Subject:
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Focal Blur in POV-Ray
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Newsgroups:
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lugnet.cad.ray
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Date:
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Tue, 27 Dec 2005 20:01:02 GMT
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Highlighted:
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(details)
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8297 times
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I got this to work in POVRay 3.5. I am not sure if it will work for other
versions.
Here is a test render of Xpod set 4415 with focal blur:
http://www.brickshelf.com/gallery/JoJa15/Renders/4415_1e2.png
Here is the same set rendered without focal blur and with some slightly
different light settings:
http://www.brickshelf.com/gallery/JoJa15/Renders/4415_1e.png
Here is how you can add focal blur to a render. Add the following statements
within your camera definition (Within the curly braces).
focal_point <x,y,z> //replace x,y,z with the coordinates of the
point you want the camera to focus on. In this test I just used the model
center.
aperture 70 // Replace 70 with your camera aperture setting you want
to use. I would experiment with numbers. A higher number is more blurring
and a lower number is less blurring.
blur_samples 4 // Replace 4 with your own number. Fewer samples,
faster to render, more samples, higher quality image
// blur_samples 20
Here is my actual camera statement from my focal blur render:
// Camera (Latitude,Longitude,Radius = 15,30,0)
camera {
#declare PCT = 0; // Percentage further away
#declare STEREO = 0; // Normal view
//#declare STEREO = degrees(atan2(1,12))/2; // Left view
//#declare STEREO = -degrees(atan2(1,12))/2; // Right view
location vaxis_rotate(<501.235,-282.81,-824.713> +
PCT/100.0*<476.968,-255.606,-826.132>,
<-121916,-909992,211164>,STEREO)
sky -y
right -4/3*x
look_at <24.2672,-27.2038,1.41896> // calculated
angle 10
rotate <0,1e-5,0> // Prevent gap between adjacent quads
//test
focal_point <24.2672,-27.2038,1.41896>
aperture 70
blur_samples 20
//orthographic
}
Looking at the render it definitely adds focal blur but I am not too
thrilled with the actual blurring. It looks more fuzzy then a nice blur.
Here is a good example of how to use focal blur in a LEGO render (this is
not my render it is someone else's):
http://www.brickshelf.com/gallery/nicokaiser/cad/modelteam/2556-front.1600.jpg
If anyone else knows of any other techniques to do focal blur or how to
improve the look of a focal blue please let me know.
Hopefully the above information helps someone out.
- John
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Message has 1 Reply:
 | | Re: Focal Blur in POV-Ray
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| I have two comments. First of all, I see in your non-blurred render that the POVRay you have doesn't have Lars Hassing's Torus Patch. Take a look at this page, where Lars describes the problem, and provides the fix: (URL) that the fix is included in (...) (19 years ago, 28-Dec-05, to lugnet.cad.ray)
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