Vray Light - directional parameter problem in Vray 2.4

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

Hi guys,

turning on directional parameter in simple playne Vray light makes the light render pitch black.

Cant see any reason why it should behave this way.

Is this a known issue? Bug?

Thanks for a reply

M

2

What value are you setting it to?

Best regards,
Vlado

3

0,5 value…to simulate a spotlight.
this happens in various scenes…i have to work around this placing a plane with a vray light mat on it bellow the light itself and excuding it from being visible by the real light

4

If you are looking at the light from the side, then it’s normal that it’s darker - after all, you’ve told it to emit light forward, not sideways.

Best regards,
Vlado

5

that would be fine if it was just dimmer, but its pitch black and i see the light from normal human perspective and the light is on a ceiling thats 3m high…imagine looking at something on the ceiling at a 45 degree angle…
Perhaps it better using the workaround.

6

Hmm, if you can post a simplified version of the scene it will help to figure out if it’s a bug or not.

Best regards,
Vlado

7

will do tomorrow Vlado, thanks!

8

Hi Vlado, i just sent the files to your mail.
Sorry for the wait!
Thanks a lot!

Martin

9

Is the directionality of your light narrower than your angle of viewing it?
For instance, if you’re looking at your light from a 45 degree angle, and it’s emiting light at a 35 degree spread - then it would be pure black to your eyes since you’re standing outside of the light it’s casting. Think of it like the light is being recessed in a hole that’s blocking your direct view of it.

10

ahh that!..hmm ok will have a look if its the case. THANKS!

11

have also posted about this in past…I have not checked lately but yesterday I did and it still seems to happen.
it happened if went beyond a certain directional amount number (can’t recall.) It was also happening if light is invisible (shows as a black rectangle in reflections.)