Houdini MaterialX - custom volume shader

for more houdini training kindly visit
www.rohandalvi.net/

[@artadecram_9624]

That was cool - as you know karma has no Ambient Occusion shader - potentially - is it possible to write such a shader?

[@HoudinifxAlfredosanmartin]

Thank you Rohan for teaching, I really like learning from you, you are very intelligent and I really like your work : )

[@VISHNU.S_143]

how to add intensity ramp on pyro shader in karma xpu like pyrobake volume intensity ramp

[@pubudu781]

Great tutorial Rohan!! i'm trying to build shaders for fluid stuff with material x, is it possible to setup specular for white water with this ? by using the gradient values ?

[@syntheticperson]

Excellent tutorial. Thanks!

[@walabe8]

You're a legend!

[@syntheticperson]

The way absorption works is that it subtracts the color you select from the light passing through the volume. e.g. if you set the absorption color to pure red, then only the green and blue passes through. So you end up with a cyan volume.

[@rohandalvi]

Thanks for the explanation. That make sense now.

[@serialvision]

great tutorial!!!

[@vivincentable]

Amazing! thx!!

[@nick-boson3590]

great tutorial, but I can't get this method to work with a standard bonfire.

[@VISHNU.S_143]

how to add intensity ramp on pyro shader in karma xpu like pyrobake volume intensity ramp

[@pavinivfx]

Sidefx have a problem with their updates that I hate the most: You can`t even follow a tutorial, because They simply want to change everything in the next patch. I think it is possible to upgrade something without changing dramatically things.

[@9AFilms]

Hey man everything works but the fire is not casting any light on the smoke, any solution?

[@rohandalvi]

It could be an issue with the ray depth. Try increasing the volume ray depth in the karma settings.

[@krishnanunnib4546]

When white light falls on an object, every stuff in the world absorbs certain wavelengths from it and reflects the rest. For example, plants absorb certain wavelengths and reflect the rest, which falls on to our eyes, and we perceive it as the color complimentary to the absorbed one, i.e., green. I think i am correct. Pls do fact check.😅 Think its called absorption spectrum.

[@szymonsniegocki528]

Hmm, kma_volume is supported by xpu

[@rohandalvi]

I thought it wasn't. I'll try it out. Thanks for letting me know

[@szymonsniegocki528]

@@rohandalvi the only thing you have to make before, is coverting to vdb using pyro post process sop

[@rohandalvi]

@@szymonsniegocki528 so it didn't support the standard volume it only supports vdb.

[@GuardianCompositing]

dont work on Houdini 19.5.534

[@dddmod6596]

in order to simply assign a material for rendering in karma, do you need to assemble a combination of 8 nodes? oh my god.. Who are these developers doing this for? for three Houdini fans or for themselves? Despite all the coolness of Houdini, these guys clearly have some problems understanding what the user needs...

[@tomallen5837]

because this setup method still works but it is outdated. You can now use the karma pyro material or the karma pyro preview (also somewhat outdated) for XPU rendering, just as long as your volumes are vdbs. Don't forget your bake volume on the sop side, as well the pyro post process.

[@karimoh3154]

@@tomallen5837 glad I read this!