Humus - Comments

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Query FailedNeoKenobi
Monday, August 2, 2004

Looks like a cool event to me. Btw. How do you think about Microsoft's XNA?

Graham
Sunday, August 1, 2004

I thought you might be interested, but I gave this technique a try in my own code... And the results were fairly interesting...

I mostly use a Q3 bsp loader to test the lighting system... The lighting itself is fairly simple, per-pixel with specular, with very heavily optimized stencil-shadows. No fancy things like paralax.

I was expecting a measurable speed boost. I only managed this in one case...

in chiroptera, I managed to get a boost of around 15% when in a random coner looking at a wall with my spotlight.. but this was the only case.
In every other place in the map, I'd get a slight performance hit...

On a small simple map with no normal lights (just spotlight) I could break even, but not see a boost..

And on my mega-test, running nv15, the extra triangles required really hurt things.. Standing at the far coner, with nearly 300 lights on screen, with stencil-shadows, the polygon count was around 2 million for the scene... using this technique it jumps another half million triangles, which naturally cut the frame rate by about a third. (radeon 9500p, 640x480 -> ~6fps goes down to ~4fps)

so I'm wondering, in this demo, for each light do you simply render the entire scene again? I can understand this giving a noticable perforamnce boost, but it would seem in a real world case, where there is already a lot of culling going on the extra triangles simply shift the bottleneck...

*however*
if I were to pull out my old paralax shaders, (which used 5 layers

- then there might be a noticable difference.. Just I don't know if I still have them since it's been over a year since I scrapped them since they were too slow...

Anywho

still is a nice demo

have fun.

Humus
Saturday, July 31, 2004

Meltdown is Microsoft's developer event.
https://secure.lenos.com/lenos/microsoft/meltdown2004/

NitroGL
Saturday, July 31, 2004

Meeeh, DirectX...

NeoKenobi
Saturday, July 31, 2004

What kind of event is Meltdown exactly?

TaskForce_Reivax
Friday, July 30, 2004

Greetings Humus, I've got a GeForce FX 5200 (VS & PS 2.0) but the demo doesn't run quite right.
The shadow on the walls keeps shimmering on and off. Do you know why this might be happening?

Thanks.

Humus
Friday, July 30, 2004

Possibly. Try running it at stock speed and see if the problem goes away.

udha
Tuesday, July 27, 2004

I find that the demo crashes after running for a while, i think less than 10 mins, would that be from my mild overclock?


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