Krakatoa realflow

[petkovic]

Hi Bobo,

i just tried something and would be nice if u could check, i have export some particles from houdini using realflow particle bin exporter and load them using prt loader inside maya, see the particles inside scene/viewport but when i hit the render nothing.

no matter what settings i change i get black render even in the alpha channel, let me know if u need files so i can upload them somewhere for testing

cheers

[Bobo]

One known problem with BIN files is that sometimes the “Density” channel stored by RealFlow contains 0.0, making the particles completely invisible in Krakatoa. The “Density” channel means something completely different in BIN files and we should probably ignore it, but we don’t I remember it came as 0.0 when resimming particles through a Hybrido grid, but there might be other cases too.

To check if that is the problem, you could either use the new Krakatoa Modifiers system to Set the Density channel to 1.0 on the PRT Loader itself, or just enable the Global Density Override and set it to 1.0 in the renderer settings. If the particles appear, then you will know it was the Density problem. If they don’t, take a look at the Maya Console to make sure the Particle Count is reported as > 0.

[petkovic]

Hi Bobo,

i wasnt expecting to see you on Sunday here hehe

your are right when i turn on the density particles has shown up

its a good thing you add that option, coz as i remember in previous build this option was missing

thx again & cheers

p.s.

there are some changes in krakatoa variable names (colorBG, overrideColor, etc…), i had a conflict with latest deadline6, wasnt a big probl i just modified the deadline submit script so its working now

[Bobo]

@petkovic

its a good thing you add that option, coz as i remember in previous build this option was missing

Here is the text from our internal bug report filed on Dec.21st.
You will see that when we added the Global Density Override, we were addressing exactly your problem

KMY: No Global Density Override

KMX has this, KMY does not.
In some cases, BIN files coming from RealFlow contain a Density channel with a value of 0. (Density means something else in RealFlow, and when moving particles through a grid, that channel can become zeroed out). Sometimes it could even end up in a PRT file saved by RealFlow.
These particles cannot be rendered at all in Krakatoa unless the Density is overwritten. Without Magma, the only way would be via a global override set to 1.
Alternatively, an option in the PRT Loader to set the Density to a user-defined value might be good too, and it would not require the overwriting of the Density of the whole scene.