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Maximum VB size?

Started by SoaringTortoise Feb 17, 2003 at 2:57 PM 6 replies 400+ views

Original Post

Feb 17, 2003 at 2:57 PM

What exactly is the maximum Vertex Buffer size that you can create. In the SDK it talks about the max number of vertices you can draw in a single drawprimitive call, but there''s no mention of the vertex buffer limit (or at least, none that I can find). I only ask because I''m getting creation errors with non-specific descriptions trying to create anything with more than about 420,000 polygons in it (very approximate calc). Learning to fly is easy, but as a tortoise, the landings are really rough.

Moh_Abed

Feb 17, 2003 at 3:34 PM

i think tha max number is 65,000. at least in my card.

Donavon Keithley

Feb 17, 2003 at 10:51 PM

The biggest size you can create is the size just before it fails.

There is no hard limit -- well, up to 2^32-1. If you think it''s failing because of size, try something smaller -- like 1024 -- and you''ll have your answer.

SoaringTortoise

Feb 17, 2003 at 11:47 PM

Yah, if I create a height map with 200x200 height entries it loads fine(200x200=40,000 vertices, but I do a lot of tessellation for lighting reasons. Plus, I only render sub-sets of the VB... i.e. do my view culling, so it's not a problem with the rendering). If I go over this (to 250x250) it fails, but in a spectacular way that requires rebooting. I don't really want to have to revert back to using multiple VB's because I already (after some serious re-work) switched from multiple VB's to a single VB for performance reasons.

Learning to fly is easy, but as a tortoise, the landings are really rough.

[edited by - SoaringTortoise on February 17, 2003 12:50:54 AM]

Muhammad Haggag

Feb 17, 2003 at 11:53 PM

VB size is limited by memory only.
Yet, when rendering, you''d have to make sure to conform to the limitations posed by the card (i.e. MaxVertices and such)

Cheers,
Muhammad Haggag

SoaringTortoise

Feb 18, 2003 at 12:00 AM

That''s what I thought, but I''ve got a GeForce4 4600 128mb card and 512 mb ram so... It''s most likely something else, eh?

Learning to fly is easy, but as a tortoise, the landings are really rough.

Donavon Keithley

Feb 18, 2003 at 12:18 AM

How many bytes are you requesting when it fails?

Could it be that you''re filling up video memory with textures beforehand and there''s not enough room left for the vertices?

SoaringTortoise

Feb 18, 2003 at 12:35 AM

Hmmm. A good thought, but I''m loading +/- 40mb of textures directly to the video card, the rest are all poolmanaged.

Learning to fly is easy, but as a tortoise, the landings are really rough.

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