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I was following a tutorial (https://www.youtube.com/watch?v=29yfS-icS3M&t=564s&ab_channel=Iridesium) on explosions in blender but i've run into a few problems. I followed it pretty much exactly, though he does go a bit fast so I may have missed a thing or two. Around 15:03 after he does the initial baking he selects a frame and goes into rendered view before adjusting the shaders, and his smoke already looks like how it should, just without the colors. However when I enter rendered view after baking, all I see is a cube of smoke filling the entire domain, rather than a frame from the explosion. Basically like how volumetric fog looks in eevee.

Also earlier when he's in solid view he turns on color mapping to see the smoke better, and it makes his smoke white, but when i do it I see a bunch of separated black globs. When I turn off color mapping I don't even see anything at all

He's on 2.82.7 and i'm on 2.9 but unless they've completely changed the way smoke sims work i don't think that is the problem.

What it should look like: enter image description here

What I got: enter image description here

Material nodes: enter image description here

Blend File: https://drive.google.com/file/d/147q_6xxkBdWAqRlkRWM8qnoQfSP_ELbx/view?usp=sharing

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  • $\begingroup$ Please edit your question to include images of what you're describing - instead of relying on someone downloading your Blend file. This makes the question more accessible to others so that they can see the problem and associated solution. Also, use blend-exchange.giantcowfilms.com to share your blend file instead of other sites to ensure it remains accessible (it's the 'official' place to upload blend files for this site). $\endgroup$
    – Rich Sedman
    Commented Sep 29, 2020 at 10:36
  • $\begingroup$ I know about giantcow, site was down yesterday when i was trying to post this. Will add some images $\endgroup$
    – Mark C
    Commented Sep 30, 2020 at 7:58
  • $\begingroup$ Add an image of the material nodes for the smoke domain $\endgroup$
    – susu
    Commented Sep 30, 2020 at 9:05
  • $\begingroup$ I highly doubt that is making the difference, because mine already looks different before we add any material at all, but i've added it. Basically just a default principled volume node. $\endgroup$
    – Mark C
    Commented Sep 30, 2020 at 13:23
  • $\begingroup$ That's the problem. Which instructions did you follow that just added a Principled Volume as the material? Have you done any research how one shades smoke in Blender?` $\endgroup$
    – Leander
    Commented Sep 30, 2020 at 13:31

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You need to tell the Principled Volume node where to get it's measure of the 'density' of the domain from. You can do this by either feeding a value into the 'Density' socket or you can fill in the 'Density Attribute' to indicate it should be taken from the smoke domain 'density' attribute.

In your case you should be able to simply click on the 'Density Attribute' field and enter 'density' (all lower case).

principled volume density attribute

Changing the 'Density' value (just above the Density Attribute) will adjust overall density of the smoke (it acts as a multiplier).

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  • $\begingroup$ This helped me find the problem. In the tutorial I was watching the guy deleted the density attribute and adds a volume info with a colorRamp and math node, hence why I had nothing in that box. Only thing is when I added the volume info I forgot to use the density instead of the color output. $\endgroup$
    – Mark C
    Commented Sep 30, 2020 at 16:51

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