Reflection control

[Octane1]

First of all Hi!

I having been using VFR for a while now and find it great, however I am finding one problem that has been consistant over the past couple of years and I hope it's an easy fix!

Often there is a case when I want a smooth glossy surface but a low strength reflection, leaving Highlight and Specular Glossiness at 1 I want to control the reflection level.

I have tried what is obvious to me and reduce the fresnel level to say 1.2 etc and/or the greyscale of reflection to attempt to control the strength of reflection however I always seem to get an ON/OFF effect to reflection instead of a gradual decrease.

My current issue is black back painted acrylic. I have offset a black diffuse surface from the acrylic (0.1mm to avoid interference artifacts) the acrylic is a clear glass material with 1 refraction. Problem is that it is either super glossy or matte without any apparent in between available when tinkering with the reflection layer.

Am I missing the obvious, probably have not explained this right Be grateful for any help!!!

[frip51]

Re: Reflection control

Do you apply the reflexion to the black paint or to the acrylic material?


In reality (and I just checked it at a nearby sample), you have the reflexion only on the acrylic, not on the paint.
Also, acrylics do not have a 1 refraction, according to Google it's about 1.490 - 1.492 (whereas I always set it to 1.5).

Depending on model size and your render mesh settings, I'd even go for a .2 offset (this is what I normally do to avoid interferences at curved segments).

I'll give you an example leteron...

[han3d]

Re: Reflection control

depends on lighting conditions too

[frip51]

Re: Reflection control

Materials are to be set in a neutral environment, adding different light sources too early will mess up everything. Like in a real-life photoshooting, you adjust the lighting to fit the scene, not the other way round.


Have a look at these test images, just lowering the Fresnel Colour Value in the Reflexion Layer of the Perspex material certainly has an impact on reflectivity. Note that less reflexion means more light reaching through to the print.











btw: in this here scene there's GI (simple white colour, RGB 255|255|255) and a rectangular light (multiplier 30) - physical camera (+DOF) is on.