pystl
Can someone deliver a minimal, fully working example with the pystl module, https://pypi.python.org/pypi/pystl/ The only example code mentioned is the following: with PySTL(‘stl_test.stl’) as stl: stl.add_triangle( (0.0, 0.0, 0.5), (0.0, 1.0, 0.0), (1.0, 1.0, 0.5) ) but no matter what 'import'-statement I try I cannot make it work. I have installed the module and a program containing only the following line from pystl import PySTL runs without any error message. Poul Riis -- https://mail.python.org/mailman/listinfo/python-list
Re: pystl
I tried the following:
from pystl import PySTL
with PySTL('stl_test.stl') as stl:
stl.add_triangle((0,0,0),(1,0,0),(0,1,0))
I got the following error message:
Traceback (most recent call last):
File
"C:/Users/pr/AppData/Local/Programs/Python/Python35-32/Lib/idlelib/pystl_module_test_1.py",
line 3, in
with PySTL('stl_test.stl') as stl:
File
"c:\users\pr\appdata\local\continuum\anaconda3\lib\site-packages\pystl\pystl.py",
line 62, in __enter__
self.write_stl_header()
File
"c:\users\pr\appdata\local\continuum\anaconda3\lib\site-packages\pystl\pystl.py",
line 75, in write_stl_header
self.f.write(struct.pack("80s", header_str))
struct.error: argument for 's' must be a bytes object
Poul Riis
Den onsdag den 17. august 2016 kl. 08.49.29 UTC+2 skrev Steven D'Aprano:
> On Wednesday 17 August 2016 16:36, Poul Riis wrote:
>
> > Can someone deliver a minimal, fully working example with the pystl module,
> > https://pypi.python.org/pypi/pystl/
> >
> > The only example code mentioned is the following:
> >
> > with PySTL(‘stl_test.stl’) as stl:
> > stl.add_triangle( (0.0, 0.0, 0.5), (0.0, 1.0, 0.0), (1.0, 1.0, 0.5) )
> >
> >
> > but no matter what 'import'-statement I try I cannot make it work.
>
> Don't make us guess. What have you tried, and what happens when you do? Cut
> and
> paste the *actual* code you try, and the *actual* results.
>
> http://mattgemmell.com/what-have-you-tried/
>
> http://www.sscce.org/
>
>
> > I have installed the module and a program containing only the following line
> >
> > from pystl import PySTL
> >
> > runs without any error message.
>
> Great. Then try this:
>
> from pystl import PySTL
> with PySTL(‘stl_test.stl’) as stl:
> stl.add_triangle( (0.0, 0.0, 0.5), (0.0, 1.0, 0.0), (1.0, 1.0, 0.5) )
>
>
>
> If it doesn't work, what does it do?
>
>
>
> --
> Steve
--
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Making stl files with python for 3d printing
Below you can find my python code to make a vase for 3D-printing.
The vase looks nice on my screen so the vertices and the faces seem to be
perfect.
However, when sending the .stl file produced to a 3D-printer the vase comes out
as a filled solid - no room for water and flowers!
I have tried to slice the vase the the program "Cura". It seems that the slices
are full disks, not rings as intended, at some values of z but far from all.
I don't expect anybody to read the full program (I'm a very poor programmer)
but my hope is that someone can give a hint as to how I can improve the writing
of the .stl file.
Poul Riis
#!/usr/bin/env python
#coding:utf-8
# Purpose: Export 3D objects, build of faces with 3 or 4 vertices, as ASCII or
Binary STL file.
# License: MIT License
import struct
from tvtk.api import tvtk
from mayavi import mlab
from math import *
from sympy import *
ASCII_FACET = """facet normal 0 0 0
outer loop
vertex {face[0][0]:.4f} {face[0][1]:.4f} {face[0][2]:.4f}
vertex {face[1][0]:.4f} {face[1][1]:.4f} {face[1][2]:.4f}
vertex {face[2][0]:.4f} {face[2][1]:.4f} {face[2][2]:.4f}
endloop
endfacet
"""
BINARY_HEADER ="80sI"
BINARY_FACET = "12fH"
class ASCII_STL_Writer:
""" Export 3D objects build of 3 or 4 vertices as ASCII STL file.
