Refraction in glass material?

by thojoh370 on 05/23/2010 17:01, 12 messages, last message: 07/10/2010 13:43, 1890 views, last view: 04/07/2024 13:05

Hi there people.

First of all, yes I'm back. I'm not going to surrender to you guys, not by a long shot...

Now to my question/topic/suggestion/whatever. While I know the water(falls) refracts and mirrors and all that... why doesn't the glass material also do that? As far as I know, that material is just transparent with some very weak coloring added to it.

Bottom line is:
Is it possible to manipulate the "glass" material so that it refracts/reflects just like the water material - in order to have it look more like real glass (and quite frankly, more like other games)?

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#1: ..

by Quin on 05/23/2010 17:46

Not in realtime, you can "reflect world" however by using envmaps.

http://sauerbraten.org/docs/editref.html#_envmap_

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#2: ..

by thojoh370 on 05/23/2010 21:54

But.. aren't the water effects rendered in realtime?

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#3: Re: ..

by Quin on 05/24/2010 00:15, refers to #2

You'll notice that water is used sparingly (only 1 or 2 reflection planes per level) and is only able to reflect along the z-axis.

The cost of real-time reflections along multiple planes and areas is too high for what Cube tries to achieve (scalability) and hence won't be added.

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#4: ..

by Pieter on 05/24/2010 18:46

I think Thojoh's question has to do with refraction, not reflection.

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#5: Re: ..

by Razgriz on 05/24/2010 19:23, refers to #4

there is no reason to add refraction to glass since glass material has no special shape for it to refract the environment.

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#6: Re: ..

by |ice|sub-zero|L on 05/25/2010 00:10, refers to #5

unless of course someone made it possible to change the shape of glass..... but good luck.

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#7: Re: ..

by Quin on 05/25/2010 02:10, refers to #6

Alpha blend material in SVN lets you do this to geometry, texture it like glass, then control its opacity.

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#8: Re: ..

by Q009 on 05/25/2010 07:48, refers to #7

yep
and thats even better because you can combine bumpmap with envmap to make glass look more realistic

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#9: ..

by thojoh370 on 07/10/2010 00:35

Yeah, well if you look at this screenshot..
http://www.freakygaming.com/gallery/action_games/f.e.a.r./creepy_little_girl.jpg

It isn\'t very clear, but what you see through the windows behind Alma is distorted, while what you see through the doorway isn\'t. That is the kind of effect I was thinking of, but semi-transparent textures might work aswell as long as it still looks like glass.

Also, is it possible to bend clip/glass/noclip etc. yet?

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#10: Re: ..

by SheeEttin on 07/10/2010 00:56

> Also, is it possible to bend clip/glass/noclip etc. yet?

From Quin's post, just two above yours...

> Alpha blend material in SVN lets you do this to geometry, texture it like glass,
> then control its opacity.

As for distortion: I don't know. Probably possible with a custom shader.

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#11: Re: ..

by |ice|sub-zero|L on 07/10/2010 05:38, refers to #10

to put it in English for those kinds that need to learn that google is a big help... this means that the "cube"/"material" with alpha blend allows you to make the "cube" to change more or less clear, meaning of course that you make your "clip" with (if i have it right) "cube" or "glass" with "cube" if you add envmapping.

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#12: Re: ..

by Razgriz on 07/10/2010 13:43, refers to #11

not much sense in your reply sub-zero :P

Alpha material reduced the opacity of a cube, allowing to make glass-like shapes, and textures that use the *envworld* shader setup will be able to use envmap to reflect the world like a glass would.

now if you want to make invinsible cubes, there is pretty much no need for alpha, since using /skytexture 0 and covering your object on all sides with it will make it invisible to common view.

though alpha allows for something more, as you can use both normal skytexture and geometry that you make invinsible with a more detailed setup of alpha material.

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