Reflection Pass - In Need of a Clean

Playdo

I'm rendering a reflection pass using a Matte/Shadow/Reflection material. Ambient Occlusion and shadows are switched off - only receive reflections are enabled.



As you can see in the pic there is some blotchiness showing in the reflection. There is only a skylight in the scene. I've played around wih most of the settings ie. final gather precision, glossy reflection precision but I'm unable to completely get rid of it. Any ideas of the cause and how to fix it? Or a good way to get a clean reflection on a plain white background (The object has a MR material)?

Ark

You need to tell your object not to cast or recieve shadows, if you want to get rid of the shadows in the reflection.

Playdo

Nope. Changed that for both the object and the floor - no difference. I don't think it's to do with shadows.

Ark

Well if your shadows are off, why is there still shadows where the object is meeting the plane?

Are you sure AO is switched off in the globals?

Are you using any FG or GI?

Playdo

Good point. Receive and Cast Shadows were both disabled for the object and the plane. There is only a skylight present so I presume that it's due to AO though AO is disabled in the M/S/R material. I seem to have fixed the blotching though by going to Final Gather - Interpolate Over Num. FG Points - reducing the value to 0.

Playdo

Where is the global setting to switch off AO? Yeah I've been using FG. If I disable it then I get a black and white render.

Ark

Playdo wrote: »

Where is the global setting to switch off AO?

I don't use max sorry, but in xsi theres a global setting that gets applied by default, if its the same in max, then it should be under the mental ray options.

Playdo wrote: »

Yeah I've been using FG. If I disable it then I get a black and white render.

Thats weird.

Quack!

I'm assuming that black line you guys are seeing is what you are calling a 'shadow'. To me it looks like your object is above the reflection plane just a bit, and the plane is reflecting the underside of the object, which would be reaalll dark and look like a shadow.

Ark

Still... with shadows disabled that area with the shadow shoudn't be in shade.