wrong horizontal lines on caustic Vray rendering

[duduchier]

Hi,

 

I am trying to render caustics on a flat plane.

I get wrong regular strait horizontal lines. Here are some setting :

-- direct light with caustics subdivs at 400000

-- "Indirect illumination" set to OFF

-- "Caustics Multiplier" set to 100000 (!)

-- "Max photons" and "Max density" set to 0

 

I get different distance between those lines depending on the rendering resolution.

 

Since lines are regular, I thought it was a memory problem. Setting "Dynamic memory limit" to 0 and changing "render region division" does not solve the problem.

 

The problem seems new because it was not occurring last year.

I'm using V-Ray 2.30.01 and 3ds max 2013, all on 64 bits under Windows 7.

 

Here is what I get :

 

Thanks !!!

[duduchier]

hi,

 

I did not found the reason for the problem but I found a way to avoid it with my special case.

 

Errors (strait lines or regular wholes depending on the render definition) from the caustic are seen along the structure of the plane I am sending light onto. Although the plane is only one segment, caustics errors show the existence of segments. I do not know what they are.

The size of the scene was very very big. I could get rid of the errors when changing its size back to a few centimeters or meters. At least, I do not see them anymore at any output definition.

I have to add that I am not rendering only the caustic elements but I use rather use the "do not render until the end" option. I do not know why but results are better for what I want.