64 lines
1.5 KiB
Python
64 lines
1.5 KiB
Python
# -*- coding: utf-8 -*-
|
|
"""
|
|
This example uses the isosurface function to convert a scalar field
|
|
(a hydrogen orbital) into a mesh for 3D display.
|
|
"""
|
|
|
|
## Add path to library (just for examples; you do not need this)
|
|
import initExample
|
|
|
|
import numpy as np
|
|
import pyqtgraph as pg
|
|
import pyqtgraph.opengl as gl
|
|
|
|
app = pg.mkQApp("GLIsosurface Example")
|
|
w = gl.GLViewWidget()
|
|
w.show()
|
|
w.setWindowTitle('pyqtgraph example: GLIsosurface')
|
|
|
|
w.setCameraPosition(distance=40)
|
|
|
|
g = gl.GLGridItem()
|
|
g.scale(2,2,1)
|
|
w.addItem(g)
|
|
|
|
## Define a scalar field from which we will generate an isosurface
|
|
def psi(i, j, k, offset=(25, 25, 50)):
|
|
x = i-offset[0]
|
|
y = j-offset[1]
|
|
z = k-offset[2]
|
|
th = np.arctan2(z, np.hypot(x, y))
|
|
r = np.sqrt(x**2 + y**2 + z **2)
|
|
a0 = 1
|
|
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)
|
|
return ps
|
|
|
|
|
|
print("Generating scalar field..")
|
|
data = np.abs(np.fromfunction(psi, (50,50,100)))
|
|
|
|
|
|
print("Generating isosurface..")
|
|
verts, faces = pg.isosurface(data, data.max()/4.)
|
|
|
|
md = gl.MeshData(vertexes=verts, faces=faces)
|
|
|
|
colors = np.ones((md.faceCount(), 4), dtype=float)
|
|
colors[:,3] = 0.2
|
|
colors[:,2] = np.linspace(0, 1, colors.shape[0])
|
|
md.setFaceColors(colors)
|
|
m1 = gl.GLMeshItem(meshdata=md, smooth=False, shader='balloon')
|
|
m1.setGLOptions('additive')
|
|
|
|
#w.addItem(m1)
|
|
m1.translate(-25, -25, -20)
|
|
|
|
m2 = gl.GLMeshItem(meshdata=md, smooth=True, shader='balloon')
|
|
m2.setGLOptions('additive')
|
|
|
|
w.addItem(m2)
|
|
m2.translate(-25, -25, -50)
|
|
|
|
if __name__ == '__main__':
|
|
pg.mkQApp().exec_()
|