[SOLVED] VEX in Volume Wrangle

[jmhannu]

Hi all, 

I'm trying to write some vex in a volume wrangle but I'm really struggling atm, not sure if the problem is the syntax or my inexperience with voxels. 

I have a volume which I set up with random densities and then, in the next step, the density of a voxel should be affected by the surrounding voxels. I've done the first step but can't figure out how to access the "closest neighbour voxels". I guess they have some sort of index but can't figure out which voxel has which index or if I should access them by their position. 

Tried to use the function volumeindex() to find index and volumesample() to take a sample from a position but both only returns 0 so I'm obviously doing something wrong. I wrote it like this: 

vector pos = {2, 2, 2};
float temp = volumeindex(0, "@A", pos);
printf("%f\n", temp);
@A += temp;

It doesn't seem to matter what position I use for the vector pos, the functions always return 0 either way. So if someone knows anything about this it would be great

volumeRandom.hipnc

Edited March 7, 2018 by jmhannu
SOLVED

[f1480187]

Never used it, but it seems that volumeindex() function already returns actual value from ix, iy, iz: volumeindex
Use "A" as volume name. To access different neighbours, increment voxel indices. Current voxel's indices stored in i@ix, i@iy, i@iz variables.

[jmhannu]

Thanks! But when I use volumeindex() I only get 0.00000 in return so I guess it's something wrong with how I set the "voxel vector". This might be a very basic question but what is the voxel vector? 

I tried this: 

float temp = volumeindex(0, "@A", set(i@ix, i@iy, i@iz));
printf("%f\n", temp);
@A += temp;

[f1480187]

That should work if you will use "A" as volume name (not "@A").

[jmhannu]

Aaaah you're right, thanks!!