Beyond3D Forum

LittlePenny · 14-Jul-2002, 19:56

In the August issue of Game Developer Magazine they had a nice article about Scattered light. The physics they used to implement this was kindof roundabout, but I was wondering if a few of you with DX8 capable cards could give me your thoughts on the demo?

http://www.gdmag.com/code.htm It is the aug02.zip.

I was wondering what kind of performance it would get and if it could be coupled with pvrdev's demo on shadows from an infinite light source.

Anyhow, thanks.

demalion · 14-Jul-2002, 23:50

Looks beautiful, and very smooth.

It is locked at about 40 fps according to fraps 1.8A. My screen is at 1280x1024x32@85Hz and the applicable draw space in the window looks like about 960x480 or something (too lazy to get a pixel position reporting tool at the moment). Note that using Alt+Enter to go to full screen resulted in a banded, distorted image that looks like a partial section of what I saw in windowed mode, and the fraps reading dropped to 30, so it doesn't seem to be working properly for me.

I would be very pleased with a game with graphics like that...looks MUCH better than any flight simulator I've seen, even with a farily blocky terrain (the lighting effects help disguise the blockiness even fairly close up), though things like nice looking water and building/vehicle shadows would likely be a fair additional performance load on the GPU.

I think Morrowind may use some similar principles in its graphics, so I guess pixel shaders aren't just limited to the water in that game...but that is just a layman's guess.

Mummy · 14-Jul-2002, 23:56

The sun "glow" in Morrowind doesnt need PS as it works without them enabled as well.

Only water is using PS (sigh).

BoardBonobo · 15-Jul-2002, 00:00

I agree, it looks pretty good. The framerate was locked at 34fps for me both at full screen (640x480) and in a window. I would guess it CPU limited as alot of the calculations would have to be done off card. I think the banding results from it using a 16bit display.

The way the cloud reflections move across the scenery is v.realistic. Neat!

SlmDnk · 15-Jul-2002, 12:52

Very beautiful and realistic demo. I had the same problems in full-screen as you ppl. Hope to see this used in games soon...

OpenGL guy · 15-Jul-2002, 23:47

I haven't checked out the above-mentioned demo yet, but have you seen this one?
http://www.ati.com/developer/gdc/GDC...anPreetham.pdf

Runs great on my 8500.

LittlePenny · 16-Jul-2002, 00:35

Quote:

Originally Posted by OpenGL guy

I haven't checked out the above-mentioned demo yet, but have you seen this one?
http://www.ati.com/developer/gdc/GDC...anPreetham.pdf

Runs great on my 8500.

Same people, so I would assume this demo is the same. To be fair I think your PDF was published before I found that article

. I will have to make a trip to campus before attempting to download that 60+ PDF. Thanks for sharing though, I am sure this 60+ pager will be more fulfilling than the 4 page article.

OpenGL guy · 16-Jul-2002, 00:44

Quote:

Originally Posted by LittlePenny

Same people, so I would assume this demo is the same. To be fair I think your PDF was published before I found that article

. I will have to make a trip to campus before attempting to download that 60+ PDF. Thanks for sharing though, I am sure this 60+ pager will be more fulfilling than the 4 page article.

Yeah, I think the link I gave is to the .pdf used at the GDC presentation a couple months back. When I saw the demo running in-house, I was quite impressed

Dave B(TotalVR) · 16-Jul-2002, 14:38

GROAN, all these ppl running DX 8 demos ;(

Come on PowerVR come out with a DX 8 CARD!!!

14-Jul-2002, 19:56	#1
LittlePenny Member Join Date: Feb 2002 Location: Rolla, Missouri, USA Posts: 276	Demo on Outdoor scattered light. In the August issue of Game Developer Magazine they had a nice article about Scattered light. The physics they used to implement this was kindof roundabout, but I was wondering if a few of you with DX8 capable cards could give me your thoughts on the demo? http://www.gdmag.com/code.htm It is the aug02.zip. I was wondering what kind of performance it would get and if it could be coupled with pvrdev's demo on shadows from an infinite light source. Anyhow, thanks.

15-Jul-2002, 00:00	#4
BoardBonobo Senior Moment Join Date: May 2002 Location: SurfMonkey's Cluster... Posts: 1,813	I agree, it looks pretty good. The framerate was locked at 34fps for me both at full screen (640x480) and in a window. I would guess it CPU limited as alot of the calculations would have to be done off card. I think the banding results from it using a 16bit display. The way the cloud reflections move across the scenery is v.realistic. Neat! __________________ "We're a virus with shoes" - Bill Hicks "The fact that a believer is happier than a sceptic is no more to the point than the fact that a drunken man is happier than a sober one. " — George Bernard Shaw "The Tree of Life is Self-Pruning" - The Darwin Awards

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14-Jul-2002, 23:50	#2
demalion Senior Member Join Date: Feb 2002 Location: CT Posts: 2,024	Looks beautiful, and very smooth. It is locked at about 40 fps according to fraps 1.8A. My screen is at 1280x1024x32@85Hz and the applicable draw space in the window looks like about 960x480 or something (too lazy to get a pixel position reporting tool at the moment). Note that using Alt+Enter to go to full screen resulted in a banded, distorted image that looks like a partial section of what I saw in windowed mode, and the fraps reading dropped to 30, so it doesn't seem to be working properly for me. I would be very pleased with a game with graphics like that...looks MUCH better than any flight simulator I've seen, even with a farily blocky terrain (the lighting effects help disguise the blockiness even fairly close up), though things like nice looking water and building/vehicle shadows would likely be a fair additional performance load on the GPU. I think Morrowind may use some similar principles in its graphics, so I guess pixel shaders aren't just limited to the water in that game...but that is just a layman's guess.

14-Jul-2002, 23:56	#3
Mummy Member Join Date: Jun 2002 Location: Vault Thirteen Posts: 266	The sun "glow" in Morrowind doesnt need PS as it works without them enabled as well. Only water is using PS (sigh).

15-Jul-2002, 12:52	#5
SlmDnk Member Join Date: Feb 2002 Posts: 497	Very beautiful and realistic demo. I had the same problems in full-screen as you ppl. Hope to see this used in games soon...

15-Jul-2002, 23:47	#6
OpenGL guy Senior Member Join Date: Feb 2002 Posts: 2,291	I haven't checked out the above-mentioned demo yet, but have you seen this one? http://www.ati.com/developer/gdc/GDC...anPreetham.pdf Runs great on my 8500.

16-Jul-2002, 14:38	#9
Dave B(TotalVR) Member Join Date: Feb 2002 Location: Essex, UK (not far from IMGTEC:) Posts: 491	GROAN, all these ppl running DX 8 demos ;( Come on PowerVR come out with a DX 8 CARD!!!

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