Transparent White Buildings

[johng80]

I'm trying to make the context building look white and transparent, but inside they are coming out yellowish or reflective.

 

bldg mtl:

 

diffuse: 255,255,255

 

reflection: 0,0,0

glossiness: 1.0

 

 

refraction: 193,193,193

ior: 1.0

glossiness: 1.0

 

 

max File:

https://dl.dropbox.com/u/4755701/AERIAL-GHOST.max

 

[abhaysingh]

Hi,

This is because you are using Vray sun.Vray Sun changes its intensity and color with change in height from horizon.Iam sure you knew that.

Right now, whole scene has tint of yellow.

Possible solutions

1)Use "Standard Target light".Its color and intensity doesn't changes with height from horizon.

2)If you still want to use Vray sun, then you can switch to vray physical camera, where you can control white balance.But remember, the white balance in physical camera is based on color wheel, which means whatever color you give, vray will give the opposite/invert of that given color.There are also some presets which you can use.

3)With vray sun, you can use "Vray env" to give little blue tint."Color mapping" may also help.

4)If you don't want to use any of the above options then you can take out "Object Id" render pass of those transparent buildings and fix your problem in post (in AE or Photoshop using object id render pass).

 

I've attached your render and a render of same scene with Target Direct light for comparisons.

 

By the way, don't use refraction for transparency.Instead, you can use "visibility" option in "object properties".I think it will render fast.

 

Sorry for the long answer..

 

Hope this helps,

 

Abhay.

[Corey Beaulieu]

I would suggest that you render your image twice. One time without the buildings that you want to be transparent using whatever settings you find acceptable and a second time where the transparent buildings are rendered with a vraylight material (tick compensate for exposure, multiply by opacity and emit on backside). With this you can set everything else as a matte object in vray properties an turn GI off (it will render very quickly).

 

From here you can choose to render by object visibility (if you want the backfacing wall to be visible) or just outright render it and use a post production program to adjust its opacity. I also use a VrayDirt map to give the light material some edges and occlusion and even vraytoon shader from time to time. It all depends on what you want, but the overall point is that you can render your textured stuff the way you want and then add context the way you want. You don't have to redo your lighting.

 

** One final thought is that if you render using object visibility then be careful that the base of the building doesn't create double geometry with the ground plane. Seeing through a building means that you are going to see internal collisions that we usually don't see.

Edited October 12, 2012 by CoreyMBeaulieu