[Guiboche]

Well, no one replied yet, but I figured it out 🙂

The expression is

a = toWorldVec([0,0,1]);
b = position – toWorld(anchorPoint);
c = dot(a,b)/length(b);
if (c > 0) 0 else value

You change the 0,0,1 to 0,0,-1 for in front or behind.

Later

Guiboche

[Guiboche]

Well, no one replied yet, but I figured it out 🙂

The expression is

a = toWorldVec([0,0,1]);
b = position – toWorld(anchorPoint);
c = dot(a,b)/length(b);
if (c > 0) 0 else value

You change the 0,0,1 to 0,0,-1 for in front or behind.

Later

Guiboche