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Light flare question...
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Light flare question... // Archive: Tech Forum
Post by Birdnest // May 20, 2006, 1:22pm
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Birdnest
Total Posts: 152
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Ummm..I know I've seen this done before.
How exactly do you achieve light flare effects on materials like metal, glass, reflectant objects, water. etc.?? You know like somewhat of a glow effect/illuminating effect. Can Vray paform that task? (I currently own Ts6.6) 'Cause I can't seem to see that kind of an effect done with TS6.6.
Take this image for example >>http://69.41.236.26/gallery/anonymus.jpg
Notice the somewhat glow shining off thee statue object from light illumination.
Can something like this be done with TS6.6? or is this just a photoshop trick? |
Post by Bobbins // May 20, 2006, 8:31pm
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Bobbins
Total Posts: 506
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In tS6.6 it's easiest to do this in post using a paint package.
In tS7 the Player realtime renderer can do blooms and glows with the ability to save to file. |
Post by nick // May 20, 2006, 11:49pm
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nick
Total Posts: 49
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Erghmm... see this:
http://www.caligari.com/products/trueSpace/ts5/Plugins/Caligari/rayPak/default.asp?Cate=Caligari
Virtuaout and VirtuaLight for trueSpace 6.6 is the one you need. |
Post by GraySho // May 21, 2006, 2:48am
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GraySho
Total Posts: 695
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Richard Rosenman has created some excellent plugins for Photoshop (also works with Paintshop Pro). Check out the diffuse glow plugin.
http://www.richardrosenman.com/software/downloads/ |
Post by Birdnest // May 21, 2006, 12:05pm
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Birdnest
Total Posts: 152
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Erghmm... see this:
http://www.caligari.com/products/trueSpace/ts5/Plugins/Caligari/rayPak/default.asp?Cate=Caligari
Virtuaout and VirtuaLight for trueSpace 6.6 is the one you need.
I already own that plugin, and to be honest.....it sucks lol. It won't allow to achieve what I want to achieve. I've done some experimental plugins and I'm not happy with the results. I've tried some trai lan error, and still can't seem
to get the nice caustic, diffuse glow type of results. |
Post by TomG // May 22, 2006, 6:13am
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TomG
Total Posts: 3397
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Hi,
As far as I know, all true glows and blooms are post-process - this is because they are not bound to a material surface, and so are the result of processing the final rendered image, and do not get calculated during render.
One quick note, you said "to get the nice caustic, diffuse glow type of results."
Note that caustics are caused by glass or metal objects reflecting or refracting rays of light to cause patterns of focused light on surrounding objects. This is not the same thing as the glow or bloom effect, which is entirely different.
There is a glow shader plugin in the Coolpowers series (it works by identifying the shader as requiring post process - so although a material is painted on, this just singles out which objects are to be post-processed and which not, and the glow effect remains post-process).
I wrote a "bloom" shader in ShaderLab, which is simulated and which changes the specular highlight (a common area for glows and blooms to occur), but the glow does not leave the surface of the object of course (can't, since it isn't post-process). Although the highlight effect is quite nice, it is not like the image you show :) http://www.tmgcgart.com/ShaderLab/html/shader_listing_1.htm#Bloom
The image you show is definitely post-processed. Even if done in a 3D package "at render time" it will be a post-process shader or effect applied after the render engine has "done its thing"
So a Photoshop plugin should work just fine, as in essence it is doing the same thing as anything else and modifying the image once it has been rendered based on those areas which are particularly bright (as far as I know - unless there are issues of occlusion and things handled in some post-process glow / bloom effects?)
BTW, this effect is achievable in real-time in tS7. Real-time glow is quite common in games etc now, and can be done on the graphics card hardware (again, it is a post-process pass to the image, once the 3D has all been rendered - so it's even post process when in hardware ;) )
HTH!
Tom |
Post by frank // May 22, 2006, 11:23am
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frank
Total Posts: 709
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Birdnest: There's an old industry trick (not that I'm in "the industry" but I do know about it)...and I don't really like the name of this trick, so I won't repeat it....but anyhow, it works like this:
(Photoshop, After Effects, or other apps that support layers and blend modes)
Layer 2 (top): duplicated original render with Overlay blend mode and gaussian blur applied
Layer 1 (bottom): Original Render
It gives an overall diffuse effect so for the isolated blooms, it may not be quite what you're after. Still, give it a shot - you may like it. |
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