Hello, New here so apologize in advance but I have searched the forum and watched as many tutorials as I can find to not ask a redundant question… I am simulating a fire growing from a fuel tank on a vehicle that encompasses the entire vehicle. I am working with a fire expert so the results need t…

I have been doing some testing and have found that to paint where fire will emit on the geometry the discharge map transitions work out better sharp edged, black to white with very little or no feathering of gray-scale. I was using black and white maps to contrast but stumbled upon another problem.…

i played a bit with the discharge map, to check that everything is ok. well, i think i found the reason for the confusion, the discharge map is working, but it’s hard to make difference between the gray and white zones. actually the discharge affects only the velocity of the outgoing fire, it’s hard…

I’ve been referencing this video: https://www.youtube.com/watch?v=CaRLRA\_azFc Currently I need to slow down the velocity of the outgoing fire so the smoke doesn’t carry as much of the inertia. I’ve got the fire to a near believable height and the flames and smoke emitting more realistically, but…

well, if you need to decrease the outgoing velocity, just decrease the global discharge. the source uses both the map and the discharge parameter, the local discharge is the product of the map brightness and the discharge value. the result is set as velocity, the direction is the geometry normal. to…

That’s what I’ve been finding in testing, reducing the map output and the global discharge. I had to increase the decimal precision in 3ds Max just to be able to get the values reduced enough to get acceptable results. I’m working in feet units.

this sounds strange, feet unit is pretty good, is not miles or kilometers to need so small value of the discharge. the discharge value means speed, a normal fire has speed about few feets per second so this must be the proper value.

Discharge Map

V-Ray V-Ray Common Public

Ivaylo_Katev October 23, 2014, 6:26am 2

no, the discharge is not pure on/off, it accepts gray scale. can we see some render results, in the most cases one picture worth a thousand of words

An assortment of OSL shaders for your perusal

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discharge maps on liquid source. General	1	104	March 27, 2015
Emitting from a animated texture map. deriving colour from map also. Public	4	193	October 23, 2014
Speed map General	2	125	June 10, 2015
Emitting from texture Public	10	247	February 5, 2015
Restrictions on how to map source? Issues	9	238	March 19, 2019

Discharge Map

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