Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.graphics.apps.gnuplot > #3358

Re: Strange Mobius strip in rendering a cylinder with pm3d

Show all headers | View raw

Am 28.06.2016 um 06:43 schrieb musiphil@bawi.org:

> splot "data" using (3*cos($1)):(2*sin($1)):2:3 palette with pm3d notitle
>
> where "data" is generated by the following program (made up for illustrative purposes):

[...]

Just FTR, there's not really a need to use a datafile to get that effect:

	set parametric
	splot [h=0:1][phi=-pi:pi] cos(phi),sin(phi),h w pm3d

And the root cause is quite simple: pm3d doesn't actually respect the 
screen z coordinate (i.e. front-to-back) by default.  It draws the 
patches of colour in the same order they have in your input.  And yes, 
that drawing order is quite wrong in a large fraction of possible 
orientations of this particular surface.

The solution is to read "help pm3d" and find out about "depthorder".

Back to comp.graphics.apps.gnuplot | Previous | Next — Previous in thread | Next in thread | Find similar

Thread

Strange Mobius strip in rendering a cylinder with pm3d musiphil@bawi.org - 2016-06-27 21:43 -0700
  Re: Strange Mobius strip in rendering a cylinder with pm3d Michael Okuntsov <okuntsov.mikhail@yandex.ru> - 2016-06-28 16:20 +0700
    Re: Strange Mobius strip in rendering a cylinder with pm3d musiphil@bawi.org - 2016-06-28 09:46 -0700
    Re: Strange Mobius strip in rendering a cylinder with pm3d musiphil@bawi.org - 2016-06-28 10:27 -0700
  Re: Strange Mobius strip in rendering a cylinder with pm3d Hans-Bernhard Bröker <HBBroeker@t-online.de> - 2016-06-29 00:04 +0200
    Re: Strange Mobius strip in rendering a cylinder with pm3d musiphil@bawi.org - 2016-07-03 18:47 -0700

csiph-web