Reflection all or nothing bug?

[Anonymous]

Hi

I try to make my own materials and textures for projects.
So I tried to make a black marble wall, with that subtle reflection of a dark polished surface.
The problem is that 30% reflection gives 0 reflection and 40% reflection is mirror like (see pictures).

Any idea why is that?

It happens on A 18 both Mac and Windows.

merci

[Anonymous]

Hi, Christian, I had the same problem before.
Check here this can help you
http://archicad-talk.graphisoft.com/viewtopic.php?t=52377

[Anonymous]

Thank you.
Also found here:
http://archicad-talk.graphisoft.com/viewtopic.php?t=48928&sid=04dea29cc5aa8e28a45456828ccf4b0c

That ray threshold...