Light stops working

[schultzeworks]

In using the rectangular-area light, I noticed that they sometimes just stop working, even the light is "on" and I jack up the power to 10 or 20...

My best guess is that the lights do not like to be subjected to repeated 1-D and 2-D scaling, which is how I sometimes do my test renders to get the right amount of light.

My work-around is to delete the light and just make a new one a similar size, location and power setting.

[dalomar_cg]

Re: Light stops working

I've never seen what you're describing, but let me speculate a little here.

Lights are very finicky in how they can be modified, or better yet how those modifications are "registered". Of course they can't be deformed such as regular rhino geometry, but they can have more simple transforms such as moves, rotations and scaling. The only tricky one there is the scaling because the light is defined by an plane, and the extents of the light are more or less expressed in X and Y values. In other words a skewed light (one that's still planar, yet is parallelogram-ish) might be allowed by Rhino, yet is might not be registered by V-Ray.

My next question is what are you using for scaling the light? are you just doing this by eyeball or are you using Pascal's Light Utilities?

http://en.wiki.mcneel.com/default.as...Utilities.html

If you're just eyeballing it, then I wouldn't be surprised if the slightly off scaling was causing the issue.

[schultzeworks]

That's it

I was using "eyeball" scaling, so you're probably right that I was off and it got skewed. Good catch!

I haven't ever used those light utilities, so thanks for the tip -- and I'll download those pups right now. Thanks!