Krakatoa Splash (Particles ain't rendering)

Deprecated Krakatoa 1.0 Beta Discussion
1

I made splash particles with krakota to use in glacier collapse animation which i am making for cgtalk’s fxwars challange.

here is the movie : http://www.jhjariwala.com/krakatoa_splashmist.mov



Now i thought to use krakatoa to another scene in which i had display units set to “meters”.

and i m trying to render particles with krakatoa.but there isn’t rendering anything. it does calculates pflow setup but nothing comes in rendering. I have attached max version 9 file.



http://www.jhjariwala.com <— WebSite

2

I made splash particles with

krakota to use in glacier

collapse animation which i am

making for cgtalk’s fxwars

challange.

here is the movie :

http://www.jhjariwala.com/krak

atoa_splashmist.mov



Now i thought to use krakatoa

to another scene in which i

had display units set to

“meters”.

and i m trying to render

particles with krakatoa.but

there isn’t rendering

anything. it does calculates

pflow setup but nothing comes

in rendering. I have attached

max version 9 file.





Not A Bug (but it really cries for an addition to the documentation! :o)



You are rendering in Volumetric Density Mode. In this mode, the density is calculated, well, volumetrically. Krakatoa takes into account the amount of particles per VOLUME, so rendering 1000 or 10 million particles in the SAME VOLUME would look about the same. As long as the volume is constant and the particle count is variable, the resulting density will appear more or less constant.



But, if you use a MUCH LARGER VOLUME (as you do), the values entered in per particle density also have to go up to account for the larger volume to be shaded. In short, you are filling a volume of 5,4 BILLION CUBIC INCHES with 800 particles, thus the density per particle is very very low (you can still detect low color values in the VFB, but they are almost invisible).



Increasing the Per Particle Density to about 1.0*10^3 (enter 1.0 and 3 in the two fields!) will scale the density up and you will start seeing your particles as expected.



Btw, the User Units settings (meters) have no effect on the rendering, the System Units do have effect. Your iceberg is 1770x2745x4482 generic units which equal to the same amount of inches. If you had modeled your iceberg with 1GU = 1 meter instead of 1 inch, the total size of the object would be much smaller in generic units and Krakatoa would have shaded better with lower density settings.



Hope this explains it.

3

Thanks bobo for explanation. it clears all my doubts. yes increasing density to 1*10^3 started showing particles in rendering.



http://www.jhjariwala.com <— WebSite