[Sidefx-houdini-list] Disable Gravitational Lensing

Floyd Gillis floyd at afcg.com
Tue Aug 14 22:39:31 EDT 2012

OK.  Perhaps I was being a little too cutesy with my previous post... 
but there was a serious side to it.

I'm getting a strange artifact when rendering with DOF.  The blurred 
area around foreground elements is warping the background, (hence the 
"gravitational lensing" reference).

If you step through the 10 frames here... 
http://www.afcg.com/.lensing/fram_05.html you can clearly see what's 
happening.  The yellow spheres are using the mantra surface shader and 
don't have any object reflection, refraction, transparency, or 
displacement.  This warping effect becomes a bit distracting during a 
full animation sequence.

Has anyone experienced this before?  Is it a standard artifact from DOF 



On 14/08/2012 12:02 PM, Floyd Gillis wrote:
> Hello list,
> I'm having a problem with unwanted gravitational lensing.
> Anyone know how to access this render property so it can be disabled?
> Here's an example... http://www.afcg.com/.lensing
> Houdini 12.0.626 on linux.
> Thanks in advance for any help.
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