MusselsNo its not. Phsyx is CAPABLE of it, but they simply cant do it. I'll try and explain it more simply.

Path 1: Make the game use a generic physics engine, for people without CUDA (old Nv cards, ATI) - Physx does as little as possible in this example, so that they dont need to duplicate any coding (two physics engines for the same items) - thats when you have items that dont collide together.

path 2: make two engines coded for everything. When physx is enabled everything moves over, and everything can interact with everything else.


If you were strapped for cash and time as a game developer with an unknown, brand new concept for a game... which would you take?

DarkMatterIn Mirror's Edge when you walk on a cloth it interacts with your character. That is when extensive PhysX is enabled and when not, I suppose it doesn't interact, because current CPUs don't have enough power to handle that kind of extensive use. If it'd be using another engine, like Havok it wouldn't interact either, you need stream power to do so, be it a GPU or a PPU. So I'm lost and don't know what are you trying to say.

Anyway, in path 1 you can take PhysX just as well as you could take any other, namely Havok, and PhysX is free. If you are not going to make anything special, the free version of PhysX, the one without access to the source code, is just enough.

ShadowFoldCell Factor doesn't work on nvidia PhysX. I tried.. And I forgot Cryostasis, but it's really the ONLY game that uses it well.. I remember trying the demo and it was ok, but ran pretty bad on a gtx 280 and didn't really see anything cool besides the mercury, I mean water.

Musselsalright, my info on the cloth stuff could be wrong.

If you want to test it, test how it works once a few holes are in the cloth - i have a suspicion they're using another physics engine for the collision detection on top of physx (walking on the cloth wont change between physx on and off, for example)

DarkMatterMan it's all physics. Period.

Musselsits a very different story if they're using multiple engines, to cover physx flaws.

Complex rigid body object physics system

The rigid body dynamics component enables you to simulate objects with a high degree of realism. It makes use of physics concepts such as reference frames, position, velocity, acceleration, momentum, forces, rotational motion, energy, friction, impulse, collisions, constraints, and so on in order to give you a construction kit with which you can build many types of mechanical devices.

* Collision primitives (sphere, box, capsule, plane, heightfield, convex shape, triangular mesh)
* Various joints types (spherical, revolute, prismatic, cylinders, fixed, distance, pulley, 6DOF)
* Advanced ragdoll, with joints, creation and editing
* Materials and friction model in support of surface collision behavior
* Continuous Collision Detection support for fast moving objects
* Raycast, sweep, trigger, and overlap test collision detection
* Collision groups + Collision Filtering – enable/disable collision detection
* One-way interactions (Body ‘X’ can effect body ‘Y’ but not vice-versa)
* Contact report allowing developers to trigger both alternate actions when specific objects interact or modify behavior of various contacts

DarkMatterThey are not using two engines. Where have you seen that PhysX has no collision? That's BS, it HAS. It's in the features list and everything.



developer.nvidia.com/object/physx_features.html

Musselsyou're ignoring what i'm saying.

I'm saying Physx items cant collide with things outside the physx engine - which means they either code two engines (one for Nv physx on and one for off) or they do a hybrid between the two (to make it lower requirements/workable in software)

They arent making 100% of the game world ported entirely the physx, or the damn thing wouldnt run without hardware acceleration!

DarkMatterAnd you are not paying attention to anything that I have said in the thread. PhysX DOESN'T REQUIRE hardware at all. It can run in software mode... :banghead:

Musselsi've done that. it runs like crap. even an OC'd Q6600 cant handle it without massive FPS decrease, so its useless on most systems.

Musselsi've done that. it runs like crap. even an OC'd Q6600 cant handle it without massive FPS decrease, so its useless on most systems.

btarunrMy Phenom 9750 seemed pretty comfortable with PhysX Screensaver with 25% particle density.

DarkMatterIt doesn't run like crap. At all. IF and only if you enable the PhysX checkbox in Mirror's Edge and disable PhysX in the CP, of course it lags. But that's all about GPU PhysX. CPUs can't handle that kind of massive physics.

Musselsso... you're saying its ok because it runs on a CPU, then your next post saying it doesnt work cause CPU's cant do it? thats... what i said.


How about we just agree to disagree? we're rehashing at this point.

TheMailMan78Link to this said screensaver? :D

Lazzer408Here we go again. They been talking Havok since the 1xxx series. I bet Duke Nukem Forever supports it.

Lazzer408It was intended as a joke.

ShadowFoldCell Factor doesn't work on nvidia PhysX. I tried.. And I forgot Cryostasis, but it's really the ONLY game that uses it well.. I remember trying the demo and it was ok, but ran pretty bad on a gtx 280 and didn't really see anything cool besides the mercury, I mean water.

MusselsYay. another reason to justify me getting my 4870.

hayder.masteryou are dumm lucky man mussels , why you don't pick 4870 from the begging