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Poser 12 F.A.Q (Last Updated: 2025 Jan 20 8:00 pm)
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Subject: Specularity bug - Tracked down
ghostship2 posted at 6:53AM Fri, 12 February 2021 - #4412565
Maybe this is the same problem as the infinite lights sometimes not rendering and then the next render they work again.
OK that explains why I can get a very dark render on occasions but if stopped and the render stated again with no changes the render has the expected brightness. I guess it happens about one in twenty renders but I never manged to pin point as far as the infinite lights not rendering.
I use Poser 13 on Windows 11 - For Scene set up I use a Geekcom A5 - Ryzen 9 5900HX, with 64 gig ram and 3 TB storage, mini PC with final rendering done on normal sized desktop using an AMD Ryzen Threadipper 1950X CPU, Corsair Hydro H100i CPU cooler, 3XS EVGA GTX 1080i SC with 11g Ram, 4 X 16gig Corsair DDR4 Ram and a Corsair RM 100 PSU . The desktop is in a remote location with rendering done via Queue Manager which gives me a clearer desktop and quieter computer room.
ChromeStar posted at 7:51PM Sat, 13 February 2021 - #4412548
Huh. I noticed the shadow blur turning on and off randomly from frame to frame before, but I assumed it was fixed now.
Yes, they did claim that to be the case. I guess not with all lights.
bagginsbill posted at 7:51PM Sat, 13 February 2021 - #4412521
Yikes that is broken.
Yes quite so. Incidentally, really saddened that the SM forum has been deleted. So much of your wisdom lost :'(
ghostship2 posted at 7:52PM Sat, 13 February 2021 - #4412565
Maybe this is the same problem as the infinite lights sometimes not rendering and then the next render they work again.
Ahhh, that one's not just me then? Interesting. It's been driving me crazy.
hornet3d posted at 7:53PM Sat, 13 February 2021 - #4412605
ghostship2 posted at 6:53AM Fri, 12 February 2021 - #4412565
Maybe this is the same problem as the infinite lights sometimes not rendering and then the next render they work again.
OK that explains why I can get a very dark render on occasions but if stopped and the render stated again with no changes the render has the expected brightness. I guess it happens about one in twenty renders but I never manged to pin point as far as the infinite lights not rendering.
Yes, same here. I sometimes moved the camera and the lights worked again. I thought it was a problem with the way the program was handling bounce lighting or transparency as I only ever noticed it on indoors scenes. Good to hear your take on it.
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Further to my earlier post, I have now managed to identify what is causing the specularity bug. RECAP: A figure with a single distant light, animated in a 360 degree circle, and each frame has wildly differing specularity. The problem is the shadow blur radius. If it is anything but zero, regardless of if you are are using depth mapped or ray traced shadows, creates this instability (see frames below). There was a shadow blur bug of another kind, which was supposedly fixed in version 12.0.396, but this is a new bug
WORKAROUND A distant spot does not have the specularity bug
Below - two consecutive frames - light not animated