Altitude offset function

[mhaze]

I tried to use a similar setup to get clouds to conform to the landscape but got very strange results.

[Matt]

YES! Thanks, Matt. 

Although..... it doesn't work exactly as I would have expected.... or am I doing/thinking something extremely stupid here?

I was hoping to find an easier way to restrict foam to coasts for instance...

Maybe your breakup shader is affecting the results?

[Dune]

No, it has to do with the compute terrain, I just noticed. Patch size won't make a difference, neither does feeding the compute terrain into the train of blues. Or changing any settings in the displacement tab of the PF.

[mhaze]

This works oops no it doesn't

[t0mr1ddle]

In 2.4 you can convert any displacement shader directly into a function, using "Displacement shader to vector" (in the Function/Convert menu). If you want to restrict it to only Y displacement you  can do this with Function/Convert/Y to scalar, but in typical cases where the displacement is along the normal you can just use the Displacement shader to vector node directly. That will work nicely as the cloud's altitude offset function.

Bear in mind that the cloud can never exist outside the minimum and maximum altitudes, determined by cloud altitude +/- cloud depth divided by 2. Altitude offsets and depth modulators change the shape of the cloud but can only produce cloud within this range of altitudes.

Matt

it works perfectly! thx Matt

[Simius Strabus]

Just don't forget to check the "apply high/low colour" boxes in the terrain shader...like I have...
Then it works like a charm.