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Vray Displacement
show user profile  mike_renouf
I'm having problems with vray displacement modifier. I'm still getting tearing at the edges of the walls (on the chimney breast). I followed some tips in a thread a while ago and it recommended putting all the polys of the wall on the same smoothing group, and checking Keep Continuity.

Can anyone suggest some other fixes please?

Displacement Test photo test1.jpg

read 880 times
12/7/2015 10:21:26 AM (last edit: 12/7/2015 10:21:26 AM)
show user profile  donvella
1. use 3d mapping
2. select edge continuity
3. use a cleaner displacement, this has lots of grey specs in it, try posterise or just a pure black map for the mortar and white for the brick
4. dont use vray displacement for close objects, its crap
5. you can do this with rayfire bricks - much much nicer output

read 865 times
12/7/2015 12:42:50 PM (last edit: 12/7/2015 12:42:50 PM)
show user profile  mike_renouf
Thanks donvella, I'll try some of those steps to get a cleaner result.

I have actually solved it for this version by increasing the precision parameter to 32, and then putting a negative shift value the same height as the displacement value.


read 862 times
12/7/2015 12:51:35 PM (last edit: 12/7/2015 12:51:35 PM)
show user profile  mike_renouf
On reflection, it turns out that another of the mistakes i made was a real rookie one. The wall was just box mapped, so at the edges the texture didn't follow correctly. Once I unwrapped it correctly the mortar and brick flowed correctly around the corners and this cleaned it up no end.

read 856 times
12/7/2015 1:34:22 PM (last edit: 12/7/2015 1:34:22 PM)
show user profile  ijzerman
What i learned from the vray guys was shift= negative displacement/2 so for a displace of 7 the shift is -3.5.
Also, when your map isnt giving you the result you want (assuming your using a jpg right now) switching to something with a higher bitdepth 16 or more :)

:edit, typo, didnt mean shit ;)

Pushing buttons since "86
read 854 times
12/7/2015 1:37:21 PM (last edit: 12/7/2015 4:10:35 PM)
show user profile  mike_renouf
Thanks chaps. Here's what I've settled on.

Displacement fixed photo test2.jpg

read 848 times
12/7/2015 2:08:28 PM (last edit: 12/7/2015 2:08:28 PM)
show user profile  LionDebt
Still looks a bit funny to my eyes. Especially on the right-hand side where the wall joins the breast. Seems like the stonework is 'flowing' around the corner.
read 818 times
12/8/2015 10:54:40 AM (last edit: 12/8/2015 10:54:40 AM)
show user profile  STRAT
personally, i'd be happy with that displace, even though the actual design is unconventional for a breast like that (as LD was alluding to), but it's clean and continual. i would, however, adjust the actual stone material - for me it's too bumpy and shiny


read 805 times
12/8/2015 6:48:43 PM (last edit: 12/8/2015 6:50:01 PM)
show user profile  mike_renouf
I agree with the mismatching styles Strat. It's a scene I'm building for a Christmas card (no Martians - I'll leave that for Grotey, he's so good at it).

The stone won't be used for this scene. My lady is hoping to get some stone/tile cladding for her house so I said I'd try to simulate it and this was a convenient way to test a shader for when I get round to doing a visual of her house.

I think you guys are right about it being a little too noisy still. The individual stone chunks need smoothing a little.
Good tips - thanks for your time as always folks.

read 796 times
12/8/2015 10:50:44 PM (last edit: 12/8/2015 10:50:44 PM)
show user profile  donvella
I think it works well too. I may revisit displacement as i have been seeing some decent results lately

read 779 times
12/9/2015 10:00:37 PM (last edit: 12/9/2015 10:00:37 PM)
show user profile  donvella
I finally got around to creating a tutorial for the bricks if you are still interested in having a look

read 618 times
2/10/2016 9:57:46 AM (last edit: 2/10/2016 9:58:10 AM)
show user profile  ijzerman
Thanks, gonna try it later on :)

Pushing buttons since "86
read 610 times
2/10/2016 11:28:23 AM (last edit: 2/10/2016 11:28:23 AM)
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