Get extact MovingObjectPoition from the Player

[Kloonder]

So I used this code, but its too inaccurate, and because I have only a very small idea what these cos and sin (I know that these return numbers wich are somehow working with the rotation to 360) methods are doing, I can't really change them, sorry for bad Math

 

public static MovingObjectPosition getMovingObjectPositionFromPlayer(World world, EntityPlayer entityplayer, boolean flag, double reach)
{
	float f = 1.0F;
	float playerPitch = entityplayer.prevRotationPitch + (entityplayer.rotationPitch - entityplayer.prevRotationPitch) * f;
	float playerYaw = entityplayer.prevRotationYaw + (entityplayer.rotationYaw - entityplayer.prevRotationYaw) * f;
	double playerPosX = entityplayer.prevPosX + (entityplayer.posX - entityplayer.prevPosX) * f;
	double playerPosY = (entityplayer.prevPosY + (entityplayer.posY - entityplayer.prevPosY) * f + 1.6200000000000001D) - entityplayer.getYOffset();
	double playerPosZ = entityplayer.prevPosZ + (entityplayer.posZ - entityplayer.prevPosZ) * f;
	Vec3 vecPlayer = new Vec3(playerPosX, playerPosY, playerPosZ);
	float cosYaw = MathHelper.cos(-playerYaw * 0.01745329F - 3.141593F);
	float sinYaw = MathHelper.sin(-playerYaw * 0.01745329F - 3.141593F);
	float cosPitch = -MathHelper.cos(-playerPitch * 0.01745329F);
	float sinPitch = MathHelper.sin(-playerPitch * 0.01745329F);
	float pointX = sinYaw * cosPitch;
	float pointY = sinPitch;
	float pointZ = cosYaw * cosPitch;
	Vec3 vecPoint = vecPlayer.addVector(pointX * reach, pointY * reach, pointZ * reach);
	MovingObjectPosition movingobjectposition = world.rayTraceBlocks(vecPlayer, vecPoint, false, false, true);
	return movingobjectposition;
}

 

So I have no idea, I know there is a method in entity, but it is only Client side

[Draco18s]

public static MovingObjectPosition getMovingObjectPositionFromPlayer(World world, EntityPlayer entityplayer, boolean flag, double reach)
{
	Vec3 vecPlayer = entityplsuer.getLookVec();
	MovingObjectPosition movingobjectposition = world.rayTraceBlocks(vecPlayer, vecPoint, false, false, true);
	return movingobjectposition;
}

 

?

[Kloonder]

Well, I don't know if you perform magic to get your vec point, so used the one I already had, and that doen't work at all

[Draco18s]

Is not magic, but I did miss a line.

 

Vec3 vecPlayer = new Vec3 (entityplayer.posX,entityplayer.posY+entityplayer.eyeHeight,entityplayer.posZ);

 

Edit:

Also misnamed one var.  I am on my tablet atm.

So it should look like this

 

public static MovingObjectPosition getMovingObjectPositionFromPlayer(World world, EntityPlayer entityplayer, boolean flag, double reach)
{
	Vec3 vecPoint = entityplsuer.getLookVec();
	Vec3 vecPlayer = new Vec3 (entityplayer.posX,entityplayer.posY+entityplayer.eyeHeight,entityplayer.posZ);
	MovingObjectPosition movingobjectposition = world.rayTraceBlocks(vecPlayer, vecPoint, false, false, true);
	return movingobjectposition;
}

[Kloonder]

Well, taht doesn't seem to work, anyway, on server, it seems like the look is sometimes up to 2 blocks in x and z coords wrong, but why, maybe a minecraft problem itself, and if, how fix

[thebest108]

This is hurting me to look.

 

Its Minecraft.getMinecraft().objectMouseOver

 

Also if you need a blockPos from it use objectMouseOver.getBlockPos();

 

Whatever that was was cancer

[coolAlias]

Its Minecraft.getMinecraft().objectMouseOver

And that will crash your game when used on the SERVER, which is where the OP is trying to get a MovingObjectPosition. Not only that, but the objectMouseOver is limited in range and thus limited in use.

 

@OP What about the code is not working for you? Works fine for me:

Vec3 vec31 = new Vec3(player.posX, player.posY + player.getEyeHeight(), player.posZ);
Vec3 vec32 = new Vec3(i, j, k); // where i, j, k are coordinates of some place in the world, such as the normalized coordinates from the player's look vector multiplied by some amount indicating maximum range, e.g. 100
MovingObjectPosition mop = world.rayTraceBlocks(vec31, vec32);

However, that will only result in a hit on BLOCKS; if you want to check for an entity within the player's line of sight, this is not the solution.

[Himself12794]

I had to do something similar with my PowersAPI mod.

 

This website has a good method for getting the MovingObjectPosition client side. (At any distance as well!)

http://jabelarminecraft.blogspot.com/p/minecraft-modding-extending-reach-of.html

 

Of course, this is only client side, so you'll have to send the position over in a message to the server.

[Kloonder]

Its Minecraft.getMinecraft().objectMouseOver

And that will crash your game when used on the SERVER, which is where the OP is trying to get a MovingObjectPosition. Not only that, but the objectMouseOver is limited in range and thus limited in use.

 

@OP What about the code is not working for you? Works fine for me:

Vec3 vec31 = new Vec3(player.posX, player.posY + player.getEyeHeight(), player.posZ);
Vec3 vec32 = new Vec3(i, j, k); // where i, j, k are coordinates of some place in the world, such as the normalized coordinates from the player's look vector multiplied by some amount indicating maximum range, e.g. 100
MovingObjectPosition mop = world.rayTraceBlocks(vec31, vec32);

However, that will only result in a hit on BLOCKS; if you want to check for an entity within the player's line of sight, this is not the solution.

