Vray Lights bug

[Dariusz Makowski (Dadal)]

Heya

Well its either me not knowing how to use it or its bugged. Basically I had to start using standard lights in order to gain control over spotlight parameters (hotspots/fallofs etc etc which unfortunateally vray lights does not support). When I started to light my models all was fina. I've done it from RT engine. But when I render the image its completly different. (take a look below). I've try to fix it, change shadow types, lights etc etc but they always produce that same effect.

When I had it in RT I simply turn ON Area Shadow Under vrayshadow params and it become smooth again. I guess its bugged in vray.

[vlado]

Try reducing the shadow bias for the light (do you have two surfaces close to each other?)

Best regards,
Vlado

[3DMK]

Heya

Basically I had to start using standard lights in order to gain control over spotlight parameters (hotspots/fallofs etc etc which unfortunateally vray lights does not support).

You can do this with Vray IES lights and with the amount of IES files out there, you can get shapes/falloffs that you just can't get with standard spotlights. [There are thousands & thousands of free IES lights on the net.]
And yes you CAN get nice area shadows with them as well [you may need to adjust the SIZE parameter in the IES file though, which is as easy as opening up the IES in a text file and changing a couple of numbers]

[Dariusz Makowski (Dadal)]

Heya

Vlado I dont see any shadow biass there, even if I try to adjust the Standard Vrayshadow parameters, and it still didnt work.

3DMK - Hey, thanx for the idea! However it wont work, simply because I cant control the diffuse/specular/reflection in it (disable enable etc). Even tho it still has that same bug as Standard light :O auc !


Please take a look I've created simple scene to reproduce the bug.
http://rapidshare.com/files/40226717...t_Bug.rar.html

[3DMK]

I just did some tests on a simple scene with a plane a sphere & a Vray IES light [only using your IES file as I couldn't open your max scene].
NOTE* most IES files can't create area shadows due to some negative numbers in the scale parameter.

There certainly is a cutoff problem with the IES lights as you mentioned, [but it seems to be linked to the 3ds max photometric scale]

I was able to fix the cutoff by turning OFF USE 3ds MAX PHOTOMETRIC scale in the global switches

It does seem to dim the light considerably though & renders a bit slower so you will have to turn up the multiplier, but at least it works that way.

Hope this helps