chopped off peeks issue

Nala1977 · May 13, 2021, 01:52:28 PM

so im having an issue where for some reason the render output is chopping off a peek of one of my displacements, no matter what i do.

is this a bug or im doing something wrong?

WAS · May 13, 2021, 01:52:55 PM

You need to raise the displacement tolerance in the Planet node. This will effect render time though.

Nala1977 · May 13, 2021, 01:54:36 PM

oh my... why there are so many options scattered all around in this software... who would ever thought of that.
thanks Was.

Nala1977 · May 13, 2021, 02:13:03 PM

is there any other way? im confused why this is happening in the firt place since the first pillar has way more displacement and its rendered fine.

i added other 2 pillars and they basically are all chopped off. I have to increase the displacement tolerance to 4 and the render time is simply absurd for a simple shape like this..

WAS · May 13, 2021, 02:44:29 PM

Yeah I'm not sure. That's what I had to do for my geonosis landscape and it was so bad render wise, just to get a few peaks to render.

Maybe patch size also influences where sampling is occuring? Probably not.

Would be cool if this was more dynamic. Like, a setting of an individual displacement node, so it can have better tolerance, and not affect other displacement nodes. Seems with doing it via the [planet] node it is applied to all displacement on the object. Instead of just the displacement driving what needs it.

digitalguru · May 13, 2021, 05:02:57 PM

would that work if it was a Compute Terrain instead of a Compute Normal?

WAS · May 13, 2021, 05:21:10 PM

They both have the same patch size setting and produce the same patching. Compute Normal just doesn't have texture coordinates. More meant just for displacement I gather.

KlausK · May 13, 2021, 06:11:51 PM

No need to change the Displacement Tolerance at all here.
Simply set both the Simple Shape Shaders to Final Position.
That`s all.

CHeers, Klaus

WAS · May 13, 2021, 06:27:06 PM

Quote from: KlausK on May 13, 2021, 06:11:51 PMNo need to change the Displacement Tolerance at all here.
Simply set both the Simple Shape Shaders to Final Position.
That`s all.

CHeers, Klaus

That doesn't work for Power Fractal based terrains. Not even sure if it would work for simple shapes either, but if it does that's good.

WAS · May 13, 2021, 06:34:28 PM

Yeah, no. It doesn't work for Final Position for colour/disp of simple shapes, or for world space/final position for a PF

KlausK · May 13, 2021, 07:27:35 PM

Well, I did only use his scene file. And in his setup it brings back the tops.

CHeers, Klaus

WAS · May 13, 2021, 07:36:47 PM

It probably changes where the position peaks end in world space, is why. The issue is actually related to too much displacement, where less would yield a fully rendered spike but look more or less the same.

KlausK · May 13, 2021, 08:35:05 PM

hm.. $:-\$

WAS · May 13, 2021, 08:39:54 PM

That (noise space and disp) and whatever is going on with the underlying geometry. Which is why I wondered if patch size may influence it, but doesn't seem to be from my tests. I don't know if exported polys represent what the planet uses during a render, but they're not very uniform.

Nala1977 · May 14, 2021, 01:59:58 AM

tried with final position, it doesnt work either. im actually shocked you can not simply duplicate a simple shape displaced with a mixer and you get this issue.. i tried in this example a surface layer, but even with mix shader when i increase the displacement of the second pillar to match the first pillar height, it chops it off.

so i painted a mask in photoshop and tried the displacement from that image, at the same height of the previous file displacement which was (60) it didnt chop anything off.
I raised the displacement from the photoshop mask to 1400 and the cutting started to appear in a random way, this seems more like a bug.

If it was a displacement tolerance issue it should have done it for every peek? why does it randomly on some peek yes and some no?
Pretty confusing