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ABT #272572
06/18/09 18:11
06/18/09 18:11
Joined: May 2009
Posts: 1,816
at my pc (duh)
darkinferno Offline OP
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darkinferno  Offline OP
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ok... first of all, am sure this has been asked before but i didnt get enough details... i read that the engines from lie-c to comm use ABT for levels and pro uses BSP, now... can someone explain to me how much can the ABT handle and if the engine is using ABT for comm users or lower, then, y use blocks? just trying to find out how smart a mdl based level is, over a block based...

-please dont post unecessary replies and 1 line comments, seriously, its rather annoying...

dark-

Re: ABT [Re: darkinferno] #272720
06/19/09 12:04
06/19/09 12:04
Joined: Nov 2004
Posts: 7,121
Potsdam, Brandenburg, Germany
Machinery_Frank Offline
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You will find a fantastic explanation here:
http://www.gamedev.net/community/forums/topic.asp?topic_id=123169&whichpage=1&#675554

The author compares ABT, BSP and octrees. He writes that a binary adaptive tree is fast and powerful and delivers something between BSP and octrees. It can be used with dynamic content and does not need pre-calculation.

But the re-organization of the moving objects can make it inefficient unless you re-calculate some nodes on the fly.

But for indoors you have to use it in combination with portals or occlusion geometry. Otherwise it will not do very efficient culling for this sort of environment.

Meshes in the nodes and leafs of the tree will be handled the same, no matter if they are made from blocks or from models. But I dont know about the differences of the internal rendering, materials, collision detection and other factors that can make a difference between blocks and meshes.

So in the end it depends on your project. ABT will manage and render an open scene quite well, but will have problems with bigger indoors.


Models, Textures and Games from Dexsoft
Re: ABT [Re: Machinery_Frank] #274248
06/26/09 09:25
06/26/09 09:25
Joined: Jun 2008
Posts: 151
Ukraine
XD1v0 Offline
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XD1v0  Offline
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I am sorry darkinferno that i write in this topic, i have similar question so i decided do not create new topic.
I have commercial version, so A7 for rendering levels use ABT.
I make some tests and understand that ABT do not use PVS for cliping invisible level geometry.


My questions is:
Is ABT use PVS(Potentially Visible Set) only for entities ?
Is there any sense compile level in BPS if i want speed up rendering of level geometry?


A7 Commercial cool
Celeron 1700, GeForce 5500 FX 256mb, 1 Gb Ram
Re: ABT [Re: XD1v0] #275009
06/29/09 17:45
06/29/09 17:45
Joined: May 2009
Posts: 1,816
at my pc (duh)
darkinferno Offline OP
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darkinferno  Offline OP
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no probs XD1v0, i also would love an answer for this, i'd love to know y anyone is using blocks anyways if the engine doesnt ave bsp in comm, wouldnt it make more sense to just use models and cut them up so they can be culled by the ABT... maybe this shouldve been in the 'ask developers' thread..

Re: ABT [Re: darkinferno] #275915
07/02/09 18:20
07/02/09 18:20
Joined: May 2009
Posts: 1,816
at my pc (duh)
darkinferno Offline OP
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darkinferno  Offline OP
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anyyy minute now....

Re: ABT [Re: darkinferno] #276040
07/03/09 09:52
07/03/09 09:52
Joined: Nov 2008
Posts: 946
T
the_clown Offline
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the_clown  Offline
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I still use blocks, but I know most people don't. I can partly understand this, as models don't need to be compiled that long, don't have to convex and so on. But as a bad modeller I like blocks very much.

Re: ABT [Re: the_clown] #276088
07/03/09 11:32
07/03/09 11:32
Joined: May 2009
Posts: 1,816
at my pc (duh)
darkinferno Offline OP
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darkinferno  Offline OP
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yep, i know its probably easier to make a level using blocks if you arent a modeler but the question is, does it REALLY make a difference to the engine since there is no BSP in comm.

Re: ABT [Re: darkinferno] #276095
07/03/09 11:41
07/03/09 11:41
Joined: Nov 2004
Posts: 7,121
Potsdam, Brandenburg, Germany
Machinery_Frank Offline
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Machinery_Frank  Offline
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Potsdam, Brandenburg, Germany
Why not checking it out? You could make a level with lots of simple objects using blocks and the same level with models for comparison.

I have seen similar experiments made with the Torque engine and the model levels were significantly faster than the BSP/DIF levels.


Models, Textures and Games from Dexsoft
Re: ABT [Re: Machinery_Frank] #276101
07/03/09 11:57
07/03/09 11:57
Joined: May 2009
Posts: 1,816
at my pc (duh)
darkinferno Offline OP
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darkinferno  Offline OP
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at my pc (duh)
guess i'll have to do this, just that it might not be totally accurate... kinda was hoping that i could get a straight forward, blocks are faster or whatever kind of reply, i hope so, so i can avoid posting this in the ASK THE DEVELOPERS forum...


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