09-06-2004, 06:59 PM
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#1 |
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Full Access Member
Join Date: Mar 2004
Posts: 22
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Wierd glare when using Image World
I've set up some models that should behave like plexiglass. I've looked at philip's whiskey bottle tutorial (the one he has on his own site), to get a feel for rendering almost transparent objects.
I've also used the HDR pic philip used to get some background. I've rendered it with caustics @ 50%, AA to medium, raytracing (shadows, reflections, transparency and refraction) w/ a recursion limit of 4 and using standard DoF, but there are some issues (see the picture I've attached): 1) The DoF doesn't apply properly. It's set to focus at an upright pane of plexiglass, but it unfortunately renders what you see thru the plexiglass as in-focus as well, even though it shouldn't be 2) Glaring from some of the objets isn't anti-aliased, and that's really annoying. It seems to happen when I use an Image World, since I've just saw it in another rendering of another model of mine. Am I missing something? What can I do? (the picture is way to lighted right now, but the issues are the same.. and ignore the bodged-together foot for the upright plexi-pane  )
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16-06-2004, 07:59 PM
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#2 |
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Full Access Member
Join Date: Mar 2004
Posts: 22
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err... anyone want to help me with this one?
BTW: Using Digital Confusion didn't straighten out the focus issue, it's still the same |
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17-06-2004, 03:07 AM
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#3 |
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Full Access Member
Join Date: Sep 2003
Location: Singapore,
Posts: 913
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Ok, i am no expert on DOF,,, as i am still trying to get it to work for me,,, but something noone has told you would be, press shift+f9 when you are in camera view to see the viewport in layout do a quick render of DOF or motion blur... Thats how you play with the settings to get it to work for you.
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17-06-2004, 08:42 AM
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#4 |
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Full Access Member
Join Date: Mar 2004
Posts: 22
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yeah, but the settings do seem to work as they're supposed to (I'm no expert either)... the DoF applies quite nicely except for the bit that you see thru the plexiglass... I can't see the usefulness of transparent items cancelling out DoF, so I'm pretty sure it's not something I told it to do.
My reluctant guess is that it's a render bug, and not a very nice one... I theorize that LW projects the stuff you'd see thru a transparent object, onto the the surface of that object before rendering. That would bring it in focus, if the transparent object is in focus.... but what do I know? Last edited by drdoe; 17-06-2004 at 08:46 AM. |
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10-07-2004, 05:30 AM
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#5 |
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Registered Member
Join Date: Feb 2004
Posts: 89
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It's not ImageWorld, it's the transparency. I ran some tests in LW8 and created a quicky scene similar to yours without ImageWorld. When transparancy was traced no DoF in the glass but without tracing transparancy, DoF happened. Tried tweaking the Refraction Index with tracing but still no DoF. Think this has been an ongoing thing with LW, remember reading others complaining about it (or could be wrong.)
__________________
Meandering to a different drummer.. |
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10-07-2004, 08:30 PM
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#6 |
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Full Access Member
Join Date: Mar 2004
Posts: 22
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thanks for trying it out in LW8 (I only have 7.5).
I never tried rendering w/o tracing, but of course tracing does project stuff onto other surfaces, so that would indeed bring it into focus. I never thought the DoF-issues were due to the use of an ImageWorld. Rather I blamed the aliased glares I got on the ImageWorld... but I could be wrong about that again, thanks for trying it out |
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