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High dynamic range lighting and lightning
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High dynamic range lighting and lightning // New Users
Post by weaveribm // Feb 28, 2007, 1:18am
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weaveribm
Total Posts: 592
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I'm trying to create lightning flashing outside a window seen from the interior, I know that one frame is the limiting shortest flash-time
I can't figure out how to do this so far, I'm using a light outside the window and above pointing away from the window and a large white cube/wall that I raise up to reflect the light into the window - and fiddling about :) but this must be re-inventing the wheel, is there a standard way to simulate lightning/explosion flashes please?
I'm upgrading to 7 so I know HDMI is in there which will help, a very intense 1-3 frames flash would be good
I need to build an exterior to reflect the flash I suppose but just an intense couple-of-frames flash as seen from the interior (interior is quite dark to maximise contrast) is what I'm after. A very big light yes :) (and narrow-beam searchlights to follow, wartime scene)
TIA
Peter |
Post by Bobbins // Feb 28, 2007, 1:58am
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Bobbins
Total Posts: 506
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Pointing a light away from the outside of the window and trying to reflect it off a surface is not going to work in tS6.6 as LightWorks cannot do GI and therefore cannot bounce the light back into the scene. All you'd see is a bright white outside the window while the room stayed dimly lit. You could run a Radiosity solution but it would probably not be worth it.
Why not just place an omni light or lights inside the scene and keyframe them to maximum intensity for a frame or two, then key a white plane to move across the outside of the window at the same time?
It might just be easier to render the animation, then fake the lightning in post: bring it into your video editing program and increase the brightness/contrast for the relevant frame or two. That's how I'd do it and combined with a suitable timed thunder sound fx it would work.
P.S. tS7 has HDRI, HDMI is something else entirely! |
Post by Chester Desmond // Feb 28, 2007, 5:07am
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Chester Desmond
Total Posts: 323
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I did a quick test with decent results for the time spent. One IBL light which I keyframed to flicker and then keyframed the background color between black and white on the same keyframes as the light brightened\dimmed.
The room is simply a hollow cube with a camera inside and the IBL (which is surrounding the cube with its environment disabled) lights the interior quite well as long as shadows are disabled. |
Post by weaveribm // Feb 28, 2007, 7:04am
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weaveribm
Total Posts: 592
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All you'd see is a bright white outside the window while the room stayed dimly lit
Thanks both!
Exactly so Bobbins yes, will look at post-processing ta.
P.S. tS7 has HDRI, HDMI is something else entirely!
Quite right, I was thinking of our glorious Sony Bravia :)
keyframed the background color between black and white
Nice one CD hmm so there are creative solutions then, I hadn't thought of cheating by animating colours other than the light
I've just had a quick look at 7.11...
Aaaaggghh! :)
The TS learning curve just went exponential. With me at the wrong end of the curve. The pointy end :)
Peter |
Post by weaveribm // Mar 2, 2007, 1:50am
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weaveribm
Total Posts: 592
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After watching the HDRI videos I'm wondering if one can create HDRI images within the application by using HDRL high dynamic range Lighting which I think is in 7.11
Or if HDR images are created in a special way and we have to take what we can get if we can find suitable background images?
Interesting how HDR images are described as not just images with the contrast cranked up but that there is 'more information' in a high dynamic range image than in a standard image
Games that have HDR lighting are around and of course they must be creating 60 HDR Images per second
The panoramic HDR images in there are created by stitching together images from a standard camera are they? Like the function on some digital cameras for creating panoramic images?
Peter |
Post by weaveribm // Mar 8, 2007, 12:47am
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weaveribm
Total Posts: 592
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P.S. tS7 has HDRI, HDMI is something else entirely!
Looking forward to playing with it now I'm on 7.11 Bobbins thanks
I'd now like to light my little set (with a dark interior) so that sunlight is very bright and HDR-ed
The outside view is to an avi running on a simple plane object - back projection
How to implement HDRL can anyone give me some pointers please?
I've looked at HDRI via the courses and HDRI sites, very interesting. That type of lighting looks good but for speed is it possible to implement an HDR lighting scheme please?
HDRI images it's PIN number all over again. PI number :)
Peter |
Post by Chester Desmond // Mar 8, 2007, 3:15am
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Chester Desmond
Total Posts: 323
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time to call the Department of Redundancy Dept. |
Post by weaveribm // Mar 8, 2007, 4:13am
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weaveribm
Total Posts: 592
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Sounds interesting Chester tell me more please?
No teasing the new kids mind or you might get a reputation for being er, offhand and/or dismissive? We all started out as new kids remember :)
TIA
Peter |
Post by Chester Desmond // Mar 8, 2007, 4:35am
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Chester Desmond
Total Posts: 323
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I was just making a joke based on your statement:
HDRI images it's PIN number all over again. PI number |
Post by weaveribm // Mar 8, 2007, 4:49am
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weaveribm
Total Posts: 592
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Sorry mate I was ready for PI number/3.14159 jokes but not that one :)
Ah I thought you might mean that HDRL is redundant or something Chester so mass panic in the ranks here plus I'd just read James and his take on the old retainers - not knowing yet who are the haze-the-new-kids people he's talking about. Not you obviously, cheers bruv
Peter |
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