Colonel_Tetsuya wrote:And none of it's advantages.
Entirely depends on the surface area of the way the vehicle interracts with the ground; a tank with tracks and a robot with large feet probably have nearly identical ground pressure. The difference is that when a tank gets stuck in mud, it needs a special tow truck to pull it out. A robot is likely to be able to pull itself out. Also, while a tank or other vehicle might have faster travel speed over any terrain on which it cant ravel, it certainly isnt going to say.. climb a mountainside... yet Triax has vehicles which can do just that. ANother major advantage of robots? Dodging. A tank cant sidestep an incoming laser blast; it can maybe make an evade attempt if it is already moving along at a clip, but a robot can be standing still and jump out of the way just like a human can. It can also parry incoming melee attacks from a giant opponent, and defend itself in melee combat. Payload is largely irrelevant for most weapons used by both vehicles, as energy weapons on large vehicles tend to be tied into large reactors, rendering that point moot.
I'm not saying tanks are completely useless or bad. They aren't, but there's also a very good argument to be made for them, particularly in the world of Rifts. Tanks still have a role to fill (cheaper to produce, great for supporting infantry) and are still used by the major powers that can afford to field both. If they cant afford to field both - robots can fill both roles.
Well, I was addressing the concept of giant robots done in "real life" (or something approximating it). But really, everything I've pointed out still stands. Any superawesome technology you include in the construction of a giant robot, you can include in a more conventional vehicle specialized for its role, and it will outperform any giant robot in that role.
I mean, if you've got the tech to make a 7-8 meter humanoid robot dodge incoming fire, you've very likely got the tech to make a conventional vehicle at least that hard to hit (mind you, dodging something that's already been fired at you is basically impossible, so again there's no real advantage to the robot). Unless your robot has utterly enormous feet relative to its size, it's going to have a higher ground pressure than a conventional vehicle, which is going to be a world of hurt, particularly in your mud example, and especially if you're expecting it to move like a human body - think of the forces it would be applying to relatively soft earth while trying to dive out of the way of something. Solid ground to us is going to be like banana peels or fresh-turned fields to a giant robot.
A multi-ton humanoid robot isn't going to be much more successful in climbing a mountainside than a tracked tank is, because it's going to have to find purchase, and then find purchase that isn't simply going to tear away from the mountainside with several extra tons of mass hanging from it on an oblique angle. In both cases you're better off going around or using an airlift or cable winch or something along those lines.
Conventional vehicles can still carry heavier armor, weapons, and reactors for the same volume, while having a much lower profile. A low-slung conventional tank can have sloped armor to deflect incoming fire and increase its effective thickness - something you can't really do with a vertically-standing humanoid shape. A humanoid robot is going to be covered in weak points, because fully-articulated joints are going to limit how armored those joints can be. A humanoid robot has a high center of gravity, making it much, much easier to knock over and thus render its weapons less effective - modern MBTs can survive (relatively-) nearby nuclear detonations provided they can find a low spot to hunker down in.
As for melee... well, conventional vehicles don't really do melee. But there's nothing stopping you from putting a big vibroblade on an articulated armature on your tank, if you really want to. Or a vibro-ram-prow to cut the legs off of an annoying robot. Or cable-net launchers to immobilize giant machines that rely on limbs to move. Or just running away while rotating its turret to fire behind it with absolutely no aim penalties because they're designed to do things like that.
Another way to put it: a human being is a pretty versatile animal, but one for one, a leopard is a better killer, a dolphin is a better swimmer, a bird is a better flier. Or, humans are good at things, but the specialized machines we build are much better at their roles than we are, and none of those machines look anything like us.
In Rifts (and most games involving such robots) all of these problems are just sort of handwaved away, or dealt with by some kind of fictionite material that for some reason doesn't apply to conventional vehicles (protoculture?). Because
giant robots are cool. And there's nothing wrong with that.
"Then you can simply spead the ground dried corpse bits amongst the plants as needed." - Sir Ysbadden
"There weren't many nukes launched in the apocalypse, so the nuclear winter wasn't that bad." - Killer Cyborg