Background + sun shadows problem...

[cecofuli]

Hi,
as you can see in this image, my intention is to obtain a nice sun shadow, but with background (BG) on.
I used Corona ContantMtl, I tried to turn off "Cast Shadows" in the object properties, but nothing works.
If I hide the BG plane, obviously, I can see the sun shadows XD
Do you have some suggestion?

[cecofuli]

Ok, with CoronaMtl, "Cast shadows" works. so I think it's a CoronaConstantMtl bug (or limit)

[maru]

Strange, this doesn't happen for me. Corona constantmtl shouldn't cast shadows by default. As far as I remember you should never disable "cast shadows" from object's properties as it is fake and can significantly increase render time.
Do you only have "directly visible" checked in constantmtl's settings?

[cecofuli]

Mmm.. I don't use the A5, but A5 daily May 31 2013, cause A5 has a bug in the Proxy Asset tracking and I'm not able to open my old file (3ds max crash) cause Corona doens't recognize the correct proxy file path. I don't know if in A5  CoronaConstantMtl works better.

[Stan_But]

why u don't use Alpha 5 release?)

[j_forrester]

Any other suggestions or fixes for this issue as most visualisers i know use this workflow. i.e and image back-plate set to "don't cast shadows". Then you get the colour in reflections from the back-plate with the expected shadows properties from the sun system.

[borisquezadaa]

How about selecting sun and hit "exclude" adding the background to that list?.

[romullus]

j_forrester >> there is CoronaRaySwitchMtl material for this purpose.

[j_forrester]

Romulus,

Thanks for the tip. Looks like it should do the job fine.