jetpack.java

		if(jump)
		{
			int xDir = 0, zDir = 0;
			
			if(forward)
			{
				zDir += 1;
			}
			
			if(back)
			{
				zDir -= 1;
			}
			
			if(left)
			{
				xDir += 1;
			}
			
			if(right)
			{
				xDir -= 1;
			}
			
			double yaw = (player.rotationYaw / 180) * Math.PI;
			
			player.motionX += ((xDir * Math.cos(yaw)) - (zDir * Math.sin(yaw))) * 0.06;
			player.motionZ += ((xDir * Math.sin(yaw)) + (zDir * Math.cos(yaw))) * 0.06;
			
			double maxVert = 0.4, maxHoriz = 0.6;
			
			if(player.motionX > maxHoriz)
			{
				player.motionX = maxHoriz;
			}
			if(player.motionZ > maxHoriz)
			{
				player.motionZ = maxHoriz;
			}
			
			if(player.motionX < -maxHoriz)
			{
				player.motionX = -maxHoriz;
			}
			if(player.motionZ < -maxHoriz)
			{
				player.motionZ = -maxHoriz;
			}
			
			if(player.onGround)
			{
				player.motionY = 0.3;
			}
			else
			{
				player.motionY += 0.115;
			}
			
			if(player.motionY > maxVert)
			{
				player.motionY = maxVert;
			}
			
			player.fallDistance = 0.0f;
			player.velocityChanged = true;
		}