I've been working on a scene with a volumetric klieg-light and I am getting a glitch...(see image)
Some sort of a line running thru the volumetric-effect, sometimes there-sometimes not, differs in size from frame to frame, with or without multi-pass, with both raytraced or Zbuffered shadows...
Has anyone found a workaround to this?
Full Version: Glitch in volumetric light
Does the camera move in this shot?
If not, render the scene with Volumetric off, then turn all the objects black and render 1 frame with volumetric on that doesn't have the problem and composite that into the animation.
If not, render the scene with Volumetric off, then turn all the objects black and render 1 frame with volumetric on that doesn't have the problem and composite that into the animation.
I wrote a bugreport some time ago about this...
It will go away if you change the settings of the cone-angle and the width-softness slightly.
-> Bugreport
*Fuchur*
It will go away if you change the settings of the cone-angle and the width-softness slightly.
-> Bugreport
*Fuchur*
Hmm- I'll look into that Fuchur...
I AM animating the camera...as well as the cone angle and width-softness...
I AM animating the camera...as well as the cone angle and width-softness...
Fuchur---I am now trying this from your bug-report...I'll let you know...
QUOTE:Info: In this test-model, the problem occurs if you set a value of 50-55% for width-softness and a cone-angle of 15%. width-softness <= 49% and width-softness >= 56% won't give you the problem if you don't change the cone-angle.UNQUOTE-Fuchur
QUOTE:Info: In this test-model, the problem occurs if you set a value of 50-55% for width-softness and a cone-angle of 15%. width-softness <= 49% and width-softness >= 56% won't give you the problem if you don't change the cone-angle.UNQUOTE-Fuchur
QUOTE(John Bigboote @ Nov 12 2008, 12:58 PM) 
Fuchur---I am now trying this from your bug-report...I'll let you know...
QUOTE:Info: In this test-model, the problem occurs if you set a value of 50-55% for width-softness and a cone-angle of 15%. width-softness <= 49% and width-softness >= 56% won't give you the problem if you don't change the cone-angle.UNQUOTE-Fuchur
QUOTE:Info: In this test-model, the problem occurs if you set a value of 50-55% for width-softness and a cone-angle of 15%. width-softness <= 49% and width-softness >= 56% won't give you the problem if you don't change the cone-angle.UNQUOTE-Fuchur
This is a value which is only working for my special scene / model there... so your values may be different from mine... just test a little bit... I got the values by trial and error...
*Fuchur*
OK---Here's what I have found... the glitch is definitely being caused by the keyframes on both the WIDTH SOFTNESS and CONE ANGLE controls. You need to do an active test render and adjust the WIDTH SOFTNESS until you don't see the artifact- then LEAVE IT there. A work-around to not being able to animate the CONE ANGLE setting is that you CAN animate the WIDTH setting instead and get the same effect. Thanks for your help Fuchur!
QUOTE(John Bigboote @ Nov 12 2008, 01:22 PM)
OK---Here's what I have found... the glitch is definitely being caused by the keyframes on both the WIDTH SOFTNESS and CONE ANGLE controls. You need to do an active test render and adjust the WIDTH SOFTNESS until you don't see the artifact- then LEAVE IT there. A work-around to not being able to animate the CONE ANGLE setting is that you CAN animate the WIDTH setting instead and get the same effect. Thanks for your help Fuchur!
No problem, nice to hear you got it working John...
See you
*Fuchur*
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