"""
def __init__(self, stream):
self.fp = stream
self._write_header()
def _write_header(self):
self.fp.write("solid python\n")
def close(self):
self.fp.write("endsolid python\n")
def _write(self, face):
self.fp.write(ASCII_FACET.format(face=face))
def _split(self, face):
p1, p2, p3, p4 = face
return (p1, p2, p3), (p3, p4, p1)
def add_face(self, face):
""" Add one face with 3 or 4 vertices. """
if len(face) == 4:
face1, face2 = self._split(face)
self._write(face1)
self._write(face2)
elif len(face) == 3:
self._write(face)
else:
raise ValueError('only 3 or 4 vertices for each face')
def add_faces(self, faces):
""" Add many faces. """
for face in faces:
self.add_face(face)
class Binary_STL_Writer(ASCII_STL_Writer):
""" Export 3D objects build of 3 or 4 vertices as binary STL file.
"""
def __init__(self, stream):
self.counter = 0
super(Binary_STL_Writer, self).__init__(stream)
def close(self):
self._write_header()
def _write_header(self):
self.fp.seek(0)
self.fp.write(struct.pack(BINARY_HEADER, b'Python Binary STL Writer',
self.counter))
def _write(self, face):
self.counter += 1
data = [
0., 0., 0.,
face[0][0], face[0][1], face[0][2],
face[1][0], face[1][1], face[1][2],
face[2][0], face[2][1], face[2][2],
0
]
self.fp.write(struct.pack(BINARY_FACET, *data))
def example(fn):
def get_cube():
p=[]
nxy=24
nz=21#Must be odd
unit=10
h=2*unit
dh=h/nz
zbottom=-2*dh
thickness=0.3*unit
z=Symbol('z')
f=1*(1+sin((z/h)**2*1*pi)/8)*exp(z/h/2)*unit#1*
#f=(1+z/h)*unit
flambdified = lambdify(z, f)
fdiff=f.diff(z)
fdifflambdified = lambdify(z, fdiff)
rinner0=10
rinner=rinner0
router0=rinner0+thickness
router=router0
deltar=1
deltaphi=2*pi/nxy
deltaphih=deltaphi/2
nxyz=nxy*nz
npts=0
#Inner:
for j in range(0,nz+1):
zact=j*dh
ract=flambdified(zact)
phiact=j%2*(-deltaphih)
for i in range(0,nxy):
p.append((ract*cos(phiact),ract*sin(phiact),zact))
phiact=phiact+deltaphi
npts=npts+1
npts1=npts
#Middle of upper rim:
phiact=0
ract=flambdified(zact)
a=fdifflambdified(zact)
b=sqrt(1+a*a)
k=thickness/b/2
for i in range(0,nxy):
cosphi=cos(phiact)
sinphi=sin(phiact)
dx=k*cosphi
dy=k*sinphi
dz=-k*a
p.append((ract*cosphi+dx,ract*sinphi+dy,zact+dz))
phiact=phiact+deltaphi
npts1=npts1+1
#Outer:
for j in range(-1,nz+2):
zact=(nz-j-1)*dh
ract=flambdified(zact)
a=fdifflambdified(zact)
b=sqrt(1+a*a)
k=thickness/b
phiact=(j-0)%2*(-deltaphih)
for i in range(0,nxy):
cosphi=cos(phiact)
sinphi=sin(phiact)
dx=k*cosphi
Re: Making stl files with python for 3d printing
Den mandag den 14. november 2016 kl. 05.55.20 UTC+1 skrev Gregory Ewing: > Poul Riis wrote: > > However, when sending the .stl file produced to a 3D-printer the vase comes > > out as a filled solid - no room for water and flowers! > > My guess is that you have a problem with the orientation > of your faces. The inner surface needs to have its triangles > oriented so that their "outside" direction is towards the > centre of the vase. > > If you generate the inner surface using the same code as > the outer surface and just change the radius, you will > end up with both surfaces oriented outwards, which would > produce the effect you describe. > > -- > Greg You are right - thank you so much! Poul Riis -- https://mail.python.org/mailman/listinfo/python-list
Partitioning a list
I would like to list all possible ways to put N students in groups of k students (suppose that k divides N) with the restriction that no two students should ever meet each other in more than one group. I think this is a classical problem and I think there must be a python solution out there but I cannot find it. For instance, numpy's array_split only lists one (trivial) split. I would be happy if someone could refer me to a general python algorithm solving the problem. Poul Riis -- https://mail.python.org/mailman/listinfo/python-list
Re: Partitioning a list
I find it surprisingly difficult to find information on this issue on the internet. Until now I've only found this preview of an article: https://www.jstor.org/stable/3615434?seq=1#page_scan_tab_contents Still, I can hardly believe that nobody has made some efforts to make a python algorithm to solve this classical problem so I'm still hoping -- https://mail.python.org/mailman/listinfo/python-list
sympy
Is it possible to transfer results from sympy to 'normal' python.
