Blurry reflections - possible?

motorsep · **Posted:** Wed Jun 27, 2012 6:32 pm

Is there a way to achieve blurry reflections with stock Doom 3 similar to this:

http://assets2.ignimgs.com/2010/06/16/s ... 239902.jpg

solarsplace · **Posted:** Wed Jun 27, 2012 9:31 pm

Hi

That sort of effect is absolutely possible in the standard IDTech4 engine. You will need some custom materials and the effect is quite performance expensive.

Here is a screen shot from an example I just created to show you the effect.

http://imageshack.us/photo/my-images/44 ... 0046s.jpg/

Thanks

motorsep · **Posted:** Wed Jun 27, 2012 9:38 pm

Cool. How exactly did you do that (with samples, if you can) ? Thanks.

The Happy Friar · **Posted:** Thu Jun 28, 2012 12:38 am

this might help: http://www.sterlingshield.net/home/stev ... uly05.html

motorsep · **Posted:** Thu Jun 28, 2012 12:49 am

Thanks, I will check it out!

solarsplace · **Posted:** Thu Jun 28, 2012 9:48 am

Hi

Also check out these links for more info:

http://www.modwiki.net/wiki/How_to_add_water

Watch out for this issue too. The only solution is to make the single player MD5 have a no-draw & solid material applied its meshes. If you just use no-draw then projectiles will go straight through your player. This technique rules out use in multi player though: viewtopic.php?t=23594

In the picture I posted there is also a blur layer too just above the reflection.

Cheers

motorsep · **Posted:** Thu Jun 28, 2012 4:44 pm

The questions is what is "blur layer" and how that one is done?

Sikkpin · **Joined:** Thu Aug 19, 2004 7:22 pm **Posts:** 1129

You don't need to add another surface to act as a "blur layer" but simply pass the mirror render (which defaults to "_scratch" texture) to a blur shader in another stage in the same material. Here's a shader I did for mth that does probably something like what you're looking for: viewtopic.php?p=224908#p224908

whitewolf · **Joined:** Sat Jun 28, 2008 2:17 pm **Posts:** 350

Your all overthinking this. All you really want is regular material with spec etc. and a cubemap stage. Thats how it was done in the original pic. mirrorrender is too expensive unless you really need it.

I'll dig one up tomorrow.

Sikkpin · **Joined:** Thu Aug 19, 2004 7:22 pm **Posts:** 1129

^Not to mention, buggy and incomplete.

gavavva · **Joined:** Sun Jul 13, 2008 1:24 pm **Posts:** 392

Not quite... I believe the effect is real time (or zoned cube maps with real time models updated in the reflection). When rendered at a low resolution, they appear blurred regardless and then with a fresnel term can look as in the first pic. Reflections are cheap enough anyway when rendered at low resolutions, and clearly here they are only on simple geometry.

BloodRayne · **Posted:** Thu Jun 28, 2012 6:03 pm

This works perfectly.

I use a reflection map on one layer using mirror.
Then I add another decal 1 unit above it with a heathaze shader, this works beautifully and in real-time.

chimueloeldragon2011 · **Joined:** Mon Jul 18, 2011 5:58 am **Posts:** 193

I think I came late, but I've setup a reflection mtr file some time ago for a project I never finished. It renders in real time but as said above it's performance expensive. It's cool when used with clean metalic/ceramic or other flat surfaces. I attach 2 screens I took from my testmap and then the code. If you want to use it create a mtr file called 'reflection.mtr'

http://img850.imageshack.us/img850/5818/reflec1.jpg

http://img254.imageshack.us/img254/3926/reflec2.jpg

Code:

textures/common/reflection
 {
   noSelfShadow
   noshadows
   translucent
   nonsolid
   noimpact

   qer_editorimage textures/common/reflection
   {
      mirrorRenderMap 512 512
      blend blend
      alpha 0.1
      translate 0.5, 0.5
      scale 0.5, 0.5
   }
}

create a simple patch mesh and assign the common/reflection texture
you'll see a black texture in the editor unless you create a reflection.tga image yourself, but it works.
Hope this helped anyway

motorsep · **Posted:** Thu Jun 28, 2012 7:45 pm

Neat stuff.

But there is no blur in the screenshots you posted, chimueloeldragon2011

Also I am wondering if there is a way to mix cubemap reflections with real reflection? For example the static world would be as cubemap reflection and certain entities (player, AI, projectiles, moving lights) would be reflected real-time. If it's possible, wouldn't it be faster than have real-time reflection of everything ?

chimueloeldragon2011 · **Joined:** Mon Jul 18, 2011 5:58 am **Posts:** 193

Yeah I know

Sorry about that.
However decreasing the resolution of the reflection makes the images more blury, but it looks terrible, so that's not going to help I guess... Besides it doesn't eat that much performance.

Sikkpin · **Joined:** Thu Aug 19, 2004 7:22 pm **Posts:** 1129

motorsep wrote:

...Also I am wondering if there is a way to mix cubemap reflections with real reflection? For example the static world would be as cubemap reflection and certain entities (player, AI, projectiles, moving lights) would be reflected real-time. If it's possible, wouldn't it be faster than have real-time reflection of everything ?

You can suppress render entities from mirror renders but you can't mix cubemaps and mirrors. I mean, you can, but visually, it wouldn't work.

motorsep · **Posted:** Thu Jun 28, 2012 10:03 pm

What do you mean by "visually it wouldn't work" ?

motorsep · **Posted:** Thu Jun 28, 2012 10:05 pm

chimueloeldragon2011 wrote:

Yeah I know

Sorry about that.
However decreasing the resolution of the reflection makes the images more blury, but it looks terrible, so that's not going to help I guess... Besides it doesn't eat that much performance.

It's cool, no problem. I am just still trying to get someone to show how the actual blurring of real time reflections is done. The reflections itself seems to be easy, but the blurring ....

Sikkpin · **Joined:** Thu Aug 19, 2004 7:22 pm **Posts:** 1129

Here's an example material for a reflective water that uses the mirror render. You can't use this directly but it should give you an idea how to setup the material.

Code:

textures/liquids/water_mirror 
{
   // discrete
   // nonsolid
   // twosided
   // water
   translucent
   // noFragment
   noShadows
   // noOverlays
   qer_editorimage textures/liquids/water.tga

   {
      blend      blend
      mirrorRenderMap    128 64
      translate   0.5, 0.5
      scale      0.5, 0.5
      // maskDepth
      program      liquid_mirror.vfp
      fragmentParm   0       time * 0.05, time * 0.1, time * 0.05 + 0.2, time * 0.1 + 0.1   // texture scrolling
      fragmentParm   1      5.0, 0.5, 0.5         // fresnel power, bias, 1 - bias
      fragmentParm   2      0.1, 0.15            // refraction distortion scale, reflection distortion scale
      fragmentParm   3      0.5, 0.75, 0.85         // refraction color
      fragmentParm   4      1.0, 1.0, 1.0         // reflection color
      fragmentParm   5      0.00390625, 1         // depth fade, fade constrast
      fragmentParm   6      0.001953125, 0.00390625   // mirror texcoord (inverse mirrorRenderMap size)
      fragmentMap      0      _mirrorRender         // reflection map
      fragmentMap      1       _currentRender         // refraction map
      fragmentMap      2       _currentDepth         // depth map
      fragmentMap      3      textures/liquids/waves1.tga   // normalmap
      // vertexColor
   }
}

motorsep · **Posted:** Thu Jun 28, 2012 10:57 pm

And that water has no issues when player is in it? (reflection scaling)

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Blurry reflections - possible?

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