Polys?

[xid]

What increases poly size, or should i say what slows down the map? Is it the size of the rooms, number of entities ect...?

[randall]

The size of the room can make a difference. Make it too big and the BSP will divide it into smaller chunks.<br><br>Use r_drawflat to see the different polys your map is subdivided into (use only in WinQuake, NOT glQuake). You'll notice it looks NOTHING like what you drew in the editor.<br><br>Entities can also slow down a map. I placed a couple guns in a small area, and lost about 1 FPS. I don't know if this is because of the increased polycount, or the animated moodel.

[Moose or Chuck]

Each textured brush is divided, depending on where the texture ends. You see, vis has to cut each brush up, so if your texture is something like 16x16 and your brush is 16x16x16 then you'd have 6 polies, the 6 sizes of the cube. But if you have a brush that's 32x32x32 then you'd have anywhere from 12 polies to 24 polies, depending on how well the textures are aligned to the brush. So texture's cut up the brushes to create more polies if you're not careful<br>Also, any brush that intersects another brush will cut up the intersected brush, making that many more polies, depending on the number of sides of the poly that intersected the intersected poly. So that could also increase the poly size by a whole lot. So you'd want to keep simple detail oriented things 1 unit off of other polies. But things like columns and walls and doors don't need to be 1 unit off.<br>Models and entities DO increase the poly count, but in a different way, which doesn't slow down the system as much, but still makes a difference.

[999]

Yea, what he said.<br>

[randall]

I think you are thinking of Quake 2 Moose.<br><br>With Quake, textured surfaces that are identical will be merged into a single, larger surface. It will try to merge them into the largest possible surface (something a little less than 256x256). So even if you used a 64x64 texture on a 256x256 wall, it would be merged into 4 polys. Although if you used the exact same 64x64 texture on a 224x224 wall, it would be merged into ONE poly.<br><br>Here are some figures to ponder:<br><br>64x64 texture on 300x300 wall = 4 polys<br>64x64 texture on 256x256 wall = 4 polys<br>64x64 texture on 224x224 wall = 1 poly<br>64x64 texture on 160x160 wall = 1 poly<br><br>64x64 texture on 256x224 wall = 2 poly<br><br>This gets even more screwy and complicated when you start cutting doorways and windows into a wall. BSP will merge textures wherever it can, sometimes resulting in way higher polycount than you had anticipated.

[Moose or Chuck]

Thanks randall for pointin out a slight difference. But 999 believes me.

[999]

Goose, how do you know who I was referring to? <br>

[randall]

It's not a slight difference. It's a big difference.<br><br>Also, when discussing polycount, The number of sides on a brush don't matter, because of backface culling. Only the exposed surface (that the player can see) matter.<br><br>With a perfect cube, the maximum number of sides the player can see at any given time is 3. So the other sides don't matter in the current view, and aren't calculated.<br><br>Last modification: randall - 07/02/01 at 14:45:28

[Moose or Chuck]

I realise that you can only see 3 sides of a cube at once, thanks.<br>Ok, why does it matter anymore. The guy has the info he wanted. Why do we always have to bitch at each other, fuking everyone over? Let's just let it slide this time.<br>Last modification: Moose Master - 07/02/01 at 15:13:16

[jongjungbu]

Slide? Did you like that Goo Goo Dolls song. oh wait..it wasnt in japanese.

[randall]

ROFL ROFL ROFL

[Moose or Chuck]

well, they do have a Japanese album.<br><br>Ya, I did like that song actually. But that was, what, 3 years ago?

[jongjungbu]

What does the 3 years matter though. Unless you were a different person (or gender) at that time? Heh.<br><br>Edit: Dang smileys.<br>Last modification: JongJungBu - 07/02/01 at 16:54:14

[Moose or Chuck]

Ya, a 13 year old likes much different things than a 16 year old. So ya, I'm pretty sure I was a different person back then.