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Displacement - Triangulation Issue

derekjackson
Booster
Hi,
I'm playing around with CineRender's Brick shader, and trying to get some convincing results when using it in conjunction with Displacement.

I've just done a test render and there seem to be some real oddities. The shadows between the bricks appear larger and blurred in certain areas (boxed in red). There's also a weird diagonal artefact on the first floor. The wall is one consistent element, yet the change seems to be related to window position. I can only assume it's something to do with how the wall is triangulated at render time.

Has anyone else had this? Is it a PhotoRendering setting that I've got wrong, or a bug of some sort? Any advice welcome!
8 REPLIES 8

How big of a displacement are we talking? I generally start modelling anything from 10 mm up. The few times I've tried displacement the render times were rediculously long.
Erwin Edel, Project Lead, Leloup Architecten
www.leloup.nl

ArchiCAD 9-24 NED FULL
Windows 10 Pro
Adobe Design Premium CS5

derekjackson
Booster
10mm. Render took about 3 hours, so using Displacement seems plausible for the odd shot - if it looks okay!

3 hours is too long for me

We do a lot of renders for clients and try to keep them at around 5 mins max for exteriors, where we finish things off with a bit of photoshop.

Creating a pattern in a complex profile won't take very long and the render without displacement will be fast.

I did notice some weird behaviour when I was still trying stuff out with cinerender around AC18 times to get to a mode where we are now with render times nice and fast and decent enough results.

I think the best results were with creating a morph plane with subdivision that sat on top of the actual surface. It's been a few years, so maybe someone else who is actually using this stuff can shed more light on the subject.
Erwin Edel, Project Lead, Leloup Architecten
www.leloup.nl

ArchiCAD 9-24 NED FULL
Windows 10 Pro
Adobe Design Premium CS5

derekjackson
Booster
Hmm - a morph plane would be a major hassle, given that we're still shuffling window positions around.

Shame that the Displacement shader can't be relied upon - the bits that worked look great!

Has anyone found a way around the issue via settings in the Displacement shader options?

Thinking back this might have been sub polygon displacement.

Just had a look at the help for this: https://helpcenter.graphisoft.com/user-guide/77481/

Not overly thrilled by the results for bricks there. Edges are too rounded / soft to be believable, IMO.
Erwin Edel, Project Lead, Leloup Architecten
www.leloup.nl

ArchiCAD 9-24 NED FULL
Windows 10 Pro
Adobe Design Premium CS5

derekjackson
Booster
Well I'm trying the sub-divided Morph plane trick to see if that works. I can always up the SPD number too...

Yep, the rounded bricks don't look too good up close, but it should work well from a distance - mortar shadows relating to sun position, nice silhouettes on building edges, etc...

Lingwisyer
Champion
If you use a Normal map instead, I do not think you get the rounded effect.



Ling.
AC22-23 AUS 7000
Self-taught, bend it till it breaks.

Win10 | E5620 x 2 | 24GB | K2200 RIP PSU
Win10 | R5 2600 | 16GB | GTX1660

derekjackson
Booster
True, but you don't get the nice silhouette either...

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