excessive time for building collision tree

[Bird]

Building a collision tree in debug mode with optimization on is taking an unusually long time. Here's some test results.

vertices: 266
triangles: 528

optimization on
-------------------
debug: NewtonTreeCollision build time: 23.033 seconds
release: NewtonTreeCollision build time: 0.0691934 seconds

optimization off
---------------------
debug: NewtonTreeCollision build time: 0.453699 seconds
releae: NewtonTreeCollision build time: 0.0217953 seconds

I also included PhysX times to process the same mesh. I realize Newton is doing a lot of work to create the mesh but I was wondering if there's any way it can be sped up or offloaded to another thread for processing.

PhysX
--------
debug: PxTriangleMeshGeometry build time: 0.00290725 seconds
release: PxTriangleMeshGeometry build time: 0.00182471 seconds

-Bird

[PJani]

Heh u can't depend on debug build, because there are so many realtime checks that is impossible to get real estimate of usage.

[Bird]

Heh u can't depend on debug build, because there are so many realtime checks that is impossible to get real estimate of usage.

Yeah, but 23 seconds to process a few hundred vertices seems a bit extreme to me.

-Brid

[Julio Jerez]

It takes 23 second to build a mesh of 266 vertices in debug? can I see that mesh?
some of the building mesh I have is the demo sandbox have a lot more vertices and face that that.
for example the Sponza building has 31902 vertices and 59892 faces and

debug
optimize time 11.7 second to build;
un optimized time 16.9 second to build;

release
optimize time 1.35 seconds to build;


the reason the optimized is faster is because as the mesh complexity become larges , the optimization reduce the vertex and face count, and the secund part which calculate faces adjacency operates in a much lower face count
that meshes have over 59000 face, that more than a 100 times what you are using.
23 second in one mesh sound to much to me that must be some error in you test.
can I see that mesh ?

as for Phyx being faster, the answer is that the collision mesh in Newton are superior that in Phyx,
Physx and must library take the mesh as vertex list index list, the put the burden of the mesh list construction on the cline application.
new does for the vertex list only.
Physx does not convex the mesh into a convex face list, Newton does.
Newton makes an absolute optimal Delaunay constrained triangulation of the mesh input mesh, the guaranty the each face maximize the area, lead to better collision.
Phyx X simple take the mash as it is give to it.
finally Newton mesh is not a simple vertex list index list, if is a graphs with edge adjacency information.

each and every one of these algorithm are highly optimized, the difference is that Newton run them on the mesh not other physics library does
The final Newton collision mesh is a extremely high quality.
an way to test this will be to save the mesh generated by both library an load then in the visual editor so that you can see why this difference in time. you should see the Newton mesh with few faces, and the face mush well formed that the input triangle list index list.

as for make an of line process it is not that simple because the containers in the engine are no thread safe. Making then thread safe will penalize some of the run time code with unnecessary lock/unlock
someday will extend the containers to make the literature thread safe , but that a long turn project.


The collision tree mesh can be serialized, would that be a solution for you?

[Julio Jerez]

In the latest demo I am using a mesh I called play ground, it have more than 500 faces, and it takes

debug 0.084 secunds
release 0.006 secunds

you have to have a bug some where, those 23 secudn do no sound right to me.

[Bird]

In the latest demo I am using a mesh I called play ground, it have more than 500 faces, and it takes

debug 0.084 secunds
release 0.006 secunds

you have to have a bug some where, those 23 secudn do no sound right to me.

The mesh is just a sphere. Here's the serialized file.
http://www.hurleyworks.com/downloads/SphereStaticMesh.zip

It takes 23 second to build a mesh of 266 vertices in debug?

Only if optimization is on NewtonTreeCollisionEndBuild(collision, 1);

I'll check my code again but the only change I make is setting optimization on or off and the build times change from .45 secs to 23 secs

So calling NewtonTreeCollisionEndBuild(collision, 1) is 23 seconds
and calling NewtonTreeCollisionEndBuild(collision, 0 ) is .45 seconds

There's no other changes in my code.
-Bird

[Julio Jerez]

A seirialze mesh will no work because ther are simple laded.
I will make a 266 sphere in Max and load it to see if I can reproduce it.

what radius size you use?

[Bird]

A seirialze mesh will no work because ther are simple laded.
I will make a 266 sphere in Max and load it to see if I can reproduce it.

what radius size you use?

.5 meters

-Bird

[Julio Jerez]

Ok I just made as 24 segment radius 0.5 sphere in Max, (266 vetices and 288 quad faces)
I load the sphere.ngd in the sandbox demo and in debug mode it takes

32 bit mode debug
optimize on: 0.136 secunds
optimize off: 0.164 secunds

in 64 bit mode in debug,
optimize on: 0.153 secunds
optimize off: 0.170 secunds
those figure look nomal to me, no where near 23 secunds

here is the NGD file you can save as "sphere.ngd" and load in the demo snad box, please see if this is what you see.

