After alot of experiments and long-waits for MR to finish rendering , i decided to post here for an answer.
I am looking for a nice / clean / easy MR setup where i can visualize a product with a full white surrounding. As an example you can check the below link.
Seems like my render is either too dark, or the white surrounding is affecting the product itself so it's over-exposed.
I am sure it can be realized fairly quickly / easy , but i can't seem to fix it correctly - so any help is very much appreciated and a BIG Thank you in advance !!
Create a nurbs plane and move the last row of CVs up so that it covers the entire camera view. Assign a "use Background" shader to it and set the camera Environment colour to white. (Use background shader spec colour, ref & ref limit set to 0). Turn the mental ray flag "trace" to off in Attribute editor.
If you use FG or HDRI to light you scene then add a larger sphere and assign a surface shader with either a constant colour or a HDRI image mapped to it. Set the mental ray flag "visible" to off. This environment will control the look of the rendering and help you to get a properly exposed image.
The down side to using the "use background" shader is the ground shadow will not be affected by FG but you can always do a seperate pass to generate nice FG ground shadows very quickly and then comp with Photoshop.
Well not really for this image as it was rendered in 2 or 3 passes (main headphones were rendered as normal with just a plain scene and a couple of visible MR area lights and FG. The wires were then rendered against the studio backdrop I described earlier with the area lights and FG. The backdrop was lambert white.
The Backdrop did not render pure white so when I comped in Photoshop I did some removal of the shading on the ground and merged all the layers on to a white background.
It was easy in this case to do that but if the object is fully on the ground as in the sample you mentioned earlier then a combination of the use background shader and a seperate FG pass for the ground would be better.
Anyway in real project situations photoshop is your friend.. Sure, it's great the perfect render straight from the 3d app but if you have to meet tight deadlines then it's often easier to touch up in PS.
