Subject:
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Re: How do I...? 3 questions about POV-Ray.
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Newsgroups:
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lugnet.cad.ray
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Date:
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Mon, 12 May 2008 15:01:26 GMT
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Viewed:
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10545 times
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In lugnet.cad.ray, Daniel Collis wrote:
> Just a few questions that I've been having a need to be answered. If anyone can
> help me out.....?
> Something that I've never liked about my renders in POV-Ray is that the bricks
> are way too reflective. Sometimes they're as reflective as the mirrored floor
> I've put in it. How do I fix this?
> Also, how do I get a blue sky without it affecting(effecting?) the lights in the
> scene?
> Lastly, how do I make the tires look more like rubber than another plastic
> brick?
Hi Daniel,
It has to do with the lighting model. There are three components that are
factored and then summed to get the total brightness of a given pixel:
ambient - light that comes from all directions. On a sunny day on the north
side of your house, the light that lets you see the house is coming from all
directions (e.g. ambient) If you put your hand near the house you don't see
clear, crisp shadows.
diffuse - On a sunny day on the south side of your house, the sunlight hits
the house directly. When you put your hand near the house you see a shadow,
because you are blocking the direct light (diffuse). The shadow is not
completely black because of ambient light.
specular reflection - makes things shiny. You've got your new jet black
sports car in the sun. The little glints are mirror images of the sun, due to
specular reflection (the reflection part is the most important in the name).
Try this:
finish { reflection {0.0} ambient 0.5 diffuse 1 }
and see what the effect is. Leaving reflection at 0 will stop all shinyness.
Larger ambients (any value form 0 to 1) will decrease contrast in the picture.
I'd just leave diffuse at 1.
Making things rubber can help on a brick by brick basis, but the finish is
associated with the lights, so it affects all bricks.
Kevin
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Message is in Reply To:
 | | How do I...? 3 questions about POV-Ray.
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| Just a few questions that I've been having a need to be answered. If anyone can help me out.....? Something that I've never liked about my renders in POV-Ray is that the bricks are way too reflective. Sometimes they're as reflective as the mirrored (...) (17 years ago, 12-May-08, to lugnet.cad.ray)
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