Help with Lava and Mixing Shaders

This topic has 15 replies, 4 voices, and was last updated 3 years, 11 months ago by Jonathan Lampel.

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September 19, 2022 at 5:24 pm #15414
neishy
Participant
Hi

I’m struggling mixing my lava shader with the base rock principled bsdf shader.

The lava is not responding to the cracks. It doesn’t look like the lava is emanating from the rocks.

Let me work out how to add a photo on my phone so I can show you what’s happening.

I’d appreciate any help, thanks. Or even seeing someone’s file so I can work out how to improve.

I’ve basically followed the procedual dirt video’s way of structuring the nodes with the node frames. I am happy with it to an extent, though I could always improve.
September 19, 2022 at 5:25 pm #75379
neishy
Participant
September 19, 2022 at 5:28 pm #75380
neishy
Participant
September 19, 2022 at 6:14 pm #75381
Martin Bergwerf
Participant
Hi @neishy ,

I’d need to see the complete Shader Node Tree, but your Mix Shader just uses a constant Factor to mix between Lava and Rock.

You’d want to use a ‘Cracks Mask’ as the Factor, so the Mix Shader knows where to put Lava and where to put Rocks.

Basically (and don’t use these exact Nodes, they are just to show how to use a ‘Mask’):
September 19, 2022 at 8:43 pm #75382
neishy
Participant
I see. Thanks for the advice. Let me send a phot of the full node tree.
September 19, 2022 at 8:46 pm #75383
neishy
Participant
I guess what wasn’t really explained was how to create this emission effect. It’s proving quite challenging for me.
September 20, 2022 at 2:50 am #75384
Martin Bergwerf
Participant
Sorry, the photo isn’t helping, I can’t read that; a proper screenshot of the Shader Editor would be needed there…

If using 3.0 +:

And yes, it is supposed to challenging…that way you learn a lot more and better.
September 20, 2022 at 5:58 am #75385
neishy
Participant
Ok I will do, currently I have no internet, so no way of getting uploading a screenshot. Let me try again a big later. Thanks
September 20, 2022 at 7:31 am #75386
Omar Domenech
Participant
Hmmm, maybe this will be one of those times where we’re going to need the file to take a look around and troubleshoot. It’s kinda hard to figure out what’s going on with only screenshots. But lets see what happens.
September 20, 2022 at 8:47 am #75387
neishy
Participant
Ok. I’ll upload some screenshots in a sec. If you also need the file, I can upload it here as well, though I’m not exactly sure how. Thanks for the support by the way — I really appreciate it!
September 20, 2022 at 8:58 am #75388
neishy
Participant
September 20, 2022 at 8:58 am #75389
neishy
Participant
September 20, 2022 at 8:58 am #75390
neishy
Participant
September 20, 2022 at 9:03 am #75391
neishy
Participant
I’ve had to upload the node tree in 3 photos as it’s quite long. I’ve posted them in order, starting from left of the node tree.

One solution I’ve thought of is copying the node frame called ‘Cracks’ and linking it with the factor of the emission shader’s Colour Ramp, so the lava only appears where the cracks are. Could this work?
September 20, 2022 at 10:41 am #75392
Martin Bergwerf
Participant
Hi neishy, no need to copy the Node Frame, but I’d try to use the Output of one of those Multiply Nodes (of those Cracks) and plug it into the Factor of the Mix Shader, You might need a Colorramp or Map Range Node in between, to control the values.

You can of course try your idea and see what happens. It’s always good to experiment a bit, but if that doesn’t give you the resul;t you want, try my suggestion.
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