How to fake fire flames

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Ecuadorian
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How to fake fire flames

Post by Ecuadorian » Wed Sep 09, 2009 5:41 pm

To fake fire flames in Twilight:

1 take a picture of a flame lowering your camera exposure so the background appears black (or just look up some photos of flames with black backgrounds in Google).

2 Open in GIMP, right click on your layer, select Add layer mask and choose the option to use a greyscale copy of the layer as the layer mask.
GIMP-mask.jpg
GIMP-mask.jpg (25.19 KiB) Viewed 18256 times
3 Save as PNG and ignore the warning.

4 Import the PNG as an image (not as a texture) into SU and position it.

5 Place a point light in front of it and make it any color you like according to the type of flame (I used yellow-orange). It should look like this:
fire-SU.jpg
fire-SU.jpg (19.38 KiB) Viewed 18253 times
A render with preset 02, made in 16 seconds. I turned off the sun and made the sky color a bluish grey.
Preset02-16seconds.jpg
Preset02-16seconds.jpg (26.63 KiB) Viewed 18257 times

Ecuadorian
Posts: 1779
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Re: How to fake fire flames

Post by Ecuadorian » Wed Sep 09, 2009 5:47 pm

And the SKP file in SU7 format.

Feel free to play around, but be careful when taking your own fire photos.
Attachments
fire.skp
(676.24 KiB) Downloaded 1005 times

Fletch
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Re: How to fake fire flames

Post by Fletch » Wed Sep 09, 2009 6:16 pm

Ecuadorian wrote:... be careful when taking your own fire photos.
:lol: looks pretty good!

Solo
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Re: How to fake fire flames

Post by Solo » Wed Sep 09, 2009 7:48 pm

Here are some flames with alpha info embedded, created with 'Particle illusion'.
flame1.png
flame1.png (70.68 KiB) Viewed 18228 times
flame 2.png
flame 2.png (77.95 KiB) Viewed 18223 times
Crop as needed.

Ecuadorian
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Re: How to fake fire flames

Post by Ecuadorian » Wed Sep 09, 2009 8:56 pm

Thank you for sharing! :)

EarthMover
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Re: How to fake fire flames

Post by EarthMover » Thu Sep 10, 2009 12:01 am

Cool tutorial Miguel...thanks!

xrok1
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Re: How to fake fire flames

Post by xrok1 » Thu Sep 10, 2009 2:33 am

what settings does twilight use when no settings are selected?
Capture.JPG
Capture.JPG (53.11 KiB) Viewed 18422 times
it seems to me this is the effect i would expect (darkness all around), but as soon as a preset is selected the scene lights up even though the only light source is the point light in the flames?????

fymoro
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Re: How to fake fire flames

Post by fymoro » Thu Sep 10, 2009 5:18 pm

wow !!! very cool thanks ;)
Cheers, Fred.
http://www.fredericmoro.com
Interior scene tutorial on Sketchup Artist http://www.sketchupartists.org/tutorial ... ht-render/

Chris
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Re: How to fake fire flames

Post by Chris » Thu Sep 10, 2009 5:39 pm

xrok1 wrote:what settings does twilight use when no settings are selected?
it seems to me this is the effect i would expect (darkness all around), but as soon as a preset is selected the scene lights up even though the only light source is the point light in the flames?????
It is supposed to use "Low", but it appears that when you are opening a scene from another computer, where paths are different, it defaults to a bare-bones ray-tracer. That's something I'll have to fix. Anyway, to get more or less the same look, make sure sky is black background color. That should help.

xrok1
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Re: How to fake fire flames

Post by xrok1 » Fri Sep 11, 2009 2:28 am

????????
light seems to go through the pot.

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