HI! Just another background image question...

[hacopi]

"Well, doing things like compositing into complex reflection/refraction environments is by no means a one-click solution...even in Max. As far as how to get this done in Rhino, I would suggest using the BackgroundBitmap command. From there, you can align your scene to the image and set up the camera. After that, then place an image behind your objects that has the image that you're trying to comp into and is normal to the camera. To do this, set your construction plane to View (Cplane> View) and use the PictureFrame command to insert and size the image (it will actually be a plane though). Now make a V-Ray material that has the image in the Diffuse layer and has an alpha contribution of 0(you'll need the SR for this...Material>Options>Alpha Contribution). That will help you get better refractions, although you'll still need to set up you're environment too.

Also, if you have a refractive material, it would be a good idea to check the Affect Alpha option in the Refraction layer of the material"


Hey guys, Ive been stuck on this for a while now so i need some real help. The above quote was probably the best one Ive read but for a noob like me, its still a bit confusing.

Can someone step by step walk me through placing an image in the background I will be forever grateful. Keep in mind i am new to all this. So far i got down the whole turn a plane into an image thing. Ive been dabbing at trying to get the right perspectives (its an architectural work) but i just cant get it right. And what is all this about alpha contribution and diffuse layers? Ive read a few threads containing the same problem with a few answers, most telling the individual to work in photoshop, but my piece is a bit too complex to mess with it in photoshop.

[Micha_cg]

Re: HI! Just another background image question...

Hmm, it's anything sayed.

"And what is all this about alpha contribution and diffuse layers?"

answers was: "Now make a V-Ray material that has the image in the Diffuse layer and has an alpha contribution of 0(you'll need the SR for this...Material>Options>Alpha Contribution)"

It mean: you open the material for the background image, set a texture at the diffuse layer. Than you open the options of the material and ... that makes, that the background image will be transparent at the rendering, so that you can add the image at Photoshop later again. (precondition: VFB channel "alpha" is enabled)

For a simplier, direct way I would try to use a background material with textured emitter layer instead textured diffuse layer (set diffuse layer black now), maybe so you don't need the "Alpha Contribution 0" thing and you can direct render the image with a visible background.