BSP trees

Graphics and GPU Programming Programming

Started by Dwiel January 30, 2002 07:43 PM

3 comments, last by Dwiel 22 years, 2 months ago

365

Author

January 30, 2002 07:43 PM

If I create a BSP tree, and want to draw each face from front to back (thats what a bsp tree will help with right?), do I have to make a billion DrawIndexedPrimitive() calls, because that seems like it would just slow it down even more, or do you change the order of vertex buffer, or what? I just dont seem to understand how you instruct D3D what order you wnat it to draw your faces, and change that order frequently. Thanx alot Zach Dwiel ~ Tazzeld

Dwiel

amish1234

104

January 30, 2002 07:56 PM

I just made a map system. The vertices are grouped together by the texture they use. This minimizes DrawPrimitive() and SetTexture() calls. I will soon implement BSP so I only have to render what I see.

Proceeding on a brutal rampage is the obvious choice.

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Dwiel

365

Author

January 31, 2002 02:30 PM

I guess what I really meant was HOW do I display may BSP tree? A BSP tree sorts the faces in order from closest to farthest or farthest to front, but my question how do I tell DX the order I want it to display them.

Thanx alot.

I never seem to explain things well.

Try again me.

Dwiel

jesterlecodeur

122

January 31, 2002 03:38 PM

quote:Original post by Tazzel3D
If I create a BSP tree, and want to draw each face from front to back (thats what a bsp tree will help with right?), do I have to make a billion DrawIndexedPrimitive() calls, because that seems like it would just slow it down even more, or do you change the order of vertex buffer, or what? I just dont seem to understand how you instruct D3D what order you wnat it to draw your faces, and change that order frequently.

Thanx alot

Zach Dwiel ~ Tazzeld

You can order your VB/IB, but if your render frond to back (or any order) you need to change texture too often, and the recent GPU don''t like this way. Consider, rendering by texture and enable z-buffer, use just pvs culling if your bsp have any.

_______________
Jester, studient programmerThe Jester Home in French

Dwiel

365

Author

January 31, 2002 06:05 PM

Ohhhhhhhhhhhhhhh.... I seeeeeeee. Thanx alot. One question still. Then what are BSP trees good for. And I have heard of the pvs culling, but what exactly is it and where could I get some info on it??

Thanx alot.

P.S.

I am looking in the article section right now so, well, yeah hopefully there should be some pvs stuff there

Dwiel

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