Andi Farhall

Andi Farhall

About Me

United Kingdom


Recent Forum Posts

Local variables, driving parameters and documentation June 11, 2022, 6:17 a.m.

9 times out of 10 the answer to my questions have been pointed out in the documentation. However...

Quite often I want drive a parameter with an attribute, good example being painting a point attribute to drive the height on a mountain sop, which you can do by naming the incoming point attribute @height. It isn't mentioned in the docs at all as far as I can see but why this works becomes clear if you dive inside the mountain sop attribvop and find a bind that imports @height, and I can also see all the other things that are bound in which is helpful.

Now I want to drive the wire radius on a polywire sop, again nothing in the docs in mere mortal language, but some forum searching and ah! I can just stick an @myfloatval in the wire radius channel.

Is all this information in the docs in a way I just can't see? Do I just need to rtfm properly?

Yes I can see this on the polywire sheet:

The four numerical parameters support all the local variables of the Point operation, plus the LSYSTEM specific variables of $WIDTH, $SEGS, $DIV, $LAGE, $GEN, and $ARC.

To some degree it's gobbledegook, and I see more than 4 numerical parameters so which 4 does it mean, and my only experience of local variables is in wrangles where I can see how to tie them to incoming point attributes.

I really want to learn but I feel like I'm staggering around in the fog!

Masking forces in dops May 7, 2022, 5:03 a.m.

Hi Tomas,

I used a sop solver to group some points and set the mask attr, then under the pop wind used the multiply wrangle, works a treat. Much to experiment with still.



Masking forces in dops May 6, 2022, 12:26 p.m.


I'm trying to get more art direction into some flip sims and I want to mask or blend off the effects of things like gravity, pop forces etc. I've managed to hook up mask field to a sop sdf to affect gravity, but things like pop wind won't work in that instance.

I tried a solver sop multiplying the popwind amplitude by the length of the velocity and again it does something but I've not found a way of visualizing exactly what that's doing.

Any suggestions as to how people localise forces or effects in dops, or visualise those things would be cool.