VRay - antialiasing on reflections problem :/

#1

Hello,

I rendered some test scene witw VRay and I have a problem with antialiasing on highlights.
Here is my rendered scene:

As you can see, reflections are very hard-edges… I want them to be soft…
Can you help? :slight_smile:

Regards, Alek

#2

sub pixel mapping in color mapping should help

#3

Yeah! Its working, thanks:) Alek

#4

also the clamp option on the same rollout will help with that

#5

I think the real problem may be that the brightest value is too high, probably more than 100%. If you just decrease the strenght of your light source or reflection source until it reaches 100%, you will still get a pure white as a result but no jaggy edges. And less rendering time.

If you use a linear workflow and render to 32 bits float EXR at gamma 1.0, you can even fix this in comp. you will get jaggy edge at first but just lowering the exposure in comp will fix this.

#6

the clamp option does just that, it clamps the values higher than 1 to 1, so it can properly do the antialiasing

#7

One question I have about clamp is: does it retain all the high dynamic range of the picture if we use linear workflow?

For example, if I do DOF and motion blur in comp will I still get all the same richness of the highlights linear workflow gives…?

#8

im not sure but i don´t think it keeps it

#9

I got an answer by looking at the vray forum. Vlado suggest to use a value of 5 or 6 if we use clamping and if we want to keep some HDR info. Since v1.5 we can input a clamp level. Normally it clamps everything above 1 but with this set to 6 it will only clamp above 6, keeping a bit of the HDR.

#10

Sometimes what I do is
a) turning off visible in reflections in vray lights
b) placing ‘blends’ in area lights position (grids with vray light material, map slot with painted texture/or gradient shader to get some softness on edges).
It may not be ‘physicall correct’ but it a) can reduce rendertimes b) fixes hard edges c) helps fighting flickering on thin objects/thin bevels

#11

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