Hello Internet,

I want to ask you, how i can simulate a rightclick clientside, to let the player place a block.

Thank you for any kind of help!

Yes, send the packet for the key binding associated to the right click.

I found a solution:

public static void placeBlock() {
		Minecraft mc = Minecraft.getMinecraft();
		EntityPlayerSP player = mc.thePlayer;
		if(player != null && player.getHeldItem() != null && player.getHeldItem().getItem() instanceof ItemBlock && mc.objectMouseOver != null && mc.objectMouseOver.typeOfHit == MovingObjectType.BLOCK) {
			mc.playerController.func_178890_a(player, mc.theWorld, player.getHeldItem(), mc.objectMouseOver.getBlockPos(), mc.objectMouseOver.sideHit, mc.objectMouseOver.hitVec);
			player.swingItem();
		}
	}