Access to global coordinates from bump shaders

[galinette]

Dear all,

For some shaders, such as colors, it is possible to use the global coordinates with the vec3 parameter of the eval function. However, it is not possible for bump, as there is no eval(vec3) function but only a eval()

Why such a limitation? Currently, this is limiting one of my work on windows. I want to simulate the deformation of the glass. I would need for this to have access to either an instance id (already discussed) or the global coordinates, to make each window instance unique.

So please, add the vec3 pos parameter to the bump & displacement shaders!

Thanks,

Etienne

[OnoSendai]

Hi Galinette,
the main reason why bump / displacement shaders can't access the (world space ) position is that the displacement affects the world space position, so you get a kind of feedback loop.
However this can probably be worked around, so will add to TODO list (If it's not there already )

[galinette]

OK... So at least for bump, that should be a quick fix

Etienne

[fused]

(If it's not there already )

if its not, i would be kind of upset, because i requested it a couple of ties, already

[CTZn]

let's do a strike

May the problematic process be exposed so we may choose together the best way to do it ? I recon that I didn't wrap my head around this myself.

One can't relate evaporation to topological details conveniently, if at all. I'm not fond of using posOS() as the process involves several spaces potentially etc. As galinette said.

[OnoSendai]

Yeah I'll definitely add that once 3.8 stable is done, remind me then

[CTZn]

Sure will, thank you !

[zeitmeister]

Me too...


Cheers, zeiti