObjectPosition movingobjectposition = worldObj.rayTraceBlocks_do_do(vec3, vec31, false, true); vec3 = worldObj.getWorldVec3Pool().getVecFromPool(posX, posY, posZ); vec31 = worldObj.getWorldVec3Pool().getVecFromPool(posX + motionX, posY + motionY, posZ + motionZ); if (movingobjectposition != null) { vec31 = worldObj.getWorldVec3Pool().getVecFromPool(movingobjectposition.hitVec.xCoord, movingobjectposition.hitVec.yCoord, movingobjectposition.hitVec.zCoord); } Entity entity = null; List list = worldObj.getEntitiesWithinAABBExcludingEntity(this, boundingBox.addCoord(motionX, motionY, motionZ).expand(1.0D, 1.0D, 1.0D)); double d0 = 0.0D; int l; float f1; for (l = 0; l < list.size(); ++l) { Entity entity1 = (Entity) list.get(l); if (entity1.canBeCollidedWith() && (entity1 != shootingEntity || ticksInAir >= 5)) { f1 = 0.3F; AxisAlignedBB axisalignedbb1 = entity1.boundingBox.expand(f1, f1, f1); MovingObjectPosition movingobjectposition1 = axisalignedbb1.calculateIntercept(vec3, vec31); if (movingobjectposition1 != null) { double d1 = vec3.distanceTo(movingobjectposition1.hitVec); if (d1 < d0 || d0 == 0.0D) { entity = entity1; d0 = d1; } } } } if (entity != null) { movingobjectposition = new MovingObjectPosition(entity); } if (movingobjectposition != null && movingobjectposition.entityHit != null && movingobjectposition.entityHit instanceof EntityPlayer) { EntityPlayer entityplayer = (EntityPlayer) movingobjectposition.entityHit; if (entityplayer.capabilities.disableDamage || shootingEntity instanceof EntityPlayer && !((EntityPlayer) shootingEntity).func_96122_a(entityplayer)) { movingobjectposition = null; } } float f2; float f3; if (movingobjectposition != null) { if (movingobjectposition.entityHit != null) { f2 = MathHelper.sqrt_double(motionX * motionX + motionY * motionY + motionZ * motionZ); int i1 = MathHelper.ceiling_double_int(f2 * damage); DamageSource damagesource = null; if (shootingEntity == null) { damagesource = DamageSource.causeThrownDamage(this, this); } else { damagesource = DamageSource.causeThrownDamage(this, shootingEntity); } if (this.isBurning() && !(movingobjectposition.entityHit instanceof EntityEnderman)) { movingobjectposition.entityHit.setFire(5); } if (movingobjectposition.entityHit.attackEntityFrom(damagesource, i1)) { if (movingobjectposition.entityHit instanceof EntityLiving) { EntityLiving entityliving = (EntityLiving) movingobjectposition.entityHit; if (!worldObj.isRemote) { entityliving.setArrowCountInEntity(entityliving.getArrowCountInEntity() + 1); } if (knockbackStrength > 0) { f3 = MathHelper.sqrt_double(motionX * motionX + motionZ * motionZ); if (f3 > 0.0F) { movingobjectposition.entityHit.addVelocity(motionX * knockbackStrength * 0.6000000238418579D / f3, 0.1D, motionZ * knockbackStrength * 0.6000000238418579D / f3); } } if (shootingEntity != null) { EnchantmentThorns.func_92096_a(shootingEntity, entityliving, rand); } if (shootingEntity != null && movingobjectposition.entityHit != shootingEntity && movingobjectposition.entityHit instanceof EntityPlayer && shootingEntity instanceof EntityPlayerMP) { ((EntityPlayerMP) shootingEntity).playerNetServerHandler .sendPacketToPlayer(new Packet70GameEvent(6, 0)); } } this.playSound("random.bowhit", 1.0F, 1.2F / (rand.nextFloat() * 0.2F + 0.9F)); if (!(movingobjectposition.entityHit instanceof EntityEnderman)) { this.setDead(); } } else { motionX *= -0.10000000149011612D; motionY *= -0.10000000149011612D; motionZ *= -0.10000000149011612D; rotationYaw += 180.0F; prevRotationYaw += 180.0F; ticksInAir = 0; } } else { xTile = movingobjectposition.blockX; yTile = movingobjectposition.blockY; zTile = movingobjectposition.blockZ; inTile = worldObj.getBlockId(xTile, yTile, zTile); inData = worldObj.getBlockMetadata(xTile, yTile, zTile); motionX = (float) (movingobjectposition.hitVec.xCoord - posX); motionY = (float) (movingobjectposition.hitVec.yCoord - posY); motionZ = (float) (movingobjectposition.hitVec.zCoord - posZ); f2 = MathHelper.sqrt_double(motionX * motionX + motionY * motionY + motionZ * motionZ); posX -= motionX / f2 * 0.05000000074505806D; posY -= motionY / f2 * 0.05000000074505806D; posZ -= motionZ / f2 * 0.05000000074505806D; this.playSound("random.bowhit", 