 

Well, that doen't work, because, you know, look:

 

I'm not quite sure what you mean with those i, j, k, so I assumed I take the players look coords and multiplie them by 100:

 

Vec3 vec31 = new Vec3(player.posX, player.posY + player.getEyeHeight(), player.posZ);
	Vec3 vec32 = new Vec3(player.getLookVec().xCoord*100, player.getLookVec().yCoord*100, player.getLookVec().zCoord*100);
	MovingObjectPosition mop = world.rayTraceBlocks(vec31, vec32);
	System.out.println(mop);

 

That gives back coords, wich are totally wrong.

 

Also:

 

Vec3 vec31 = new Vec3(player.posX, player.posY + player.getEyeHeight(), player.posZ);
	Vec3 vec32 = player.getLookVec(); 
	MovingObjectPosition mop = world.rayTraceBlocks(vec31, vec32);
	System.out.println(mop);

 

This gives back nothing

 

So I have really no idea what to do

[Himself12794]

This gives back nothing

 

So I have really no idea what to do

 

Try this. I pulled it from one of Jabelar's turorials, who pulled it from Minecraft's mouse over code:

 

 

public static MovingObjectPosition getMouseOverExtended(float dist)
{
    Minecraft mc = FMLClientHandler.instance().getClient();
    Entity theRenderViewEntity = mc.getRenderViewEntity();
    AxisAlignedBB theViewBoundingBox = new AxisAlignedBB(
            theRenderViewEntity.posX-0.5D,
            theRenderViewEntity.posY-0.0D,
            theRenderViewEntity.posZ-0.5D,
            theRenderViewEntity.posX+0.5D,
            theRenderViewEntity.posY+1.5D,
            theRenderViewEntity.posZ+0.5D
            );
    MovingObjectPosition returnMOP = null;
    if (mc.theWorld != null)
    {
        double var2 = dist;
        returnMOP = theRenderViewEntity.rayTrace(var2, 0);
        double calcdist = var2;
        Vec3 pos = theRenderViewEntity.getPositionEyes(0);
        var2 = calcdist;
        if (returnMOP != null)
        {
            calcdist = returnMOP.hitVec.distanceTo(pos);
        }
         
        Vec3 lookvec = theRenderViewEntity.getLook(0);
        Vec3 var8 = pos.addVector(lookvec.xCoord * var2, 

              lookvec.yCoord * var2, 

              lookvec.zCoord * var2);
        Entity pointedEntity = null;
        float var9 = 1.0F;
        @SuppressWarnings("unchecked")
        List<Entity> list = mc.theWorld.getEntitiesWithinAABBExcludingEntity(

              theRenderViewEntity, 

              theViewBoundingBox.addCoord(

                    lookvec.xCoord * var2, 

                    lookvec.yCoord * var2, 

                    lookvec.zCoord * var2).expand(var9, var9, var9));
        double d = calcdist;
            
        for (Entity entity : list)
        {
            if (entity.canBeCollidedWith())
            {
                float bordersize = entity.getCollisionBorderSize();
                AxisAlignedBB aabb = new AxisAlignedBB(

                      entity.posX-entity.width/2, 

                      entity.posY, 

                      entity.posZ-entity.width/2, 

                      entity.posX+entity.width/2, 

                      entity.posY+entity.height, 

                      entity.posZ+entity.width/2);
                aabb.expand(bordersize, bordersize, bordersize);
                MovingObjectPosition mop0 = aabb.calculateIntercept(pos, var8);
                    
                if (aabb.isVecInside(pos))
                {
                    if (0.0D < d || d == 0.0D)
                    {
                        pointedEntity = entity;
                        d = 0.0D;
                    }
                } else if (mop0 != null)
                {
                    double d1 = pos.distanceTo(mop0.hitVec);
                        
                    if (d1 < d || d == 0.0D)
                    {
                        pointedEntity = entity;
                        d = d1;
                    }
                }
            }
        }
           
        if (pointedEntity != null && (d < calcdist || returnMOP == null))
        {
             returnMOP = new MovingObjectPosition(pointedEntity);
        }

    }
    return returnMOP;
}

 

[Kloonder]

Well, I now use this code

 

if(world.isRemote){
					if(player.rayTrace(7, 1) != null){
						if(player.rayTrace(7, 1).hitVec != null){
							MovingObjectPosition mop = player.rayTrace(7, 1);
							Vec3 hit = mop.hitVec;
							int side = mop.sideHit.getIndex();
							MoreMinecraft.network.sendToServer(new MessageToServer(2, hit.xCoord, hit.yCoord, hit.zCoord, side, halfStep ? 1 : 0, rootUp ? 1 : 0));

 

But I somehow have the problem, that it is sometimes wrong about one block in x or z position, any ideas

[Himself12794]

Well, I now use this code

 

if(world.isRemote){
					if(player.rayTrace(7, 1) != null){
						if(player.rayTrace(7, 1).hitVec != null){
							MovingObjectPosition mop = player.rayTrace(7, 1);
							Vec3 hit = mop.hitVec;
							int side = mop.sideHit.getIndex();
							MoreMinecraft.network.sendToServer(new MessageToServer(2, hit.xCoord, hit.yCoord, hit.zCoord, side, halfStep ? 1 : 0, rootUp ? 1 : 0));

 

But I somehow have the problem, that it is sometimes wrong about one block in x or z position, any ideas

 

Try what I mentioned above. It works, trust me it does.