holographic material

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neo0.
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holographic material

Post by neo0. » Sat Jun 28, 2008 8:45 am

Somethign like this
Image
Image
Basically, a material that is somewhat transparent and glows..

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Borgleader
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Post by Borgleader » Sat Jun 28, 2008 8:53 am

Hmm that would be interesting. I'm guessing an emitter, blended with a transparent with an IOR of 1. or something as such.

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ZYX
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Post by ZYX » Sat Jun 28, 2008 8:55 am

emitters can be blended?

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Borgleader
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Post by Borgleader » Sat Jun 28, 2008 8:55 am

ZYX wrote:emmiters can be blended?
i dont know, maybe? im noob, i was just speculating.

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dougal2
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Post by dougal2 » Sat Jun 28, 2008 10:39 am

emitters cannot be blended, they're not materials.

You should be able to get transparent anything by blending with the null material.
As for glowing, I think you'd have to use some clever lighting, and add bloom/glare in post.

SimonLarsen
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Post by SimonLarsen » Sat Jun 28, 2008 10:51 am

If it has to be glowing, I think the best thing to do is, to do it in postpro.
You could do a render with a textured emitter, and one without. And blend them.

Or just do a render without the hologram, and photoshop it in afterwards.

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CTZn
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Post by CTZn » Sat Jun 28, 2008 11:24 am

Now what about a wireframe shader :roll: sorry I'm a bit sarcastic right now... ok voxels with nice interpolation would work better here my two cents, better holographic look because borders not too sharp unlike surface wich is sharp sharp sharp
obsolete asset

neo0.
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Post by neo0. » Wed Jan 14, 2009 12:40 pm

How about something a little simpler.. A color display embedded in glass?
http://www.youtube.com/watch?v=jPauljzA ... re=related

Another example of a hologram is attached. If a new material type is needed (say "transparent glow" or something) then I think it would make a valuable addition.
Attachments
yp.jpg
yp.jpg (132.33 KiB) Viewed 7551 times

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CTZn
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Post by CTZn » Wed Jan 14, 2009 7:42 pm

An holographic material looks like this:

Code: Select all

<medium>
	<name>blinn1_medium</name>
	<precedence>6</precedence>
	<basic>
		<ior>1</ior>
		<cauchy_b_coeff>0</cauchy_b_coeff>
		<absorption_coefficient_spectrum>
				<rgb>
					<rgb>0 0 0</rgb>
					<gamma>2.200000048</gamma>
				</rgb>
		</absorption_coefficient_spectrum>
	</basic>
</medium>

<material>
	<name>blinn1SG</name>
	<specular>
		<transparent>true</transparent>
		<internal_medium_name>blinn1_medium</internal_medium_name>
		
		<texture>
			<uv_set>default</uv_set>
			<path>C:\work\3d\Indigo\dev\shaderV2\hologram.png</path>
			<exponent>2.2</exponent>
			<b>1</b>
		</texture>
		
		<base_emission>
			<constant>
				<rgb>
					<rgb>5000000 5000000 5000000</rgb>
					<gamma>1</gamma>
				</rgb>
			</constant> 
		</base_emission>
		
		<emission> 
			<texture>
				<texture_index>0</texture_index>
			</texture>
      </emission> 
      
	</specular>
</material>
the screen is totally invisible (it does not interact with light), even not casting shadows. Only the light it is emiting is visible. As such it's also the perfect candidate for laser beams.

edit: I'm insisting on the fact that, as a specular, this material will only work on closed meshes (volumes). Here I'm using a shrinked cube, it's no plane.
Attachments
hologram.jpg
screen is a thin sheet (volume)
hologram.jpg (33.35 KiB) Viewed 7534 times
Last edited by CTZn on Sun Jan 18, 2009 8:27 am, edited 2 times in total.

neo0.
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Post by neo0. » Thu Jan 15, 2009 8:15 am

Looks great ctzn! Im gonna see if I can use this with skindigo.

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CTZn
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Post by CTZn » Mon Jan 19, 2009 1:01 am

After you asked for the same thing again otherwhere I suppose you could not, did you ? This is the topic where you should have continued on...

I have myself written this shader by hand, the Maya to Indigo exporter is being reworked to export such materials out of the box (ie without string replacement, really by exporting material parameters).

I don't think you have asked in the SKIndigo forum on that matter, sorry neo0. but what is your head at ? If you can't use raw xml please stick with your exporter forum.

If I was admin, this would be a warning, sanctioned by the destruction of this thread without further comments.

Lucky you, that's just me.

neo0.
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Post by neo0. » Mon Jan 19, 2009 9:17 am

Would it be possible to create a colored holo material..? See attachedd
Attachments
reex.jpg
reex.jpg (143.58 KiB) Viewed 7420 times

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PureSpider
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Post by PureSpider » Mon Jan 19, 2009 9:24 am

:roll:
Nothing more to say... that is just unbeliveable...

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CTZn
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Post by CTZn » Mon Jan 19, 2009 9:32 am

I will follow up soon on this, wanting to do a better image than above (edit: referring to mine, of course :)).

The material will be the very same, so the answer is "yes it would", if I am correct.
Last edited by CTZn on Mon Jan 19, 2009 10:09 am, edited 1 time in total.

neo0.
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Post by neo0. » Mon Jan 19, 2009 9:59 am

Instead of using an texture, could could theoretically just use geometry apply the mat to it, right? I mean, I think thats what they did in those CG movies that I took the pics from.

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