1.0F, 1.2F / (rand.nextFloat() * 0.2F + 0.9F)); inGround = true; arrowShake = 7; if (inTile != 0) { Block.blocksList[inTile].onEntityCollidedWithBlock(worldObj, xTile, yTile, zTile, this); } } } posX += motionX; posY += motionY; posZ += motionZ; f2 = MathHelper.sqrt_double(motionX * motionX + motionZ * motionZ); rotationYaw = (float) (Math.atan2(motionX, motionZ) * 180.0D / Math.PI); for (rotationPitch = (float) (Math.atan2(motionY, f2) * 180.0D / Math.PI); rotationPitch - prevRotationPitch < -180.0F; prevRotationPitch -= 360.0F) { ; } while (rotationPitch - prevRotationPitch >= 180.0F) { prevRotationPitch += 360.0F; } while (rotationYaw - prevRotationYaw < -180.0F) { prevRotationYaw -= 360.0F; } while (rotationYaw - prevRotationYaw >= 180.0F) { prevRotationYaw += 360.0F; } rotationPitch = prevRotationPitch + (rotationPitch - prevRotationPitch) * 0.2F; rotationYaw = prevRotationYaw + (rotationYaw - prevRotationYaw) * 0.2F; if (this.isInWater()) { for (int j1 = 0; j1 < 4; ++j1) { f3 = 0.25F; worldObj.spawnParticle("bubble", posX - motionX * f3, posY - motionY * f3, posZ - motionZ * f3, motionX, motionY, motionZ); } } if (!worldObj.isRemote) { for (int lmnop = 0; lmnop < 50; lmnop++) { float rand1 = (rand.nextFloat() - 0.5F) * 2; System.out.println(motionX); ParticleEffects.spawnParticle("crossbowTrail", posX + motionX * l / 4.0D, posY + motionY * l / 4.0D, posZ + motionZ * l / 4.0D, -motionX * rand1, -motionY * rand1, -motionZ * rand1); } } this.setPosition(posX, posY, posZ); this.doBlockCollisions(); } } /** * (abstract) Protected helper method to write subclass entity data to NBT. */ @Override public void writeEntityToNBT(NBTTagCompound tagcompound) { tagcompound.setShort("xTile", (short) xTile); tagcompound.setShort("yTile", (short) yTile); tagcompound.setShort("zTile", (short) zTile); tagcompound.setByte("inTile", (byte) inTile); tagcompound.setByte("inData", (byte) inData); tagcompound.setByte("shake", (byte) arrowShake); tagcompound.setByte("inGround", (byte) (inGround ? 1 : 0)); tagcompound.setDouble("damage", damage); } /** * (abstract) Protected helper method to read subclass entity data from NBT. */ @Override public void readEntityFromNBT(NBTTagCompound tagcompound) { xTile = tagcompound.getShort("xTile"); yTile = tagcompound.getShort("yTile"); zTile = tagcompound.getShort("zTile"); inTile = tagcompound.getByte("inTile") & 255; inData = tagcompound.getByte("inData") & 255; arrowShake = tagcompound.getByte("shake") & 255; inGround = tagcompound.getByte("inGround") == 1; if (tagcompound.hasKey("damage")) { damage = tagcompound.getDouble("damage"); } } /** * returns if this entity triggers Block.onEntityWalking on the blocks they * walk on. used for spiders and wolves to prevent them from trampling crops */ @Override protected boolean canTriggerWalking() { return false; } @Override @SideOnly(Side.CLIENT) public float getShadowSize() { return 0.0F; } //@Override public void setDamage(double damage) { this.damage = damage; } //@Override public double getDamage() { return damage; } /** * Sets the amount of knockback the arrow applies when it hits a mob. */ //@Override public void setKnockbackStrength(int knockbackStrength) { this.knockbackStrength = knockbackStrength; } /** * If returns false, the item will not inflict any damage against entities. */ @Override public boolean canAttackWithItem() { return false; } @Override public Entity getThrower() { return shootingEntity; } @Override public void setThrower(Entity entity) { shootingEntity = entity; } } If you want to see more code you can check here: github.com/Rekkyn/spacetimemod Any help is appreciated!

I've got an interesting problem for you. Minecraft crashes seemingly randomly when my arrow-like entity is in the world. It only happens occasionally and at any point of the flight path. The weird part is that the console says the crash was caused by some other entity, like a sheep, creeper, etc. instead of my entity. I have no idea what I've done wrong so I've come to the experts. Here's an example of the crash log: And here's my entity class: If you need to see more code you can check here: github.com/Rekkyn/spacetimemod Thanks in advance!