FocalBlur: Difference between revisions
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(angles as Fermat's spiral instead of random) |
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<source lang="python"> | <source lang="python"> | ||
from pymol import cmd | from pymol import cmd | ||
from os import system | from os import system | ||
from tempfile import mkdtemp | from tempfile import mkdtemp | ||
from shutil import rmtree | from shutil import rmtree | ||
from math import sin,cos,pi | from math import sin,cos,pi,sqrt | ||
def FocalBlur(aperture=2.0,samples=10,ray=0,width=0,height=0): | def FocalBlur(aperture=2.0,samples=10,ray=0,width=0,height=0): | ||
Line 88: | Line 86: | ||
for frame in range(samples): | for frame in range(samples): | ||
# Angles to rotate protein and light | # Angles to rotate protein and light | ||
# Populate angles as Fermat's spiral | |||
y | theta = frame * pi * 110.0/144.0 | ||
radius = 0.5 * aperture * sqrt(frame/float(samples-1)) | |||
x = cos(theta) * radius | |||
y = sin(theta) * radius | |||
xr = x/180.0*pi | xr = x/180.0*pi | ||
yr = y/180.0*pi | yr = y/180.0*pi |
Revision as of 12:10, 8 June 2011
Description
This script creates fancy figures by introducing a focal blur to the image. The object at the origin will be in focus.
Usage
Load the script using the run command. Execute the script using PyMOL syntax:
FocalBlur aperture=2.0,samples=100,ray=1
or using python syntax:
FocalBlur(aperture=2.0,samples=100,ray=1)
For additional options, see the script comments.
Notes
- When using raytracing, the image creation will take n times longer than normal, where n is the number of samples.
- The script uses ImageMagick for creating the blured image. It has only been tested on Linux
- The aperture is a purely arbitrary value and not related to f stops on a camera.
- There is a bug preventing custom image sizes when not using raytracing.
Examples
Script
Load the script using the run command
from pymol import cmd
from os import system
from tempfile import mkdtemp
from shutil import rmtree
from math import sin,cos,pi,sqrt
def FocalBlur(aperture=2.0,samples=10,ray=0,width=0,height=0):
'''
DESCRIPTION
Creates fancy figures by introducing a focal blur to the image. The object
at the origin will be in focus.
AUTHOR
Jarl Underhaug
University of Bergen
jarl_dot_underhaug_at_gmail_dot_com
USAGE
FocalBlur aperture=float, samples=int, ray=0/1, width=int, height=int
EXAMPELS
FocalBlur aperture=1, samples=100
FocalBlur aperture=2, samples=100, ray=1, width=600, height=400
'''
aperture, samples = float(aperture), int(samples)
ray, width, height = int(ray), int(width), int(height)
# Because of a bug, only custom sizes when raytracing
if not ray:
width=0
height=0
# Create a temporary directory
tmpdir = mkdtemp()
# Get the orientation of the protein and the light
light = cmd.get('light')[1:-1]
light = [float(s) for s in light.split(',')]
view = cmd.get_view()
# Rotate the protein and the light in order to create the blur
for frame in range(samples):
# Angles to rotate protein and light
# Populate angles as Fermat's spiral
theta = frame * pi * 110.0/144.0
radius = 0.5 * aperture * sqrt(frame/float(samples-1))
x = cos(theta) * radius
y = sin(theta) * radius
xr = x/180.0*pi
yr = y/180.0*pi
# Rotate the protein
cmd.turn('x',x)
cmd.turn('y',y)
# Rotate the light
ly = light[1]*cos(xr)-light[2]*sin(xr)
lz = light[2]*cos(xr)+light[1]*sin(xr)
lx = light[0]*cos(yr)+lz*sin(yr)
lz = lz*cos(yr)-lx*sin(yr)
cmd.set('light',[lx,ly,lz])
# Save the image
cmd.png(tmpdir+'/frame-%04d.png' % (frame),width=width,height=height,ray=ray)
# Return the protein and the light to the original orientation
cmd.set('light',light)
cmd.set_view(view)
# Create a blured image of all the frames
system('convert %s/frame-*.png +matte -average %s/blur.png' % (tmpdir,tmpdir))
# Load the blured image
cmd.load('%s/blur.png' % (tmpdir))
# Delete the temporary files
rmtree(tmpdir)
cmd.extend('FocalBlur', FocalBlur)