In the case below I think my intention is clear enough but it does not work as
intended. How can it be done?
Poul Riis
from sympy import *
x=Symbol('x')
ftext=diff(1/(x**2+1),x)
def f(t):
return ftext.subs(x,'t')
print(f(3))
--
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Re: sympy
What I intend to do is to let sympy find the derivative of some welldefined function and next define the foundation derivative as a normal function so that I can calculate numerical values or even make a graph. -- https://mail.python.org/mailman/listinfo/python-list
Re: sympy
Den torsdag den 31. marts 2016 kl. 06.49.34 UTC+2 skrev Gregory Ewing:
> Steven D'Aprano wrote:
> > On Thu, 31 Mar 2016 02:23 am, Poul Riis wrote:
> >
> >>What I intend to do is to let sympy find the derivative of some
> >>welldefined function and next define the foundation derivative as a normal
> >>function
> >
> > py> ftext.evalf(subs={x:3})
> > -0.0600
>
> Given all that, it looks like you want
>
> def f(t):
> return ftext.evalf(subs={x:t})
>
> --
> Greg
Oh, yes, that works! Thank you!
Poul Riis
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Re: sympy
Den onsdag den 30. marts 2016 kl. 17.59.49 UTC+2 skrev Steven D'Aprano:
> On Thu, 31 Mar 2016 02:23 am, Poul Riis wrote:
>
> > What I intend to do is to let sympy find the derivative of some
> > welldefined function and next define the foundation derivative as a normal
> > function so that I can calculate numerical values or even make a graph.
>
>
> I'm glad you explained what you *actually* wanted, because I was going to
> guess that you wanted to evaluate the derivative at x = 3:
>
>
> py> ftext.evalf(subs={x:3})
> -0.0600
>
>
>
> --
> Steven
... However, the sympy way seems to be about 70 times slower than using the
derivative calculated 'by hand' (try the example below).
Can it be done in a more efficient way?
Poul Riis
from sympy import *
from time import *
x=Symbol('x')
ftext=diff(sin(x),x)
def fmsympy(t):
return ftext.evalf(subs={x:t})
def fm(t):
return cos(t)
nloop=1
tstart=time()
# nloop evaluations with sympy
for i in range(0,nloop):
a=fmsympy(1)
dt1=time()-tstart
# nloop evaluations without sympy
tstart=time()
for i in range(0,nloop):
a=fm(1)
dt2=time()-tstart
print(nloop,' evaluations with sympy : dt1 =',dt1)
print(nloop,' evaluations without sympy: dt2 =',dt2)
--
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Re: sympy
Den onsdag den 30. marts 2016 kl. 13.17.33 UTC+2 skrev Poul Riis:
> Is it possible to transfer results from sympy to 'normal' python.
>
> In the case below I think my intention is clear enough but it does not work
> as intended. How can it be done?
>
> Poul Riis
>
>
>
>
> from sympy import *
> x=Symbol('x')
> ftext=diff(1/(x**2+1),x)
>
> def f(t):
> return ftext.subs(x,'t')
>
> print(f(3))
Well, cos(1) should have been cos(1.0) (which forces numerical evaluation, try
example below).
I am just trying to implement one little thing that all CAS tools can do in a
few lines, namely finding the derivative of a given function followed by
evalution of numerical values, something like:
define(fm(x),diff(f(x),x))
fm(1.0)
Sympy can find the derivative, and once that has been completed I would expect
that there is some way to find numerical values just as fast as if the
derivative had been given 'by hand'. But how exactly?
