VrayZDeph element with opacity alpha...

V-Ray for 3ds Max V-Ray for 3ds Max :: General
1

Hello,

Is it possible to have the VrayZDeph element with opacity alpha…

For example, a leaf map on a plane + opacity…

Best regards…

2

Does this post need to be in the wishlist or RC4 will correct this ???

3

Z-depth is calculated per polygon (in any other renderer as well, as far as i know).
Coverage, layers and other channels help mix it in in post application.
Instead of opacity mapping, you’d have to use clipmapping (2D disp with waterlevel) for the Z to cater for edges.
Not cheap, but very likely doable.

Lele

4

there is always the use of 3dsmax fog on black materials rendered as different scene. this will take work though

5

The blur atmpass script might do it - get it on scriptspot.com

6

A long time I’be been working with Maya, MR standalone and p_MegaTK shaders and the z-deph was calculate with the opacity maps… and not per geometry…

Here is the shader :
http://www.puppet.cgtalk.ru/download/megatk\_e.shtml

Here is the effect with opacity maps…
http://www.puppet.cgtalk.ru/download/z\_e.shtml

It’s very easy to setup because it’s all in 1 render… but with vray I need to build a second pass rendering.

Currently i’m using a material overlay with a fallof with distance blend option…

All my vegetation stuff have the same multi/sub and I override with another with the distance blend and opacity maps… but it’s not very easy to setup… because you have to

No one knows an easy way to do that ?

Best regards…

7

Atmpass will overide all the scene material and the opcacity map will disapear… and the result will be the same as the VrayZdepth pass…

8

The easiest way to do it is to use the fog approach, but you can use this method:

(*) Turn off the “Lights” and “Default lights” options in the V-Ray Global switches rollout and turn GI off, if you are using it;
(*) If you are using any color mapping, you’ll need to revert to a basic Linear one with 1.0/1.0 multipliers;
(*) Add a Fog atmospheric effect, check the “Exponential” option and adjust its parameters until you get the result you need.

Best regards,
Vlado

9

Thanks Vlado…

I’ll try it soon…

Best regards…

10

Hi Vlado

I am just learning compositing with Zdepth at the moment and I have to say this is a really disappointing problem to run into and a very complicated work around.

I had the problem first in Scanline then I thought vray would be smarter. But no it is also dumb.

Can you write a script of change the Vrayzdepth to have the option to be based on maps instead of geometry.

11

It is in general a problem because if you have objects that are not fully transparent, it is not at all apparent how to calculate the z-depth - it could be anything from the front object, to the back object or anything in between.

With that said, I recognize it will probably be useful to have the z-depth working with transparencies, but I remember it was not an easy modification when I last looked at it and I was afraid that something else might break if I changed it… we’ll see though.

Best regards,
Vlado