SceneCollision crash when boxes hit it (not spheres)

[agi_shi]

Hi. I used the SceneCollision functionality to create a scene of many static boxes which a "grouped together". When I drop many spheres on this SceneCollision, everything works 100%. However, if I drop boxes on the same SceneCollision, I get a hard crash that I cannot trace to anything. If I replace the SceneCollision functionality with the same exact setup via a CompoundCollision, the crash disappears - both boxes and spheres work 100%. Here is my code:

Code: Select all

// scene collision approach
//    NewtonCollision *sceneCol = NewtonCreateSceneCollision(phys::world, 0);

// compound collision approach
    std::vector<NewtonCollision*> parts;

    BOOST_FOREACH(const entityPtr &ent, ents)
    {
        mat4 mat(mat4::IDENTITY);
        mat.makeTransform(ent->pos(), vec3(1, 1, 1), ent->rot());

        float matf[16];
        convertMat4(mat, matf);

        // compound collision
        parts.push_back(NewtonCreateConvexHullModifier(phys::world, ent->collision(), 0));
        NewtonConvexHullModifierSetMatrix(parts.back(), matf);

        // scene collision
//        NewtonSceneProxy *proxy = NewtonSceneCollisionCreateProxy(sceneCol, ent->collision());
//        NewtonSceneProxySetMatrix(proxy, matf);
    }

// scene collision
//    NewtonSceneCollisionOptimize(sceneCol);
// compound collision
    NewtonCollision *sceneCol = NewtonCreateCompoundCollision(phys::world, parts.size(), &parts[0], 0);

    collision(sceneCol); // simply calls NewtonBodySetCollision()

    NewtonReleaseCollision(phys::world, sceneCol);


This happens with the latest windows build, regardless of the amount of threads.

[agi_shi]

Here's a demo that shows the crash. Just run bin/win/release/demo_low_gfx (or run the main exe if you have a powerful GPU), use WASD to move around and press SPACE to spawn a bunch of boxes, which will shortly cause the crash: http://filesmelt.com/downloader/c4v3rnz_test_build.zip

[Julio Jerez]

Ha good that people start experimenting with scene collision.

I got demo demo, and I get the crash.
I see a level that resembles a pool table with a ball that I can spin around.
when I hit space I get the boxes and the game crash.

what geometry is the Scene collision? it is the Floors an dteh borders or what?

[Julio Jerez]

I found the Bug the scene collision was not clamping the max contact count, and soem tiem teh bux land in an area with tah overlap lot of thoses boxes.
This generat a very lorge number of contact that nee to be discimunated, to ge onle teh essicail for good collision respondod.
All other pair collider have tha function at teh end but I forgot to added to teh Scene/oeh shape colliders.

It is fix now but I go the engione is a state of flux until I get this new feature I am working on now.
you will get the fix with next beta build.

what are you doing that you need to get some many intersecting shapes at amost the same location?

I kind of cool seeing the glow effect and the ball trying to navagate over the obstacles.
If you need a dll send me a PM.

[agi_shi]

Cool, thanks

I'm making a tile-based level system with level files such as the following:

Code: Select all

#################
#-----------SSSS#
#-----------SSSS#
#-----------SSSS#
#-----------SSSS#
#---------------#
#---------------#
#---------------#
#---------------#
#---------------#
#---------------#
#---------------#
#--P------------#
#---------------#
#################


Basically, every '-' is a floor and every '#' is a wall. The other pieces are mostly dynamic game-play pieces. Therefore, instead of having N amount of separate bodies for every tile, I figured I could put all of the static pieces (wall/floor) into a SceneCollision The speedup was definitely noticeable over using separate bodies. However I did get that crash, so I switched to using a CompoundCollision for now (which is a bit slower, but it's an acceptable fix for the moment). If I had the time, I would've made a more optimized level loader that combined adjacent pieces, however, I only have about 3 hours left - I'm competing in the ludumdare 48h #15 competition

[Julio Jerez]

...., I only have about 3 hours left - I'm competing in the ludumdare 48h #15 competition

Wow, oh Man you are crazy, you are compiting and at the same time findng Bugs. What esle is New.
Good luck in the context.

[agi_shi]

Heh. Here's my final entry if you're interested: http://www.ludumdare.com/compo/ludum-da ... w&uid=1175

It uses my CompoundCollision "fix". When you update the SDK, I've make a new version with the SceneCollision, which is indeed faster