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What’s with this reflection problem
Posted: 10 November 2012 06:31 AM   [ Ignore ]   [ # 31 ]
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The camera needs to have the same field of view as the angle of the spot light. Which turned out to be tricky to adjust because the camera setting only accepts values for the focal length.

But fortunately Casual reveals in an archive thread the relation between focal length and field of view for a Carrara camera: http://forumarchive.daz3d.com/viewtopic.php?t=175284

The formula finally collapses to: Focal Length = (21,677 / (tan (Spot Angle / 2))

So a spot angle of 140° would correspond to a focal length of 7,9 mm.

The render output must be quadratic. I disabled visibility of everything but the mirror and rendered with a white background. For using the render directly, the Invert Color box must be ticked in the spot’s Gel adjustments.

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Mirror_Reflection_Mask.PNG
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Posted: 10 November 2012 06:33 AM   [ Ignore ]   [ # 32 ]
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Light Brightness and Light Cone Intensity are set higher than I would expect for a physically correct render, but otherwise the effect would be to feeble to stand out clearly.

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Secondary_light_cone.png
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Posted: 10 November 2012 06:34 AM   [ Ignore ]   [ # 33 ]
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Because the Gel Map accepts a video as well as a still, the whole thing can even be animated. (Hope the GIFs work.)

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Mirror_Reflection_Mask.gifSecondary_light_cone.gif
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Posted: 23 December 2012 08:38 AM   [ Ignore ]   [ # 34 ]
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Hey Guys.
Someone can help me please?
I create a mirror, everything was perfect, just the resolution of mirror is horrible.
How to increase the mirror reflection resolution?


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Posted: 23 December 2012 09:18 AM   [ Ignore ]   [ # 35 ]
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Care to give some examples or explain how you’ve set up your scene?

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I find it somewhat liberating not to be encumbered by accuracy.

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Posted: 23 December 2012 01:11 PM   [ Ignore ]   [ # 36 ]
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madinyu - 23 December 2012 08:38 AM

Hey Guys.
Someone can help me please?
I create a mirror, everything was perfect, just the resolution of mirror is horrible.
How to increase the mirror reflection resolution?

I concur with evilproducer. Some information on your scene setup would be helpful.

I created a throw-away test scene that included a quick-and-dirty mirror on a wall. If I recall correctly, the Reflection Channel is set to about 95%. While it certainly acts like a mirror there is a distinct lacking in what is visible in the mirror versus the rest of the scene. Frankly, I think it made it look better.

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room_corner_upload.jpg
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- Garstor
Australian-Canadian currently trapped in Texas (maintaining sanity with doses of Carrara, LightWave and PhotoShop)

My 3D art Flickr page for final or near-final images
My 3D art Flickr page for work-in-progress or experiments

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Posted: 23 December 2012 01:28 PM   [ Ignore ]   [ # 37 ]
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Thanks Guys, finally i found the solution:
Just, in the render tab, redoucing the ‘shading rate’ under 0.10, and the resolution now is perfect!

Thank’s for your reply!

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