noseman

why don't you constrain the Prism to the same spline with an Align to Spline and synchronize the motion using XPRESSO? https://www.dropbox.com/s/rujxxgvvj7tt7r0/aligned prism.c4d?dl=0

Thanks Hrvoje! Always my pleasure.

yes, this produces the same result. I did the whole thing in R21, which defaults to Remapping OFF for Volume Fields. The main thing is to understand: 1. what the data is: SDFs have negative non-normalized distance values inside the volume. 2. How to use the data: I want to create a "3D mask" (Field) from 0-1, where 1 is the selection I'm going to apply the Smoothing on. So I want the negative values to become 1 and the positive 0 (no selection). Therefore, first of all I need to negate the Volume Value, so that negative becomes positive. Then I need to apply "contrast" by compressing the distance values to 1 (range mapper is a "data contraster" and compresses the value gradient). You can do the same thing using remapping, or many other ways...

and a little bit from Jonathan Banks

Recently I pinned a reply on the Youtube Chat. If you're on R20, the Volume builder, by default, has remapping ON. You need to turn OFF remapping for the Volume Builder Field. R21 does that by default. I missed that difference in the original recording. Let me know if it worked.

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I think our difference is a philosophical one. Yes, Radians are measures of angles, and as such stand by themselves, but it is that way BECAUSE of Pi. If the ratio between the Radius and the Circumference was not the same for all circles, a consistent Radian couldn't exist, as it would express a different result for different Circles. Did I just up the Pedante?

I meant that in the sense that 2π radians is equal to 360 degrees. So for a full rotation of the wheel, we have 2 Pies... hence the pie is very tasty. Just in case I wasn't clear.

Doh... Note to myself: Hey noseman, it's because a Radian includes the Pi already... TWICE. That's why Radians are the default rotation unit... Thanks Jed...

All above solutions can work great, and here's my input: I'm using a Tracer Object, to trace a Cube (Turn Off Trace Vertices in the Tracer Attributes). This will generate a Spline and record the Cube's Trajectory (You can animate the cube by any means and I have chosen a Vibrate tag because I'm lazy). Then we use XPRESSO to read the length of the Tracer Spline, as it reflects the distance travelled. I use that as an input to a Range mapper that takes the Circumference of the Wheel (2*Pi*Radius), and maps that to one Radian (Negated because the wheel is going "the other way"). I then put that back into the Wheel P Rotation as Radians (Default Rotation Unit for XPRESSO). I also use an "Align to Spline" Tag to align the wheel to the end of the spline, and set it to Tangential so that it follows the Spline Tangent and orient itself. The Tracer offers the ability to create wheel tracks as well. Fun!!! Distance travelled 01A.c4d

Cineversity Live stream September 11th 2018 Tuesday September 11th, 1pm Eastern (10am Pacific), I'll be live online for an hour or two, to show off some Cinema 4D R20 tips and tricks, and answer user questions. Tune in on Cineversity YT channel: https://www.youtube.com/watch?v=Pr1hVkjuTJ0 Feel free to ask questions here and maybe I'll cover some of them…