subtracting volumes in pyro explosion for flipbook

[blendingshadow]

Hey,

 

I am looking for a way to subtract the volume data from a pyro explosion so I can layer it an engine later via flip books.

 

I want to render out a flip book with the smoke and fire in different elements and or passes. 

 

The smoke will need to sit on top of the explosion, the issue I am having is the alpha?

 

Would cutting the volume in half work? If so how would you do that? Are there rendering trips for depth that you can utilise it in post?

 

Thanks

 

 

[blendingshadow]

 

The last part where the information is extracted look like it would work really well.

 

How would you achieve this?

[Diego A Grimaldi]

Those are renders, not flipbooks!!

 

Doing a flipbook means you are doing a viewport playblack of a sim, not a render

[blendingshadow]

Yep, but I can cut them out after and make some flipbooks from the data.

 

Looking for the same technique used to extract the information that's seen at the end of the video

[rbowden]

The last part of the video is just the aov's you get get the pyro shader already (smoke mask, fire mask, etc). The others are just simple RGB lighting. If you have a sim already and are unsure about how to deal with aov's in houdini, here is a video to get you started:

https://vimeo.com/98484834

Once you have an understanding how it works, put down a pyro shader and go inside it. Inside you should see some nodes labeled export_smoke_color, export_fire_color, etc. Those are what getting exported from the shader and what you have to add to your mantra ROP.

-Ryan

 

[pbarua]

Fetch fields from DOPs by Dop I/O. If you are fetching multiple field at a time then use blast to isolate. Then use VolumeVisualization SOP to visualize the way you want to see it in flipbook.