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.\" RCSid "$Id" |
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.\" RCSid "$Id$" |
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.TH PDFBLUR 1 1/24/96 RADIANCE |
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.SH NAME |
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pdfblur - generate views for depth-of-field blurring |
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.SH SYNOPSIS |
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.B pdfblur |
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.B aperture |
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.B distance |
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.B nsamp |
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.B viewfile |
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.SH DESCRIPTION |
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.I viewfile |
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and computes |
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.I nsamp |
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views based on a focus distance of |
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.I distance |
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and an aperture diameter of |
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views based on an aperture diameter of |
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.I aperture |
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(both in world coordinate units). |
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(in world coordinate units) and a focal distance equal to the length of the |
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.I \-vd |
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view direction vector. |
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When rendered and averaged together, these views will result in |
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a picture with the specified depth of field. |
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Either |
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.I nsamp |
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setting somewhere between 5 and 10 to be adequate for most images. |
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Relatively larger values are appropriate for larger aperatures. |
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.PP |
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The |
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.I \-pd |
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option of |
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.I rpict |
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may be used instead or in combination with or instead of |
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.I pdfblur |
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to blur depth-of-field. |
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If used in combination, |
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it is best to set the |
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.I \-pd |
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option to the overall |
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.I aperture |
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divided by |
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.I nsamp |
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to minimize ghosting in the output. |
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.PP |
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To simulate a particular camera's aperture, divide the focal length of |
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the lens by the f-number, then convert to the corresponding |
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world coordinate units. |
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For example, if you wish to simulate a 50mm lens at f/2.0 in |
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a scene modeled in meters, then you divide 50mm by 2.0 to get 25mm, |
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which corresponds to an effective aperture of 0.025 meters. |
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.SH EXAMPLES |
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To use |
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.I pinterp |
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to simulate an aperture of 0.5 inches on a lens focused at a |
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distance of 57 inches: |
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.IP "" .2i |
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rpict -vf myview -x 640 -y 480 -z orig.zbf scene.oct > orig.pic |
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rpict \-vf myview \-x 640 \-y 480 \-z orig.zbf scene.oct > orig.hdr |
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.br |
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pdfblur 0.5 57 8 orig.pic | pinterp -B -vf orig.pic -x 640 -y 480 |
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orig.pic orig.zbf > blurry.pic |
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pdfblur 0.5 57 8 orig.hdr | pinterp \-B \-vf orig.hdr \-x 640 \-y 480 |
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orig.hdr orig.zbf > blurry.hdr |
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.PP |
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To use |
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.I rpict |
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exclusively to do the same: |
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.IP "" .2i |
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pdfblur .5 57 5 myview | rpict -S 1 -vf myview -x 640 -y 480 |
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-o view%d.pic scene.oct |
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pdfblur .5 57 5 myview | rpict \-S 1 \-vf myview \-x 640 \-y 480 |
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\-o view%d.hdr scene.oct |
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.br |
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pcomb -s .2 view1.pic -s .2 view2.pic -s .2 view3.pic -s .2 |
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view4.pic -s .2 view5.pic > blurry.pic |
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pcomb \-s .2 view1.hdr \-s .2 view2.hdr \-s .2 view3.hdr \-s .2 |
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view4.hdr \-s .2 view5.hdr > blurry.hdr |
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.SH AUTHOR |
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Greg Ward |
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.SH BUGS |
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This program really only works with perspective views. |
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.SH "SEE ALSO" |
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pcomb(1), pinterp(1), pmblur(1), rcalc(1), rpict(1), vwright(1) |
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pcomb(1), pinterp(1), pmblur(1), pmblur2(1), |
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pmdblur(1), rcalc(1), rpict(1), vwright(1) |
