octree, dyanmic index buffers, slower

Chaucer · 2003-03-18T17:33:01

I''m finally able to fill my dyanmic index buffers correctly and it''s still too slow. Here''s how it works: Loading Stage: 1. Generate vertices and put into 1 big vertex buffer 2. Create an index buffer for each texture group that is the size of all the indices for that texture group. 3. Split up into 8 nodes. Each node has an array of indices for each texture. Rendering Stage: 1. For each node, check to see if it''s visible and go to #2 2. For each texture group in node, lock index buffer and copy (if indexptr=0 discard, else append) indices from node into the index buffer for that texture group (see loading stage#2). Unlock index buffer. 3. For each texture group, render index buffer for that texture group. This is actually much slower than my previous way of just creating and index buffer for each texture group in each node and rendering one at a time. I guess memcpy calls are slower than drawindexedprimitive. Is there any other way to get this faster?

Graphics and GPU Programming Programming

Started by Chaucer March 16, 2003 01:44 PM

10 comments, last by Chaucer 21 years, 1 month ago

Chaucer

122

Author

March 18, 2003 10:12 AM

I was still hoping that you could confirm that it's good to create octree nodes with 21k triangles if there are 7 texture groups.

Another thing I should point out is that I'm using triangle lists. I dont see how I could use strips or fans since the texture groups are placed randomly. Do you have any ideas for that?

[edited by - Chaucer on March 18, 2003 11:14:06 AM]

Thanks!

GalaxyQuest

122

March 18, 2003 05:33 PM

Could someone elaborate on how you are ''suppose'' to copy indices if not by memcopy, I sorely hate all the ''dont do this'' without a suggestion on what to do.

octree, dyanmic index buffers, slower

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octree, dyanmic index buffers, slower

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