Poul Riis
from sympy import *
from time import *
x=Symbol('x')
ftext=diff(sin(x),x)
def fmsympy(t):
return ftext.evalf(subs={x:t})
def fm(t):
return cos(t)
nloop=1
tstart=time()
for i in range(0,nloop):
a=fmsympy(1)
dt1=time()-tstart
print(a)
tstart=time()
for i in range(0,nloop):
a=fm(1.0)
dt2=time()-tstart
print(a)
print(nloop,' evaluations with sympy : dt1 =',dt1)
print(nloop,' evaluations without sympy: dt2 =',dt2)
--
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Animations with mayavi and moviepy
The animation example below (taken from
http://zulko.github.io/blog/2014/11/29/data-animations-with-python-and-moviepy/)
stops after producing and displaying the 41 frames. In stead, after producing
the 41 frames I want to make it loop continuously. I have googled and googled
and googled and still not found out how to do it. I guess that it is very
simple but how?
The program prints out some rather uninteresting information - how can I
suppress that?
Poul Riis
import numpy as np
import mayavi.mlab as mlab
import moviepy.editor as mpy
duration= 2 # duration of the animation in seconds (it will loop)
# MAKE A FIGURE WITH MAYAVI
fig_myv = mlab.figure(size=(220,220), bgcolor=(1,1,1))
X, Y = np.linspace(-2,2,200), np.linspace(-2,2,200)
XX, YY = np.meshgrid(X,Y)
ZZ = lambda d: np.sinc(XX**2+YY**2)+np.sin(XX+d)
# ANIMATE THE FIGURE WITH MOVIEPY, WRITE AN ANIMATED GIF
def make_frame(t):
mlab.clf() # clear the figure (to reset the colors)
mlab.mesh(YY,XX,ZZ(2*np.pi*t/duration), figure=fig_myv)
return mlab.screenshot(antialiased=True)
animation = mpy.VideoClip(make_frame, duration=duration)
animation.write_gif("sinc.gif", fps=20)
--
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Cairo module
I just tried the Cairo Python module.
I ran the test file below.
It works perfectly but instead of saving the resulting image as a file I want
to see it displayed directly on the screen.
How can I do that?
Poul Riis
import math
import cairo
WIDTH, HEIGHT = 256, 256
surface = cairo.ImageSurface (cairo.FORMAT_ARGB32, WIDTH, HEIGHT)
ctx = cairo.Context (surface)
ctx.scale (WIDTH, HEIGHT) # Normalizing the canvas
pat = cairo.LinearGradient (0.0, 0.0, 0.0, 1.0)
pat.add_color_stop_rgba (1, 0.7, 0, 0, 0.5) # First stop, 50% opacity
pat.add_color_stop_rgba (0, 0.9, 0.7, 0.2, 1) # Last stop, 100% opacity
ctx.rectangle (0, 0, 1, 1) # Rectangle(x0, y0, x1, y1)
ctx.set_source (pat)
ctx.fill ()
ctx.translate (0.1, 0.1) # Changing the current transformation matrix
ctx.move_to (0, 0)
ctx.arc (0.2, 0.1, 0.1, -math.pi/2, 0) # Arc(cx, cy, radius, start_angle,
stop_angle)
ctx.line_to (0.5, 0.1) # Line to (x,y)
ctx.curve_to (0.5, 0.2, 0.5, 0.4, 0.2, 0.8) # Curve(x1, y1, x2, y2, x3, y3)
ctx.close_path ()
ctx.set_source_rgb (0.3, 0.2, 0.5) # Solid color
ctx.set_line_width (0.02)
ctx.stroke ()
surface.write_to_png ("example.png") # Output to PNG
--
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Re: Cairo module
Could you be a little more specific (giving, for instance, a full working example)? I tried to interchange surface = cairo.ImageSurface (cairo.FORMAT_ARGB32, WIDTH, HEIGHT) with surface = cairo.Win32Surface (cairo.FORMAT_ARGB32, WIDTH, HEIGHT) but that didn't seem to work. Could matplotlib be used to show the image? Poul Riis -- https://mail.python.org/mailman/listinfo/python-list
pyqtgraph window position
I can control the size of my pyqtgraph window below with 'resize'.
But how can I control the position on the screen?
