I’m using 3ds Max Design 2012 (2013 is too buggy for me) and just upgraded to VRay 2.40.03. I have always used photometric lights (with vrayshadows) in the past I thought I would try the VRayIES. Due to my ignorance the VRayIES looks worse. I tried upping the shadow subdivisions to 32 with no luck.
settings
2012 max file here: http://pixelplume.com/vray/IES/IES%20test.max
Erco IES: here http://pixelplume.com/vray/IES/erco\_22135023\_2xcfm\_26w.ies
Thanks in advance.
Remove the negative from that singular negative number and try again. (Don’t remove the entire number, just the minus sign.)
Am I blind? I can’t see a negative value anywhere!
it’s in the ies file itself, you have to open it up in a text editor. Here’s what it looks like:
IESNA:LM-63-1995
U3643_0 BY: ERCO / LUM650
02.12.2004
ERCO Leuchten GmbH
22135023
LC Downlight
CFM 26W
TILT=NONE
2 1800 1 19 1 1 2 -.178 0 0
1.00 1.00 52
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90
0
938.8 938.8 964.9 977.9 953.3 906.9 818.6 756.0 623.3 482.0 347.1 168.5 4.1
0.0 0.0 0.0 0.0 0.0 0.0
Sorry I should have explained better. As above, and change that -.178 to .178 and save it.
tried it…didn’t work
and have you tried to decrease the cutoff value??
Bingo! it worked. I guessed and added a zero in the cutoff value (changing it from the default of .001 to 0.0001)
Thanks!
cutoff - this parameter specifies a threshold for the light intensity, below which the light will not be computed. This can be useful in scenes with many lights, where you want to limit the effect of the lights to some distance around them. Larger values cut away more from the light; lower values make the light range larger. If you specify 0.0, the light will be calculated for all surfaces.
i’m happy I’ve helped you… 
Interesting. Well thanks for that. A good tip to remember.
any solution?
yes…scroll back up
ups.-… sorry my bad.
