background visible through transparenies

ABK · June 11th, 2008

Hi everyone,

I have a recurring problem with transparencies with mental ray for 3DS max and have had the same problems with mental ray for XSI.

I frequently use a background image with camera visibility off for reflections (or I use an environment). However, with transparencies the background image is rendered into the object instead of the background colour.

The image attached shows an example of this.

Does anyone know a way of stopping this happening???

I have had the same problems in XSI when I turn the primary rays of a background object off.

Cheers,
Antony

mattclinch · June 11th, 2008

its a known issue. i believe there is a work around using the 'Raytype Switcher' production shader. this sits in your A+D material diffuse slot and allows you to define the colour of bounced, reflected, refracted etc rays. i believe jeff patton has a good blog entry on the unlocking and use of this shader -

http://jeffpatton.cgsociety.org/blog/archive/2008/1/

let me know if that works - haven't this issue for a while so not tried this work around.

June 11th, 2008	#2 (permalink)
mattclinch Senior Member Join Date: Jun 2007 Location: W. London Age: 25 Posts: 223 Name: Matt Clinch	Re: background visible through transparenies its a known issue. i believe there is a work around using the 'Raytype Switcher' production shader. this sits in your A+D material diffuse slot and allows you to define the colour of bounced, reflected, refracted etc rays. i believe jeff patton has a good blog entry on the unlocking and use of this shader - http://jeffpatton.cgsociety.org/blog/archive/2008/1/ let me know if that works - haven't this issue for a while so not tried this work around. __________________ Matt Clinch Arch Viz Artist @ Hayes Davidson http://www.hayesdavidson.com

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