Here I have 3 different results for SketchUp (2014), the same thing rendered in Twilight, and then a rendered ArchiCad model.
The location, latitude, longitude, day and time were set exactly the same for SketchUp and ArchiCad
As you can see, there are 3 different results.
Which one can we trust ?
Some may think it is not significant, but when we apply a sun study to a building and the effect overshadowing may have on an adjacent site, the legal implications of getting it wrong could be very costly.
SUN STUDY - DIFFERING RESULTS
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SUN STUDY - DIFFERING RESULTS
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- SKETCHUP.JPG (160.9 KiB) Viewed 6860 times
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- TWILIGHT RENDER.JPG (167.08 KiB) Viewed 6860 times
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- ARCHICAD.JPG (67.69 KiB) Viewed 6860 times
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- Posts: 650
- Joined: Thu Sep 03, 2009 2:26 pm
- SketchUp: SU8 to SU2019 Pro
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Re: SUN STUDY - DIFFERING RESULTS
UPDATE :
I have solved the problem with ArchiCad, and I can now get the same results as SketchUp. It turns out that ArchiCad's render engine has its own Sun settings which will provide a different result from ArchiCad's own internal Sun settings.
So, I can assume that SketchUp and ArchiCad a both correct.
The difference in TW is puzzling though. We had a similar issue in an earlier version.
I have solved the problem with ArchiCad, and I can now get the same results as SketchUp. It turns out that ArchiCad's render engine has its own Sun settings which will provide a different result from ArchiCad's own internal Sun settings.
So, I can assume that SketchUp and ArchiCad a both correct.
The difference in TW is puzzling though. We had a similar issue in an earlier version.
Re: SUN STUDY - DIFFERING RESULTS
In the Environmental Dialog, did you check "Corrected Shadows"? By default, the Twilight Render sun is much closer (and smaller) than a "real" sun. This produces better soft shadows but also introduces some parallax errors in shadow direction. Clicking "Corrected Shadows" pushes the sun out to a realistic position (and size) to produce better sun position but doesn't have as good soft shadows.
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- Posts: 650
- Joined: Thu Sep 03, 2009 2:26 pm
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Re: SUN STUDY - DIFFERING RESULTS
Thank you Chris.
No I hadn't thought to check the 'Correct Shadows'. However, when I did, it made little or no difference.
In the meantime, I'll just adjust my settings by 30 minutes to make sure the render is the same as SketchUp.
When I get some spare time I'll delve into this further.
I have a theory (that could be dangerous eh ??) but I need to test it on a few examples first. I'll let you know what happens.
Cheers,
Gareth
No I hadn't thought to check the 'Correct Shadows'. However, when I did, it made little or no difference.
In the meantime, I'll just adjust my settings by 30 minutes to make sure the render is the same as SketchUp.
When I get some spare time I'll delve into this further.
I have a theory (that could be dangerous eh ??) but I need to test it on a few examples first. I'll let you know what happens.
Cheers,
Gareth
Re: SUN STUDY - DIFFERING RESULTS
that's unexpected.Gareth wrote:... check the 'Correct Shadows'. However, when I did, it made little or no difference...
Care to share the file for us to test? Is it far from the 0,0,0 origin of the world coordinates for SketchUp?
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- Posts: 650
- Joined: Thu Sep 03, 2009 2:26 pm
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Re: SUN STUDY - DIFFERING RESULTS
Fletch wrote:that's unexpected.Gareth wrote:... check the 'Correct Shadows'. However, when I did, it made little or no difference...
Care to share the file for us to test? Is it far from the 0,0,0 origin of the world coordinates for SketchUp?
I haven't kept the file for the above test....it was pretty quick though and I'll do another one shortly.
As for the 0,0,0 coordinates, frankly I cant remember, but I don't believe it was too far from it.
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