I think I have uncovered a fundamental flaw with Sketchup’s shadows. Basically I have 2 buildings on a flat site where building 1 is casting a shadow onto building 2 and the surrounding ground plane. I want to determine the extent of building 1’s shadows on the ground plane when they are ‘reduced’…

Thus the shadow conditions at the time the draft is usually done just before and after the rendering automatically rendered shadow disappeared. hope it is useful

[image] pjnz: Am I missing something here, or is Sketchup calculating shadows on a plane-by-plane basis, rather than taking into account all objects within the shadow’s path? I can replicate the behavior. The cube being set to not cast shadows, SU treats the cube as if it didn’t exist. Seem…

[image] Geo: Seems a bit odd, but then so does a shadow study wherein a building in sunlight casts no shadow.What’s the point? So the cause of this behavior may be that someone overlooked this slightly illogical combination while programming the shadow logic.

[image] Geo: Seems a bit odd, but then so does a shadow study wherein a building in sunlight casts no shadow.What’s the point? Auckland Council have a requirement to show the building’s specific shadow impact on the surrounding area minus any existing buildings. Kinda strange, but unfortunate…

[image] slbaumgartner: So the cause of this behavior may be that someone overlooked this slightly illogical combination while programming the shadow logic. That, and SU doesn’t calculate the phases of the Moon. I’d wager some day, some building owner will claim some proposed structure interf…

[image] pjnz: Auckland Council have a requirement to show the building’s specific shadow impact on the surrounding area minus any existing buildings. Kinda strange, but unfortunately necessary. I suppose for such demonstrations one could paint the surrounding buildings with a translucent mate…

[image] Geo: I suppose for such demonstrations one could paint the surrounding buildings with a translucent material.A face bearing a translucent material won’t cast a shadow until the material opacity reaches 70%A translucent material will not receive a shadow until opacity is 100% Geo, than…

[image] pjnz: Geo, thanks for the suggestion, but the point is that I need building 1’s shadow to react to building 2 as if it did exist. Perhaps a little sleight of hand would work. Then again, this trick might not be so good for a complex model with several time scenes. Here, a separate …

Shadows are not correct

Technical Problems SketchUp

Geo June 2, 2015, 1:08am 3

I can replicate the behavior.
The cube being set to not cast shadows, SU treats the cube as if it didn’t exist.
Seems a bit odd, but then so does a shadow study wherein a building in sunlight casts no shadow.
What’s the point?

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Shadows are not correct

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