Im currently rendering out various interior shots of an aircraft cabin. I have read that you gain more control over a 32bit float image so I made sure that clamping was not checked. So now I have the problem of jaggies on all the edges of objects where the sun is very bright.
How do other users of vray and 32bit float tackle this problem ?
Also, apart from exposure, what benefits do I have for using 32bit float ? Assuming the exposure for the image is looking good and wont be changed in post, is there any reason to use 32bit float ?
In general, you solve this with a slight bloom or glare effect in post.
You can also sort of simulate this using the Blend AA filter with a relatively large radius, but of course the blurring will also bring down the HDR range.
Normally I exclude bright light-sources from affecting specular and / or reflection. This reduces jaggies especially in very small geometry-details. This is not possible with a sunlight…
…but maybe you make the sun invisible?
I also use a shellac-material to override the VRay-material-speculars.
Good God that must hit your rendertimes! From my limited tests, shellac resulted in exponentially higher times.
Vlado is right though, the jaggy speculars are because they’re such high values. Spit out a VRaySpecular element, do a gaussian blur of between 0.5-4.0 and put it on the top of your rendering in Screen or Linear Burn mode.
But this is something for the wishlist: standard-speculars with multi-layer-control for the VRay-material. I do quite often have to exclude lights from specular/reflection because of too heavy speculars.
I dont understand why it would be that hard to create a specular bloom option that was defined by the light intensity on the objects..with a bit of control too obviously
If you need to do this often, then something is wrong either with your materials or your lights set up; it would be much better to set up everything properly than to constantly have to resort to workarounds.
I tried using this method in vfb, but it doesnt seem to work. Thats really where I would like it. Also, do the max glow effects work with 32 bit images ?
Also, increasing the DMC sampling helps. I did some tests earlier http://ascantica.com/stuff/dmcexample1.png
On the left is with “normal” settings, DMC min 1 max 6, unclamped colours.
On the right Adaptive DMC is min 1 max 100 with DMC noise threshold altered to 0.003.
It takes longer to render then a clamped picture but you get fully antialiased HDR…
