Project Declension 2008 (Yes! Crepuscular rays)

[lostclimategames]

not bloom still but at least now it just looks a little more like antialiasing

[BlindSide]

No you should blur based on luminance, not everything at once! Right now you are lerping everything no matter how bright it is.

[jingquan]

Check this out again. Bloom + tonemap.

my formular:

Code: Select all

float4 color = sharp * 0.6 + blur * (0.5 * luminance(blur));
texCoord -= 0.5;
float vignette = 1 - dot(texCoord, texCoord);
color *= pow( vignette, 1.0 );
color *= expo;
return pow(color, 1.05);

[BlindSide]

Does your RTT match the screen resolution? There appears to be some major aliasing...

[jingquan]

No, I used 1024x512 instead instead of 1024x768 so it'll take less memory.

[Dorth]

It shows atrociously. Use 1024*1024. If you need memory that badly, bloom isn't for you anyway.

[jingquan]

Obviously, Irrlicht doesn't allow me to render at 1024x1024 when my testing resolution is at 1024x768. I could up it to suit my desktop's or tv's and use unlimited shader instructions, but that isn't widely supported by many people.

Oh well, maybe I should render at 1280x1024.

http://www.orandysoftware.com/user_file ... clarge.jpg

[hybrid]

With OpenGL it should allow for that, the DX driver will get an update to make this possible, too. The patch is already available (if you want to try it, it's at the SF patch tracker). Will be in the next release.

[BlindSide]

Infact, the patch is only needed for creation of a bigger (Z buffer? I think), so in this case it is irrelevant as he needs the size to be the same as the device resolution, and there is already a backbuffer big enough for that. All he needs to do is remove the pow2 check from RTT texture creation in the DX9 drivers, its a 2 second procedure.

(Or you could just use OpenGL)

[lostclimategames]

what I dont understand is why you insist on bluring the whole thing, thats not how bloom works at all.

[Saturn]

Indeed. Don't blur the resulting image. Blur the (downscaled) luminance map before application to the final image. Single pass blur effects always look like this. Instead use a multipass technique with separate thresholded luminance map and image

[jingquan]

I would like to try the patch, but I'm using IrrCP.

Anyway, if this next one isn't bloom, then it's ugly bloom. I did bloom+blur+tonemap+highpass and downsampled to 512x512. I think the color bleed is a little too much. BTW, I'll work on calculating the scene luminance, realtime. Right now, too much of the bright areas are 'bloomed', and if I reduce it, the contrast isn't right.

http://www.orandysoftware.com/user_file ... _bloom.jpg

Thanks for your help.

EDIT*

A little tweak, and I didn't downsample anything.

http://www.orandysoftware.com/user_file ... om1024.jpg

Probably the best I think. EDIT** Not!

[jingquan]

Yeah! Got the final bloom done. No more unnecessary blurring except at bright areas. I reduced the bloomed textures to 1/4 of my orginal for color bleeding.

Now I see unblurred images are alot nicer. I had them posting in my website (below). Check them out!

Now, I'll work on sampling the luminance for the brightpass.

[lostclimategames]

much better.

[jingquan]

I know why my bloom looks ugly now. The texel alignments are all wrong, which the rtt texture will shift towards the lower right corner. I've a luminance sample to adjust the brightness. Not yet HDR but it's getting close. Here's two screendumps, the first looking from a dark area will have any lightsource brighter. Moving towards it will lower the luminance.





OK. I'm wondering how I can go about doing the eye adaption, which is just smoothing out the transition of brightening/darkening.

THanks.