920fd9333e
- volumetric rendering - isosurfaces, mesh rendering - basic transformation and parent/child functionality
68 lines
1.8 KiB
Python
68 lines
1.8 KiB
Python
# -*- coding: utf-8 -*-
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## This example uses the isosurface function to convert a scalar field
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## (a hydrogen orbital) into a mesh for 3D display.
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## Add path to library (just for examples; you do not need this)
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import sys, os
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sys.path.insert(0, os.path.join(os.path.dirname(__file__), '..', '..'))
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from pyqtgraph.Qt import QtCore, QtGui
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import pyqtgraph as pg
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import pyqtgraph.opengl as gl
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app = QtGui.QApplication([])
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w = gl.GLViewWidget()
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w.show()
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g = gl.GLGridItem()
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g.scale(2,2,1)
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w.addItem(g)
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import numpy as np
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def psi(i, j, k, offset=(25, 25, 50)):
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x = i-offset[0]
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y = j-offset[1]
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z = k-offset[2]
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th = np.arctan2(z, (x**2+y**2)**0.5)
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phi = np.arctan2(y, x)
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r = (x**2 + y**2 + z **2)**0.5
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a0 = 1
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#ps = (1./81.) * (2./np.pi)**0.5 * (1./a0)**(3/2) * (6 - r/a0) * (r/a0) * np.exp(-r/(3*a0)) * np.cos(th)
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ps = (1./81.) * 1./(6.*np.pi)**0.5 * (1./a0)**(3/2) * (r/a0)**2 * np.exp(-r/(3*a0)) * (3 * np.cos(th)**2 - 1)
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return ps
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#return ((1./81.) * (1./np.pi)**0.5 * (1./a0)**(3/2) * (r/a0)**2 * (r/a0) * np.exp(-r/(3*a0)) * np.sin(th) * np.cos(th) * np.exp(2 * 1j * phi))**2
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print "Generating scalar field.."
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data = np.abs(np.fromfunction(psi, (50,50,100)))
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#data = np.fromfunction(lambda i,j,k: np.sin(0.2*((i-25)**2+(j-15)**2+k**2)**0.5), (50,50,50));
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print "Generating isosurface.."
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faces = pg.isosurface(data, data.max()/4.)
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m = gl.GLMeshItem(faces)
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w.addItem(m)
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m.translate(-25, -25, -50)
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#data = np.zeros((5,5,5))
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#data[2,2,1:4] = 1
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#data[2,1:4,2] = 1
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#data[1:4,2,2] = 1
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#tr.translate(-2.5, -2.5, 0)
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#data = np.ones((2,2,2))
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#data[0, 1, 0] = 0
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#faces = pg.isosurface(data, 0.5)
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#m = gl.GLMeshItem(faces)
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#w.addItem(m)
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#m.setTransform(tr)
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## Start Qt event loop unless running in interactive mode.
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if sys.flags.interactive != 1:
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app.exec_()
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