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Am 12.09.2016 um 16:42 schrieb Mike Horvath:
> In this test scene the light source is stuck at the horizon when it
> should be up in the sky.
But the looks_like object is translated perfectly fine.
What you see is the highlight remaining unchanged; but the highlight
doesn't show where the light source's nominal position is -- it shows
the direction the light is coming from.
And that direction is unchanged: With a parallel light source, the
direction of all light rays depends only on the /relative/ location of
two points: The light source's nominal center and the point_at
parameter. But transformations act on both these points (I've just
checked the code), so a translation operation changes only the absolute
location of the points, not their relative location to one another. And
thus the light direction remains unimpressed.
(BTW, point_at defaults to <0,0,1>.)
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On 9/12/2016 11:59 AM, clipka wrote:
> And that direction is unchanged: With a parallel light source, the
> direction of all light rays depends only on the /relative/ location of
> two points: The light source's nominal center and the point_at
> parameter. But transformations act on both these points (I've just
> checked the code), so a translation operation changes only the absolute
> location of the points, not their relative location to one another. And
> thus the light direction remains unimpressed.
>
> (BTW, point_at defaults to <0,0,1>.)
>
Crap. I wish I'd known that. Now I have to go back through all my scenes
and set point_at to <0,0,0>. Might want to mention this in the docs too.
For instance, you might want to change this:
Light source default values:
LIGHT_TYPE : pointlight
falloff : 70
media_interaction : on
media_attenuation : off
> point_at : <0,0,0>
radius : 70
tightness : 10
Mike
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