Thanks you for the detail announce ! -- M On Thu, Feb 23, 2017 at 4:41 AM, Bruce Sherwood <[email protected]> wrote: > There is a new version 2.0.2 of Jupyter VPython, the 3D graphics module (pip > install vpython or pip install vpython --upgrade; see vpython.org for more > details): > > * It supports extrusion and 3D text objects. > > * There are important improvements to the way compound objects work. > > * The axis and up attributes of an object are now always perpendicular to > each other. > > EXTRUSION AND 3D TEXT > The extrusion object lets you specify a 2D shape and a path along which to > extrude that shape. Here is an example and the documentation: > > > http://www.glowscript.org/#/user/GlowScriptDemos/folder/Examples/program/Extrusions > http://www.glowscript.org/docs/VPythonDocs/extrusion.html > > The text object creates an extrusion of a specified text, making 3D text > available in a scene. Here is an example and the documentation: > > > http://www.glowscript.org/#/user/GlowScriptDemos/folder/Examples/program/BillboardingText > http://www.glowscript.org/docs/VPythonDocs/text.html > > CHANGES TO COMPOUND OBJECTS > Working with compound objects in GlowScript 2.1 uncovered some significant > design issues which later versions of GlowScript addressed. Here are the > changes to the compound object, which are part of the Jupyter VPython 2.0.2 > release: > > 1) The compound object is now very similar to the box object. In GlowScript > 2.1 (and up till now in Jupyter VPython), the bounding box (size) was > vector(1,1,1), the actual bounding box was not known, and size could only be > changed multiplicatively. In later versions of GlowScript the bounding box > (size) is the actual size of the object, which can be changed by setting > size to the desired value. > > 2) Now, when you create a compound object, the value of "pos" is set to the > computed center of the object. If you specify "pos" when creating the > object, the object is moved so that its center is located at the new > location. > > 3) As with other objects such as box or cylinder, changing the axis of an > extrusion or compound object not only rotates the object but its length > (size.x) is set equal to the magnitude of the axis vector. Similarly, > changing the size sets the magnitude of the axis vector to be equal to the > length (size.x). > > Here is the documentation on the updated compound object: > > http://www.glowscript.org/docs/VPythonDocs/compound.html > > AXIS AND UP KEPT PERPENDICULAR TO EACH OTHER > Jupyter VPython 2.0.2 incorporates changes implemented in GlowScript 2.4 > that fixed a long-standing error in changing "axis" without updating "up" to > remain perpendicular to axis (and vice versa). The result was that rotating > an object by continually changing its axis could cause abrupt changes in the > appearance of the object. This was noticeable only if an object had a > texture or a compound object lacked symmetry, which is presumably why the > problem doesn't seem to have been noted for many years. > > Here is an example of a program running in GlowScript 2.3 that illustrates > the problem. Note that "up" doesn't change, and there's a problem when > "axis" and "up" point in the same direction: > > > http://www.glowscript.org/#/user/Bruce_Sherwood/folder/Pub/program/RotatingAxis2.3 > > Here is the same program running GlowScript 2.4 (or Jupyter VPython 2.0), > which works properly. Note that "axis" and "up" are always perpendicular to > each other: > > > http://www.glowscript.org/#/user/Bruce_Sherwood/folder/Pub/program/RotatingAxis2.4 > > For further details, see > > http://www.glowscript.org/docs/VPythonDocs/box.html > > GLOWSCRIPT VPYTHON CLOSER TO TRUE VPYTHON > The RapydScript Python-to-JavaScript transpiler used with GlowScript VPython > now comes closer to handling standard Python syntax, which will facilitate > moving programs between GlowScript and Juptyer environments. The new > transpiler is RapydScript-NG, developed by Kovid Goyal. For example, among > its features is that it provides most of the standard Python string methods: > capitalize, strip, lstrip, rstrip, islower, isupper, isspace, lower, upper, > swapcase, center, count, endswith, startswith, find, rfind, index, rindex, > format, join, ljust, rjust, partition, rpartition, replace, split, rsplit, > splitlines, and zfill. > > -- > You received this message because you are subscribed to the Google Groups > "Project Jupyter" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/jupyter/2485b4f8-f66a-49b6-9ce9-11f084182634%40googlegroups.com. > For more options, visit https://groups.google.com/d/optout.
-- You received this message because you are subscribed to the Google Groups "Project Jupyter" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/jupyter/CANJQusVaRbgM3EkWtrEtYQNz1dPmymyQ%2B7GDn0SrXgWTZR_ugw%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
