OSL displace() function not recognized

[marksnoswell]

Editor recognizes displace() but on compilation the scanline renderer is throwing the following error
"Displace" is not known.

Is this meant to work? ... or is just not implimented yet?

[lgritz]

displace() seems to be unimplemented, despite being documented. Sorry. The equivalent is simply

P += displacement_amplutide * displacement_direction;
N = calculatenormal(P);

(where displacement_direction is often N, but doesn't have to be)

I'm not sure why it's missing. I suspect we meant to get to it, but somehow everybody just used the code above and didn't ask or point out that the function was not there.

I'll add it to future releases to be complete.

[MasterZap]

@lgritz Isn't the situation the same with bump() that actually is in the docs but doesn't exist in reality?

/Z

[lgritz]

Yes. And the equivalent of bump is

N = calculatenormal (P + displacement_amplitude * displacement_direction);

[lgritz]

Actually, I think in both of those cases, it's safer if you ensure that the resulting N is still unit-length, by changing where I wrote

N = calculatenormal(...)

to

N = normalize(calculatenormal(...))