ROAM terrain rendering, help us make spring much faster!

[smoth]

How does that handle rocky glacier and gunmetal harbor? I want to look at try to better optimize upcoming map geometry for this.

Can I get shot for this?
Y/n

[Beherith]

Large png warning:

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You dont need to optimize, roam is quite good at it.
All frame rates were between 130 and 200+, depending on number of trees in view.

In the last two shots I cranked up the detail to ridiculous levels.

Note the 'triangles pushed' in the console.

No popping, tearing, stretching or any other artefact visible.

[smoth]

How much of a difference does the make on large maps like epic or rivervalley?

[Beherith]

None. Detail level is adjustable. It will generally try to aim to keep a constant triangle count on the visible terrain, but it wont add triangles when they dont increase detail (flat areas)

[smoth]

So they are still massive performance hogs :/?

[Beherith]

I mean roam doesnt care wether is large or small. No massive penalty on large maps.

[smoth]

Let me rephrase that ...

I am hoping the increased performance will make large maps more feasible. Right now they hurt on fps I was hoping roam could save performance in such a way as to give large maps a more equal fps cost

[PicassoCT]

Could you post a roam-screenshot of trenches or halowarez for me?

[Beherith]

Trenches is 16*64, no? If thats the one, then it fails to load in my build atm (not my fault tho, and not roam's bug)

[hoijui]

i just tried Trenches with latest master, and it did not crash. maybe it is cause i am on 64bit Linux though (-> more ram). It looked like 16x64, yes.

[PicassoCT]

Where is it, a there is it. AlgoGrims- Tales of a travelling Salesmann :

and the Algo did approach the Master meditating in n┬│-space and time, and he asked:
"Master shall i venture out into the world, having only looked upon the average-Case?"
"This shall be sufficient, on average Case, but remember if things go bad, to have a inflateable boat made of predecessor-scapegoat-skin!"
And so he ventured out of the dojo, to travell, living on watershaders and bugz alone to survive, fighting unreasonable memory demands, getting blamed for villages flattened due to bad tatic, and having all in all a great time.

[Forboding Angel]

Behe, try it on battle for edola prime. That is 32x32 and has plenty of features and junk. Should make for a good use case test on large maps.

[Satirik]

we can wait 1 or 2month more to have it in 0.83

it's been 3months now, is the 0.83 roam coming ?

[Beherith]

Ok, here is ROAM rebased to 0.83

https://github.com/Beherith/spring

TODO/known issues:
Support unsynced heightmap
Fix VBO support
Fix terraform support
ATI is slow cause of display list rebuilding
Remove some stunningly memory wasteful bits (kept to statically buffer vertex arrays)

Other info:
In Patch.h, uncomment which rendering mode you wish to use, vertexarray, displaylist or VBO

To enable ROAM, config needs a ROAM = 1 entry.

Some implementation info:
New Classes:

Landscape:
-Is a member of SMFGroundDrawer
-Contains the main initialization code
-Is the parent of the Patch classes.
Important member functions:
Explosion:
Is called by the basicmapdamage class, and tells the landscape to update specific patches

Patch:
-Each patch corresponds to a single bigtexture square (128*128 heightmap pixels)
-Each patch consists of a binary triangle tree, starts with 2 triangles
Important member functions:
ComputeVariance
Builds a variance tree for the triangle tree
Only called on init, and when the heightmap changes
Tessellate:
Splits the triangles based on variance information, distance from camera and view radius
Splits neighbouring triangles-those in neighbouring patches as well
Builds the display lists - updates the VBO's
Render:
Pushes the vertex array/calls display list/draws the VBO

Edit1:
@Forb:

Note the FPS counter...

[Anarchid]

Ok, here is ROAM rebased to 0.83

That meaning it won't get in the actual release? Oh well, can wait a bit more

[AF]

Thanks Beherith =)

@Anarchid The engine devs want the next release out as soon as possible. Given Beheriths list of work to be done, ROAM will not make it in 0.83.

[Anarchid]

Hope it makes for 0.84 then, and that it won't take another year

(i mean, it would be so very cool to have this together with assimp at last. i'm even considering getting some plugin for the messenger again so i can track commits)

[Beherith]

Some more fixes were made, it now compiles fine on linux too, thanks BrainDamage!

[xyz]

Some more fixes were made, it now compiles fine on linux too, thanks BrainDamage!

well sort of:

Code: Select all

home/xyz/programare/proiecte/springRoam/spring/rts/Map/SMF/Legacy/LegacyMeshDrawer.cpp: In constructor ÔÇÿCLegacyMeshDrawer::CLegacyMeshDrawer(CSMFReadMap*, CSMFGroundDrawer*)ÔÇÖ:                               
/home/xyz/programare/proiecte/springRoam/spring/rts/Map/SMF/Legacy/LegacyMeshDrawer.cpp:58:2: error: ÔÇÿmultiThreadDrawGroundÔÇÖ was not declared in this scope
/home/xyz/programare/proiecte/springRoam/spring/rts/Map/SMF/Legacy/LegacyMeshDrawer.cpp:59:2: error: ÔÇÿmultiThreadDrawGroundShadowÔÇÖ was not declared in this scope
/home/xyz/programare/proiecte/springRoam/spring/rts/Map/SMF/Legacy/LegacyMeshDrawer.cpp: In destructor ÔÇÿCLegacyMeshDrawer::~CLegacyMeshDrawer()ÔÇÖ:
/home/xyz/programare/proiecte/springRoam/spring/rts/Map/SMF/Legacy/LegacyMeshDrawer.cpp:66:46: error: ÔÇÿmultiThreadDrawGroundÔÇÖ was not declared in this scope
/home/xyz/programare/proiecte/springRoam/spring/rts/Map/SMF/Legacy/LegacyMeshDrawer.cpp:67:52: error: ÔÇÿmultiThreadDrawGroundShadowÔÇÖ was not declared in this scope
/home/xyz/programare/proiecte/springRoam/spring/rts/Map/SMF/Legacy/LegacyMeshDrawer.cpp: In member function ÔÇÿvirtual void CLegacyMeshDrawer::DrawMesh(const DrawPass::e&)ÔÇÖ:
/home/xyz/programare/proiecte/springRoam/spring/rts/Map/SMF/Legacy/LegacyMeshDrawer.cpp:594:19: error: ÔÇÿmultiThreadDrawGroundÔÇÖ was not declared in this scope
/home/xyz/programare/proiecte/springRoam/spring/rts/Map/SMF/Legacy/LegacyMeshDrawer.cpp: In member function ÔÇÿvoid CLegacyMeshDrawer::DrawShadowMesh()ÔÇÖ:
/home/xyz/programare/proiecte/springRoam/spring/rts/Map/SMF/Legacy/LegacyMeshDrawer.cpp:966:19: error: ÔÇÿmultiThreadDrawGroundShadowÔÇÖ was not declared in this scope
make[2]: *** [rts/builds/multithreaded/CMakeFiles/engine-multithreaded.dir/__/__/Map/SMF/Legacy/LegacyMeshDrawer.cpp.o] Error 1
make[1]: *** [rts/builds/multithreaded/CMakeFiles/engine-multithreaded.dir/all] Error 2
make: *** [all] Error 2

[jK]

My fault, also default builds fine (non GML).