136 lines
3.3 KiB
Python
136 lines
3.3 KiB
Python
# -*- coding: utf-8 -*-
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"""
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Simple examples demonstrating the use of GLMeshItem.
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"""
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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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w.setCameraPosition(distance=40)
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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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## Example 1:
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## Array of vertex positions and array of vertex indexes defining faces
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## Colors are specified per-face
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verts = np.array([
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[0, 0, 0],
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[2, 0, 0],
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[1, 2, 0],
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[1, 1, 1],
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])
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faces = np.array([
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[0, 1, 2],
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[0, 1, 3],
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[0, 2, 3],
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[1, 2, 3]
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])
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colors = np.array([
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[1, 0, 0, 0.3],
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[0, 1, 0, 0.3],
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[0, 0, 1, 0.3],
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[1, 1, 0, 0.3]
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])
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## Mesh item will automatically compute face normals.
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m1 = gl.GLMeshItem(vertexes=verts, faces=faces, faceColors=colors, smooth=False)
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m1.translate(5, 5, 0)
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m1.setGLOptions('additive')
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w.addItem(m1)
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## Example 2:
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## Array of vertex positions, three per face
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## Colors are specified per-vertex
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verts = verts[faces] ## Same mesh geometry as example 2, but now we are passing in 12 vertexes
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colors = np.random.random(size=(verts.shape[0], 3, 4))
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#colors[...,3] = 1.0
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m2 = gl.GLMeshItem(vertexes=verts, vertexColors=colors, smooth=False, shader='balloon')
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m2.translate(-5, 5, 0)
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w.addItem(m2)
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## Example 3:
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## icosahedron
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md = gl.MeshData.sphere(rows=10, cols=20)
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#colors = np.random.random(size=(md.faceCount(), 4))
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#colors[:,3] = 0.3
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#colors[100:] = 0.0
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colors = np.ones((md.faceCount(), 4), dtype=float)
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colors[::2,0] = 0
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colors[:,1] = np.linspace(0, 1, colors.shape[0])
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md.setFaceColors(colors)
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m3 = gl.GLMeshItem(meshdata=md, smooth=False)#, shader='balloon')
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#m3.translate(-5, -5, 0)
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w.addItem(m3)
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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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#verts = pg.isosurface(data, data.max()/4.)
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#md = gl.MeshData.MeshData(vertexes=verts)
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#colors = np.ones((md.vertexes(indexed='faces').shape[0], 4), dtype=float)
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#colors[:,3] = 0.3
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#colors[:,2] = np.linspace(0, 1, colors.shape[0])
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#m1 = gl.GLMeshItem(meshdata=md, color=colors, smooth=False)
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#w.addItem(m1)
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#m1.translate(-25, -25, -20)
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#m2 = gl.GLMeshItem(vertexes=verts, color=colors, smooth=True)
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#w.addItem(m2)
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#m2.translate(-25, -25, -50)
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## Start Qt event loop unless running in interactive mode.
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if __name__ == '__main__':
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import sys
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if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
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QtGui.QApplication.instance().exec_()
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