[Radiance-general] Invalid spotlight direction

[Vera Liu]

Hi Radiance experts,
I'm new to radiance and I've came across a problem when using the spotlight
as light source in the scene generation.

In radiance manual I see:
direction (-inf:inf),(-inf:inf),(-inf:inf) Min &
Max infinite
any aimed orientation

Which means I could use any vector as an orientation. But when I tried to
use:
void spotlight lightring3
0
0
7 2000 2000 2000 60 0 1 0
I get a warning: rpict: warning - invalid spotlight direction for ring
"spot2.downlight3"

I'm not sure which part I did wrong. Could I specify a spotlight with
direction 0 1 0?
Best,
Vera
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