Opacity, minimum distance for view throw objects?

[peprgb]

Hi,

I have one simple box with Diffuse+Opacity map, behind this are some other boxes with white and red VrayMtl (at 0.108m distance, System units: m), when rendering these are invisible, here the video showing my issue.

Other boxes at more distance are viewable (green and white) so i assume there is a minimum distance? if yes, can i change this?

http://youtu.be/KiXohtoydNo

Thanks,

[Neilg]

try changing the box with opacity to a single plane. Looks like the objects not showing up might have 'visible to reflection/refraction' turned off too.

[peprgb]

Thanks, tried with Plane and same result, the Visible to rfl/rfr are on...

Strange, same behaviour with glass (see attached image)



EDITED 1: Mmm...its related with a saved Preset (draft render settings, but nothing special, Environ ON, LC 100, IRR VeryLow, Adap. Amount 1, Adap. Subd....)

EDITED 2: Got it!! it was the "Secondary rays bias", under Raytracing (Global Sw tab), i saved the Preset with this at 1.0 (doing test with overlapped geometry), and dont know why but this is the reason, putting back to 0.0 or 0.1...works fine!!