However, if you are working with rather regular numbers with few decimal positions or zeros, you are free to set Exponent to 0 and enter the value in the left (base) Final Pass Density value.if you want to enter a million, instead of typing base 1000000 and Exponent 0 (since 10^0=1), you can enter 1 and Exponent 6. You will notice that the Exponent slider goes from -8 to +8, but the value field itself accepts values from -32 to +32, so you can create values with up to 32 zeros BEHIND the base value! E.g. So if your particles were saved with a very very low per-particle Density channel in the PRT file, and you need to boost the render-time value via the Final Pass Density, you need to be able to scale with values > 1.0. In the case of X-Particles, it happens to be the default 1.0, but you could modify it via a, say, Gradient Tag to change over time, or based on Velocity Magnitude, etc. As you probably know, in Krakatoa every particle can come with its own per-particle Density value. The Final Pass Density is in fact a scene-wide scale value.You can see some fragments and a whole blog about the experience here: /news/20 … /7bpf.html To get a smooth result, we needed to scale down the per-particle Density to 1.0E-9 - entering that value directly wouldn’t have worked. Why would you want to do that? Well, back in 2011 we took a big machine with 256 GB of RAM and rendered 7 billion points to see what would happen. In fact, that is the reason Krakatoa in all its incarnations (3ds Max, Maya, C4D, Stand-Alone) uses this complex notation - in most of those applications, you cannot really enter a value like 0.0000000000000001 - the value field would simply round it down to 0.0! But you can enter 1.0 Exponent -16 and get this value easily. Your explanation was quite wonderful, but I have to point out that the Density value is not in the range from 0.0 to 1.0 as you claimed, but rather from 10^-32 to 10^32.However, I figured I would comment here instead of your YouTube channel to clarify some things:įinal Pass Density and Exponent I watched just part 2 since it is about Krakatoa, and I must say it is brilliant! You explained all the basics in a simple and very accessible way.