Poul Riis
import pyqtgraph as pg
w = pg.GraphicsWindow()
w.resize(250,400)
for i in range(4):
w.addPlot(0, i)
def onClick(event):
but=event.button()
print("but: ",but)
w.scene().sigMouseClicked.connect(onClick)
--
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Re: pyqtgraph window position
Den lørdag den 14. februar 2015 kl. 06.59.20 UTC+1 skrev Cousin Stanley: > > I can control the size of my pyqtgraph window below with 'resize'. > > > > But how can I control the position on the screen? > > > > Also, try > > w.setGeometry( x_pos , y_pos , width , height ) > > > -- > Stanley C. Kitching > Human Being > Phoenix, Arizona Thanks a lot. And how can I control the position of the secondary window in the example below? And how can I make a keyboard interrupt? Poul Riis import pyqtgraph as pg from math import * from time import * import numpy as np win = pg.GraphicsWindow(title="Basic plotting examples") #win.resize(1000,600) win.setGeometry(0,100, 1000,600 ) xx=[] yy=[] datanp = np.random.normal(size=(10,20)) ptr=0 for i in range(0,25): xx.append(i) yy.append(i*i/25.0) xarray=np.array(xx) pw=pg.plot(xx,yy,pen='r') p1 = win.addPlot(title="Extra window") p1.plot(xx,yy,pen='b') j=0 while True: j=j+1 yyy=[] for ii in range(0,len(yy)): yyy.append(sin(pi*(j-ii)/25)*yy[ii]) yarray=np.array(yyy) pw.plot(xarray, yarray, clear=True) pg.QtGui.QApplication.processEvents() -- https://mail.python.org/mailman/listinfo/python-list
guiqwt
How can I control the size of the window in the example below? Poul Riis import numpy as np from guiqwt import pyplot as plt_ x = np.arange(0,20,0.1) y = np.cos(x) plt_.figure(1) plt_.plot(x,y,'r-') plt_.show() -- https://mail.python.org/mailman/listinfo/python-list
repeat until keypressed
In good old pascal there was this one-liner command:
repeat until keypressed
Apparently there is no built-in analogue for that in python. I have explored
several different possibilities (pyglet, keyboard, curses, ginput (from
matplotlib) and others) but not managed to find anything that works the way I
want.
In the following example I just want to replace 'waitforbuttonpress' with
something like 'continueuntilbuttonpress' if such a command exists. It could be
a mouseclick or a keystroke from the terminal, for instance 'shift', 'space'
or some character.
Poul Riis
import warnings
warnings.filterwarnings("ignore",".*GUI is implemented.*")
from pylab import *
ion()
plot1=subplot(2,1,1)
plot2=subplot(2,1,2)
for i in range(20):
plot1.plot([20*(sin(i/10)+1)],[cos(i/10)],'bo')
### The following two lines should be replaced by
### something like "Go on until some key is pressed - then break"
if plt.waitforbuttonpress():
break
pause(0.1)
draw()
for i in range(20):
plot2.plot([20*(sin(i/10)+1)],[-cos(i/10)],'ro')
pause(0.1)
draw()
ioff()
--
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numpy not working any more
For some time I have been using python 3.6.0 on a windows computer. Suddenly, my numpy does not work any more. This one-liner program: import numpy as np results in the long error message below. In an effort to solve the problem I tried to install python 3.6.2 followed by all the modules I need. Here, there was no problem with numpy but then another problem appeared: Installing mayavi apparently needs vtk but pip couldn't find an acceptable vtk version. What is the easiest way to make things work again? Poul Riis Traceback (most recent call last): File "C:\Users\pr\AppData\Local\Programs\Python\Python36\lib\site-packages\numpy\core\__init__.py", line 16, in from . import multiarray ImportError: DLL load failed: Den angivne procedure blev ikke fundet. During handling of the above exception, another exception occurred: Traceback (most recent call last): File "C:/pr/python/numpy_test.py", line 1, in import numpy as np File "C:\Users\pr\AppData\Local\Programs\Python\Python36\lib\site-packages\numpy\__init__.py", line 142, in from . import add_newdocs File "C:\Users\pr\AppData\Local\Programs\Python\Python36\lib\site-packages\numpy\add_newdocs.py", line 13, in from numpy.lib import add_newdoc File "C:\Users\pr\AppData\Local\Programs\Python\Python36\lib\site-packages\numpy\lib\__init__.py", line 8, in from .type_check import * File "C:\Users\pr\AppData\Local\Programs\Python\Python36\lib\site-packages\numpy\lib\type_check.py", line 11, in import numpy.core.numeric as _nx File "C:\Users\pr\AppData\Local\Programs\Python\Python36\lib\site-packages\numpy\core\__init__.py", line 26, in raise ImportError(msg) ImportError: Importing the multiarray numpy extension module failed. Most likely you are trying to import a failed build of numpy. If you're working with a numpy git repo, try `git clean -xdf` (removes all files not under version control). Otherwise reinstall numpy. Original error was: DLL load failed: Den angivne procedure blev ikke fundet. -- https://mail.python.org/mailman/listinfo/python-list
