How to fake fire flames

The Twilight Render Team shares tips, ideas, helpful hints, and more on using Twilight Render
TSPCo
Posts: 66
Joined: Thu Jan 12, 2012 1:48 am

Re: How to fake fire flames

Post by TSPCo » Mon Mar 05, 2012 3:49 am

I tried this technique, works well. Now how could it be done, where the flame is more than 2D?
I don't think projecting the image on a cylinder would work, of course it would have to be lit from inside. I tried a radial array, the results did not look right. In the meantime, here is my contribution to the concept. A hexagonal fireplace surrounded by 300 degree, seating area.
firepit.jpg
firepit.jpg (31.88 KiB) Viewed 10500 times

Fletch
Posts: 12897
Joined: Fri Mar 20, 2009 2:41 pm
OS: PC 64bit
SketchUp: 2016-2023
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Re: How to fake fire flames

Post by Fletch » Mon Mar 05, 2012 4:38 pm

TSPCo wrote:...where the flame is more than 2D?
Model your flame any shape you like, and apply the texture.

longtrip68
Posts: 22
Joined: Sun Dec 14, 2014 4:02 am

Re: How to fake fire flames

Post by longtrip68 » Mon Dec 22, 2014 12:30 pm

I am having trouble getting good results. I have followed the instructions as described at the beginning of this post. I found a nice flame with black background, imported into Photoshop, used a mask to remove background, leaving a nice slightly transparent flame. Saved that as a PNG. Imported into SU as image. Place a Point Light inside fireplace (orangish in color) and rendered.

The flames do not light up, glow, reflect, or otherwise appear lit at all.

In the rendered image below, a single "fire place" light is the only source of light. You can see it is putting out a glow from the fire place, but the flames are not really lit up.

I also included a screen shot of the SU model. There is a point light at the base of the fire as well, but I had in disabled for the render.
Fire_test.jpg
Fire_test.jpg (114.19 KiB) Viewed 9808 times
Screen Shot 2014-12-22 at 4.43.41 PM.png
Screen Shot 2014-12-22 at 4.43.41 PM.png (129.39 KiB) Viewed 9808 times
Thanks for the help,

Dane

longtrip68
Posts: 22
Joined: Sun Dec 14, 2014 4:02 am

Re: How to fake fire flames

Post by longtrip68 » Mon Dec 22, 2014 1:51 pm

I think I figured it out. I had the Point light on the same plane as the flame image. So, I offset the point lights. That made a big difference. Let me know if you have any other tips.
Fire_test.jpg
Fire_test.jpg (124.43 KiB) Viewed 9808 times
Btw, I have two images of the flames, each perpendicular to each other to give a more 3D effect from any angle. Seems to work. Or what about the "face camera" option for only one image??

Thanks again,

Dane

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