User mesh doesn't work

[PJani]

Try to add more than one usermesh - three or more and then remove them.
I havent test this teory...i need to go to sleep.

[Julio Jerez]

also there few bug in yor last code fragment, you are detroying a child collision that you did not create, and
you are doin more work than it is need it, you can call begin do all the work and teh call end
here si the refacyed and correct version

Code: Select all

NewtonBody* nb = getOgreNewtBody()->getNewtonBody();
NewtonCollision* const nc_root = NewtonBodyGetCollision(nb);
NewtonSceneCollisionBeginAddRemove(nc_root);
for(int i=0;i<2;i++){
    NewtonCollision* col = NewtonCreateNull(universe->getPhysicsManager()->getWorld()->getNewtonWorld());
    NewtonSceneCollisionRemoveSubCollision(nc_root, col);
}
NewtonSceneCollisionEndAddRemove(nc_root);

[PJani]

this was just for testing...

[Julio Jerez]

ha ok, tha bug was also on my test funtion, I edite teh bug.
also when added three shapes chidl shapes I was able to have the assert happens, I am fixing it now.
I beleiev teh bug is on the assert, becaus ethat funtion is use on many other places, I am verifying that.

if you continue does the code crashes?

[Julio Jerez]

Ok I beleive it is fixed now, please sync and try again. let me know what teh perofemce is using the scene

[PJani]

Now I get lastBox >= 0 assertion(check the prev atachment).

[Julio Jerez]

Ha yes, when the scene has only one node, that was the most dangerous.
Fixed, sync again please

[PJani]

Yep now it works

I must say the performance is at least 20 times better than using bodies!

I was wondering is there any way to pass some pointer to the raycast query function and access it in usermesh callback? i would need to pass some parameters to the raycast callback when i search in usermesh.

[Julio Jerez]

does not the ray cast has that? you pass function callback and user data, do you get that?
I did not understand that question.

[PJani]

Ah nevermind i found another better solution I dont need to pass stuff to raycast usermesh callback

[PJani]

I cant belive how well it works, thank you for your help
Only loading of the world is missing to complete world generation.

Now to another thing...
About materials in usermesh. As i understand they are face specific(each triangle has its own material)...

Well my materials are vertex specific and they are actually blended/interpolated, this means if you take a triangle and its vertexes and one point on the triangle you will get blended values of each three points.

What would you suggest because I can't use your system for this task. Just use custom material handler?

[Julio Jerez]

Glad you like it , Newton 3.xx is designed with Game play in mind.
the scene collision makes handling of stuff very much in the same way tat video games handle traditonal game level scene.
and I will exended more

for teh materials, in the contact callback you can get the is pointe to teh face indeces, for ther you can get the vertices, and indeces that was use to generate the faces. basically I used for dis[lay only teh face in teh AABB of the collision shape.
I will made teh demo to show the face wi th vetex color, form ther you cna buidl your funtionality, I thonk

this is a feaure that I do not use i a very long time, since 1.53 it may be broken
I see if adapat the usermesh demo to use that futionality again.

[Layla]

Sorry if it's already been brought up but is anyone having any problems with convex casting against a user mesh? It just never works, maybe its my user mesh at fault but physics works completely fine.

[Julio Jerez]

there is no reason why it would no work. once to buidl teh faces in te hcall back, it should just work.

Oh, yo umay be right, I thopnk I have to complete a function in the broaphace for that. I will verufy.

[Layla]

Thanks. Also I've always wondered, why is the hit fraction always 1.2f when nothing is hit? What does 1.2f relate to?