fine joints and metal issues

[tricky]

I always seem to have problems when rendering metal cladding and fine joints. You can see in the following image that the joints are very messy, and the metal profiled cladding is blotchy. What must I do to correct these problems? Any tips would be greatly appreciated.

Some of my settings:
The metal material uses interpolated glossies, with Subdivs set to 75
AA filter set to Area, size 1.5
Image sampler set to adaptive 0,6
IR map presets set to High
HSph. subdivs = 140
Interp samples = 75
Check sample visibility checked
HDR map in the environment slot to get nice reflections

[paulison]

Are your settings for a frame in an animation? area filter etc...

if its a still image then just rendering at a higher resolution will do the trick although have you tried lowering the interp samples? 75 seems really high!

If this is for an animation...I have the same problem! Some people suggest rendering at double resolution with lower GI settings (you shouldnt need to use the high presets) and lower the hsubs.

0-6 seems like a setting for adaptive QMC rather than just adaptive.

just to try some radiacal differences, try these:

AA filter to Catmull-rom
Antialiasing to adaptive 0,3
IR map presets to medium/ medium animation
Hsubs to 70
Interp samples 20
and...render at twice the current resolution

last thing is using interpolation for reflective on the metals...have you tried not using this, and just leaving the value at around 30?

Something along these lines should be fine for a still image, but for an animation....arggg!

[tricky]

Its a still image, and we render them at around 4000 pixels accross. If I were to try NOT using interploated glossies (at your suggestion of around 30), the machine would literally take about 4 days to render! I just tried with a setting of around 10, and it took about 36hours, which is obviously ridiculous - it is also very grainy.
0,6 is adaptive (its usually set to around -1,5 but I upped them to see if it would help.

I've seen other people with similar issues, but nobody seems to have a solution.

[brian80]

think that 0,6 for AA is reaaaaaly too much.
paulison is right.... 0,3 is the best setting to use.

[ezrhythm]

we've done some similar project for factory visualization... we used bump map for joints, easier and headache free.

Anyway, the only solution in my opinion is tweakin AA or atleast change it to catmullom@0,3 as others mentioned.

[unknown]

mapping all the way. If your not going to get close then why bother with the extra work of modelling and setting up ultra high settings to get it rendered. The stage your at, can you not tidy the gaps up in photoshop, I assume it will be getting post treatment anyway.
everything can be sorted in post. Adding blurred reflections, getting rid of blotches (to a certain extent)etc

[tricky]

Yes, I generally do end up sorting out joints in post - I just wondered why Vray cannot seem to handle the rendering of them well in the first place. The less post work, the better.

What post will not solve is the 'noisy' soft reflections of large areas of metal cladding. Surely SOMEBODY has reliable settings for getting smooth results???

To clarify, I use the following material and get blotchy results. Can someone test it please and tell me where I am going wrong. BTW, I usually use a HDR map in the reflection slot of Render Settings - don't know if this makes any difference.

[natty]

Try using Adaptive QMC AA... and also look @ the QMC sampler settings..

[tricky]

Hi Natty - Happy New Year!

Here's a snapshot of my settings - what do you think? These still produce grainy results. Could it be that there just isn't enough light bouncing around?

[natty]

hi ..

75 for your Interp sample is way to high and Blurry !!..

go for 25 and HSph sample 80... 140 is real high

Direct compute...

subdivs = 10
depth =10

Dist Thresh = 0.4

also try ticking The Normals for the AA ..

see how that goes..

[paulison]

nice tips Natty

ive noticed on a recent job I was working on that ticking rand actually makes my fine lines look worse than if it is unticked with adaptive QMC for AA. Maybee worth a try also?

I wonder if just changing the interp samples would fix the problem. His other settings are damned high really so hopefully thats it!