Re: numpy not working any more
Den tirsdag den 15. august 2017 kl. 07.29.05 UTC+2 skrev dieter: > Poul Riis writes: > > ... > > For some time I have been using python 3.6.0 on a windows computer. > > Suddenly, my numpy does not work any more. > > This one-liner program: > > import numpy as np > > results in the long error message below. > > ... > > Traceback (most recent call last): > > File > > "C:\Users\pr\AppData\Local\Programs\Python\Python36\lib\site-packages\numpy\core\__init__.py", > > line 16, in > > from . import multiarray > > ImportError: DLL load failed: Den angivne procedure blev ikke fundet. > > Apparently, the module "multiarry" is implemented in a separate > DLL (= "Dynamically Loaded Library") and loading this DLL failed. > > There can be several reasons for such a failure, among others: > > * the DLL is missing > > * the DLL is corrupted > > * the DLL depends on something which is missing or corrupted > > * there is a version mismatch (e.g. between the DLL and the Python >trying to load it) > > > An initial step could be to try to reinstall "numpy" and > see whether the problem goes away. I have reinstalled numpy several times - doesn't help. -- https://mail.python.org/mailman/listinfo/python-list
Re: numpy not working any more
Den tirsdag den 15. august 2017 kl. 19.19.15 UTC+2 skrev bream...@gmail.com: > On Tuesday, August 15, 2017 at 5:23:29 PM UTC+1, Poul Riis wrote: > > Den tirsdag den 15. august 2017 kl. 07.29.05 UTC+2 skrev dieter: > > > Poul Riis writes: > > > > ... > > > > For some time I have been using python 3.6.0 on a windows computer. > > > > Suddenly, my numpy does not work any more. > > > > This one-liner program: > > > > import numpy as np > > > > results in the long error message below. > > > > ... > > > > Traceback (most recent call last): > > > > File > > > > "C:\Users\pr\AppData\Local\Programs\Python\Python36\lib\site-packages\numpy\core\__init__.py", > > > > line 16, in > > > > from . import multiarray > > > > ImportError: DLL load failed: Den angivne procedure blev ikke fundet. > > > > > > Apparently, the module "multiarry" is implemented in a separate > > > DLL (= "Dynamically Loaded Library") and loading this DLL failed. > > > > > > There can be several reasons for such a failure, among others: > > > > > > * the DLL is missing > > > > > > * the DLL is corrupted > > > > > > * the DLL depends on something which is missing or corrupted > > > > > > * there is a version mismatch (e.g. between the DLL and the Python > > >trying to load it) > > > > > > > > > An initial step could be to try to reinstall "numpy" and > > > see whether the problem goes away. > > > > I have reinstalled numpy several times - doesn't help. > > The short answer is you need to upgrade Python, not numpy. > > For the long answer please see > https://stackoverflow.com/questions/44537131/numpy-library-importerror-dll-load-failed-the-specified-procedure-could-not-be > which in turn refers to https://bugs.python.org/issue29943. > > Kindest regards. > > Mark Lawrence. I mentioned in my original question that I have tried Python 3.6.2 and that it indeed had no problems with numpy but that it on the other hand gave rize to another problem, namely failing installation of vtk (pip says 'Couldn't find a version that satisfies the requirement vtk'. Poul Riis -- https://mail.python.org/mailman/listinfo/python-list
Near and far clip plane in glowscript
Yes, I know that this is not the right forum to present my problem but I have tried the glowscript forum without succes. A different programming language, PyWeb3D, has this simple command to control the distances from the camera to the near and far planes: camera=PerspectiveCamera( 45, width / height, 1, 1000 ) where 1 is the distance to the near plane and 1000 is the distance to the far plane. - see https://threejs.org/docs/index.html?q=perspec#api/en/cameras/PerspectiveCamera I am convinced that there must be a similar way to control these parameters from glowscript because it is obvious that they are set to some default values because I see objects disappear in some cases. But I have no idea how!?!? I suspect it has to to with WebGL and how to reach WebGL commands from glowscript. What I hope is that someone at this forum can give a little hint as to get closer to a solution. It would make me very, very happy! Poul Riis Denmark -- https://mail.python.org/mailman/listinfo/python-list
