Ok, with variance shadow mapping:
Click
without:
Click
What's going on? Relevant code is within those images.
When I turn on filtering, then I get these ugly staircase patterns.
Ok, I am looking at your fx composer code, and you have this:
float lit_factor = (rescaled_dist_to_light <= moments.x);
What does this do? Doesn't that assign a float to a bool? Or does that assign 1.0 or 0.0 depending on the value of the bool?
[Edited by - solinent on November 16, 2008 12:51:55 PM]
Shadow mapping help
Quote:
Ok, with variance shadow mapping:
Click
Don't know whats going on but one advice - when testing shadows always check how it looks with standard dot(L, N) shading :)
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Cool! It's a good school :)
Wish I could be there but it's about one-half equator's distance from my home :P
Author
Yeah, there was a problem with how I was computing the shading, and it's almost fixed now (still some weird artifacts on the car, but I'll fix them later).
I'm trying to do a gaussian blur, but it seems that the algorithm isn't as easy as I thought it'd be, so I guess I'll be doing it another day. But I can apply custom glsl filters to my shadow maps now, and applying filters is doing something, so I think I'll eventually get it.
I'm trying to do a gaussian blur, but it seems that the algorithm isn't as easy as I thought it'd be, so I guess I'll be doing it another day. But I can apply custom glsl filters to my shadow maps now, and applying filters is doing something, so I think I'll eventually get it.
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I'm trying to do a gaussian blur, but it seems that the algorithm isn't as easy as I thought it'd be
Yeah, I guess blurring is the most time-consuming part of this algorithm. However, even though it is much more efficient than PCF. Besides, a really good-looking sun shadows are worth that :)
Author
Just updating my progress: I got VSM to work nicely, and gaussian blur works as well!
I think I might just put off PSSM until I can get my hands on a nice race-track environment or make one of my own, because there's no point until then.
edit
I think I know why I have weird artifacts on my stuff, it's a precision problem.
For the brief second before my simulator blows up (due to large rendering times: I'm perplexed) when I use RGBA16, the artifacts go away.
But why is RGBA16 so slow? RGBA12 doesn't seem to make any improvement.
[Edited by - solinent on November 17, 2008 8:35:58 PM]
I think I might just put off PSSM until I can get my hands on a nice race-track environment or make one of my own, because there's no point until then.
edit
I think I know why I have weird artifacts on my stuff, it's a precision problem.
For the brief second before my simulator blows up (due to large rendering times: I'm perplexed) when I use RGBA16, the artifacts go away.
But why is RGBA16 so slow? RGBA12 doesn't seem to make any improvement.
[Edited by - solinent on November 17, 2008 8:35:58 PM]
Quote:
Just updating my progress: I got VSM to work nicely, and gaussian blur works as well!
How about light-bleeding? Did you use any helper technique to avoid this problem?
Author
My environment so far only consists of one object, and I haven't implemented PSSM (right now the light's position and direction is calculated at an offset to the car based on the drection of the light).
I'll probably get light bleeding when I add more things, but I'll cross that bridge when it comes.
Or will it help the precision issues I'm having?
I'll probably get light bleeding when I add more things, but I'll cross that bridge when it comes.
Or will it help the precision issues I'm having?
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