HDR without shaders - It can be done the lamers way

**NecroDOME** · 08-10-2006, 01:42 PM

The use of HDR lighning without shaders. It's possible!

Since our engine still has no shader support I tryed to make a HDR test. So here is the result.

I still need to blur the image to the lighning is not so "cubic".

And some other results I from tweaking it:
http://necrodome.homeftp.net/zooi/hdr.jpg
http://necrodome.homeftp.net/zooi/HDR2.jpg
http://necrodome.homeftp.net/zooi/HDR3.jpg
http://necrodome.homeftp.net/zooi/Hdr4.jpg
http://necrodome.homeftp.net/zooi/hdroverkill.jpg

How it's done:
1. Render scene to texture (SceneTextre)
2. Render SceneTexture to a small texture (256x256) with some blending
- FDevice.SetRenderState(D3DRS_SRCBLEND, D3DBLEND_ZERO);
- FDevice.SetRenderState(D3DRS_DESTBLEND, D3DBLEND_SRCCOLOR);
3. Render the SceneTexture to the screen
4. Add the 256x256 texture to the screen

ps. Sorry for the BIG image

**JernejL** · 08-10-2006, 01:48 PM

i'm not sure you understand what HDR really is...

http://en.wikipedia.org/wiki/High_dy...ange_rendering

hdr is not blurring the final picture, it is very specific lightning effect, which tries to simulate human eye iris and eye adaptation to dark and bright light when passing from bright to dark regions and the other way round.

Say you are looking into dark from bright area, you will see it totally dark, when you come there the lightning will begin to equalise and you will see it more clearly.

**NecroDOME** · 08-10-2006, 01:58 PM

Well, it's not realy HDR, it's faked. But the result is nice.

**tanffn** · 08-10-2006, 02:25 PM

As Delfi said, its not HDR but it surly is a nice effect

How are you planning to handle the transition between normal render and the ‚Äòfake-HDR‚Äô render?

**Clootie** · 08-10-2006, 05:39 PM

Hm.., are you going to archive something alike Tron 2.0 rendering?
http://www.gamasutra.com/features/20...james_03.shtml

**grudzio** · 08-10-2006, 08:05 PM

So, is it possible to do HDR without shaders?

**WILL** · 08-10-2006, 08:38 PM

Originally Posted by NecroDOME

ps. Sorry for the BIG image

np.

Cool effect btw!

**tanffn** · 08-10-2006, 09:45 PM

Originally Posted by grudzio

So, is it possible to do HDR without shaders?

Why not?
Read Delfi's post.

Edit - I just remembered a few years ago I made a program that presented 12bit grayscale scan (NDT scanner we developed) to the screen (8 bit). With bias and gain you can ‚Äòpen‚Äô your intrest view => you have 12bit of data but only 8bit of data displayed.

Not your typical HDR in a sense that you might imagine it but HDR non the less.

**NecroDOME** · 08-10-2006, 10:29 PM

How are you planning to handle the transition between normal render and the ‚Äòfake-HDR‚Äô render?

I can only enable/disable it. No other settings can be changed. thats basicly it.

**NecroDOME** · 08-10-2006, 10:35 PM

Hm.., are you going to archive something alike Tron 2.0 rendering?

Well, I could do some glowing it I want. I can ajust the texture to some verry bright colors. That way it looks like its glowing. (not tryed it yet, but i'll think I do that soon)