Search found 65 matches

by KKlouzal
Wed Oct 01, 2014 1:20 am
Forum: General Bullet Physics Support and Feedback
Topic: 'Welding' Objects Together
Replies: 4
Views: 6294

'Welding' Objects Together

I'm trying to essentially parent two objects without actually parenting them since I've read that two dynamic objects can't/shouldn't be parented together. I've created a quick video visualizing my question along with much more detailed audio explanation. https://www.youtube.com/watch?v=uSgdZnB5zDM ...
by KKlouzal
Mon Sep 29, 2014 8:32 pm
Forum: General Bullet Physics Support and Feedback
Topic: The Broadphase
Replies: 5
Views: 7073

Re: The Broadphase

Thank you xexuxjy. My original thought was to look into Simulation Island's and see if that mechanism could give me the data I'm looking for however I read in a few very old topics that they are only used for objects that have gone into their sleep state. More information about Simulation Island's a...
by KKlouzal
Fri Sep 26, 2014 10:47 pm
Forum: General Bullet Physics Support and Feedback
Topic: The Broadphase
Replies: 5
Views: 7073

Re: The Broadphase

Thank you, I appreciate your help Basroli. What I've been able to gather is eventually all objects that can collide will end up in the tree, hopefully this means that no objects in the simulation are left out of the tree, unless of course maybe idle objects. It also sounds like it is possible to sea...
by KKlouzal
Fri Sep 26, 2014 9:44 am
Forum: General Bullet Physics Support and Feedback
Topic: The Broadphase
Replies: 5
Views: 7073

The Broadphase

I'm looking for some more detailed information about the btDbvtBroadphase. It is to my understanding that the broadphases purpose is to group individual objects into small lists based on how likely they are to collide. Could someone give a more detailed explanation about this? If my assumption of th...
by KKlouzal
Sat Sep 13, 2014 3:37 pm
Forum: General Bullet Physics Support and Feedback
Topic: Do I need a 3D renderer if bullet has a debug drawer ??
Replies: 1
Views: 3559

Re: Do I need a 3D renderer if bullet has a debug drawer ??

The debug drawing is simply that, rendering the debugging information. If your motivation behind using Bullet is for some scientific research, robotics engineering, etc.. then that should be sufficient. If you're trying to develop an interactive application then your not going to be able to get the ...
by KKlouzal
Tue Sep 09, 2014 7:27 pm
Forum: General Bullet Physics Support and Feedback
Topic: Telling Bullet That Something Happened In The Past
Replies: 28
Views: 46457

Re: Telling Bullet That Something Happened In The Past

Predicting interactions with programmed events and standard dynamic objects not affected by a second player is easy. The issue is trying to predict player actions that will result in a change in what the predicted physics see. How much would predicting players cost you? 1ms? 100ms? 1 failed update ...
by KKlouzal
Tue Sep 09, 2014 4:59 pm
Forum: General Bullet Physics Support and Feedback
Topic: Simplified Convex Decomposition Demo
Replies: 6
Views: 8509

Re: Simplified Convex Decomposition Demo

I've narrowed the issue down to the centroid calculation. If I remove these lines: Centroid /= (float(nPoints)); Centroid += Vertex; Then the cube models vertices are correct, the bunny model's vertices are not all scattered around anymore however they are all piled on top of each other as if the in...
by KKlouzal
Mon Sep 08, 2014 10:49 pm
Forum: General Bullet Physics Support and Feedback
Topic: Telling Bullet That Something Happened In The Past
Replies: 28
Views: 46457

Re: Telling Bullet That Something Happened In The Past

@Granyte, of course lowering the update rate for far away objects and removing updates for culled objects are basic optimizations that must be implemented. Those two alone will drastically reduce bandwidth consumption. To take it a step further would be having clients predict the physics interaction...
by KKlouzal
Thu Sep 04, 2014 9:49 pm
Forum: General Bullet Physics Support and Feedback
Topic: Can we create a RigidBody without a CollisionObject ?
Replies: 1
Views: 4745

Re: Can we create a RigidBody without a CollisionObject ?

Try passing 'NULL' or 'nullptr' and see what happens?
by KKlouzal
Thu Sep 04, 2014 6:55 am
Forum: General Bullet Physics Support and Feedback
Topic: Simplified Convex Decomposition Demo
Replies: 6
Views: 8509

Re: Simplified Convex Decomposition Demo

Thank you very much for the reply Erwin, I was pulling my hair out with this. I'm looking forward to the new demo. If it were able to show how to take a vector of raw vertices and a vector of raw indices and output a btCompoundShape as I'm trying to do here that would probably be as simplistic as it...
by KKlouzal
Wed Sep 03, 2014 5:27 pm
Forum: General Bullet Physics Support and Feedback
Topic: Simplified Convex Decomposition Demo
Replies: 6
Views: 8509

Re: Simplified Convex Decomposition Demo

Has nobody ever used HACD before? :<
by KKlouzal
Tue Sep 02, 2014 1:22 pm
Forum: General Bullet Physics Support and Feedback
Topic: Simplified Convex Decomposition Demo
Replies: 6
Views: 8509

Re: Simplified Convex Decomposition Demo

Here is a video showing the previous code without the Centroid calculations commented out: http://youtu.be/XW9yLiZkrDk?t=1m The bunny model at 1:00 in the video might have other problems but I can only hope it suffers from the same issue the cubes have except it's just extremely amplified due to the...
by KKlouzal
Tue Sep 02, 2014 11:13 am
Forum: General Bullet Physics Support and Feedback
Topic: Simplified Convex Decomposition Demo
Replies: 6
Views: 8509

Simplified Convex Decomposition Demo

Are there any simplified convex decomposition demos or examples floating around out there? A forum/google search only returns a handful of results about the subject. I've been using the supplied ConvexDecompositionDemo however the code feels like a mess to me and I'm having a hard time deciphering o...
by KKlouzal
Mon Sep 01, 2014 1:27 pm
Forum: General Bullet Physics Support and Feedback
Topic: HACD/GImpact Determinism
Replies: 1
Views: 3458

HACD/GImpact Determinism

I have a couple questions about HACD, GImpact, and determinism. I understand HACD allows you to take a concave polygonal mesh and reduce it down to many convex objects. How deterministic is this process? I'm not very familiar with GImpact can it be used for the same reason stated above? If so how de...
by KKlouzal
Wed Aug 27, 2014 11:06 am
Forum: General Bullet Physics Support and Feedback
Topic: 6000 static objects: best strategy ?
Replies: 4
Views: 6946

Re: 6000 static objects: best strategy ?

1 draw call vs 10 draw calls is nothing in comparison to 6000 draw calls. You shouldn't notice any difference. It all does however eventually add up. EDIT: and then it hit me like a ton of bricks, you're talking about bullet's performance. My previous statement should still be valid, better let some...