Code: Select all

<?xml version="1.0" ?>
<NewtonGameDynamnics>
    <header description="Newton Dynamnics 3.00, universal file format" revision="103" />
    <nodes count="6">
        <dRootNodeInfo>
            <dNodeInfo name="rootNode" />
            <childrenNodes count="3" indices="1 2 4" />
        </dRootNodeInfo>
        <dSceneNodeInfo>
            <dNodeInfo name="levelGeometry" />
            <color float4="0.750000 0.750000 0.000000 0.000000" />
            <transform position="-0.007675 0.000000 -0.001208 1.000000" eulerAngles="-0.000000 -0.000000 -0.000000 0.000000" localScale="1.000000 1.000000 1.000000 1.000000" stretchAxis="1.000000 0.000000 0.000000 0.000000 0.000000 1.000000 0.000000 0.000000 0.000000 0.000000 1.000000 0.000000 0.000000 0.000000 0.000000 1.000000" />
            <parentNodes count="1" indices="0" />
            <childrenNodes count="1" indices="3" />
        </dSceneNodeInfo>
        <dSceneCacheInfo cacheId="-7649022316178375635">
            <dNodeInfo name="dGeometryCache" />
            <parentNodes count="1" indices="0" />
            <childrenNodes count="1" indices="3" />
        </dSceneCacheInfo>
        <dMeshNodeInfo>
            <dGeometryNodeInfo>
                <dNodeInfo name="levelGeometry_mesh" />
                <pivotMatrix float16="1.000000 -0.000000 0.000000 0.000000 0.000000 1.000000 -0.000000 0.000000 0.000000 0.000000 1.000000 0.000000 0.000000 0.000000 0.000000 1.000000" />
            </dGeometryNodeInfo>
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EDIT:
I corrected the profile figures, the first figures were for a sphere of 1 metter in radius, whan I make the phsre 0.5 meter the time is large but less than on then of a secunds in all configurations.
the lareg tiem for a snmaller object is nor,a;l because asmalle body has spllaer faces an dteh adjecent use a pass tah aabb of each face by a fix value, so as teh face get small the ration between padding and usef care go largers, and more adjecen faces are visited.
but we are taking of numen that at of teh oredre of 100 or tiem lowe than what you are seeing

[Bird]

here is the NGD file you can save as "sphere.ngd" and load in the demo snad box, please see if this is what you see.

I'm not sure how to load a .ngd file into the sandbox demo. There is no load option in the gui for meshes. Should a try to make a new demo scene to load it from?

-Bird

[Julio Jerez]

Oh I forget that I commneted out loading ngd temporarilly, I will re enable it tonight.
you can use the the function that load as a mesh level, paste thsi lien on a any demo
CreateLevelMesh (scene, "myMeshName.ngd", true);


then you can set a break point on function,
static NewtonBody* CreateLevelMeshBody (NewtonWorld* const world, DemoEntity* const ent, bool optimization)

file ..\applications\demosSandbox\sdkDemos\toolBox\PhysicsUtils.cpp
line 1022

// measure the time to build a collision tree
timer0 = (dGetTimeInMicrosenconds() - timer0) / 1000;


// Get the root Matrix
dMatrix matrix (ent->CalculateGlobalMatrix(NULL));

time0 is the time in mili Secunds that it took from passing all the the triangle until it build the collision tree mesh.

[Bird]

Hmm, the value I get for timer0 after building the tree is 17133. But it sure didn't seem like it took 17 seconds to compute ... it seemed more like less than 1 second.

Now I'm really confused.

-Bird

[Julio Jerez]

did you set the break point on this line

// Get the root Matrix
dMatrix matrix (ent->CalculateGlobalMatrix(NULL));

[Bird]

did you set the break point on this line

// Get the root Matrix
dMatrix matrix (ent->CalculateGlobalMatrix(NULL));;

D'uh!. I'm an idiot I had set break at the top of the CreateLevelMeshBody function and was stepping down through the code until I got to that line. No wonder it took 17 seconds

If I put the break at dMatrix matrix (ent->CalculateGlobalMatrix(NULL)), then timer0 = 290 milliseconds which makes a lot more sense.

I'll look more closely on my end again and see If I can find a problem. Another strange thing I'm experiencing is that when I make scenes to test the new Continuous Collision, some of the scenes are failing in my LW plugin but when I export/import into the Sandbox demo, they work fine.

-Bird

[Julio Jerez]

Another strange thing I'm experiencing is that when I make scenes to test the new Continuous Collision, some of the scenes are failing in my LW plugin but when I export/import into the Sandbox demo, they work fine.

does the lighwave scene works if CCD if off, in lighwave.
I may be that the serilized data is not saving teh CCD flag and the scen in running with CCD off.
can you send me a serialized scene from lighwave with CCD? not too big so that It is eassy to debug