Re: [R] lattice (panel.3dscatter): how to make plot symbol thicker?

From: Deepayan Sarkar <deepayan.sarkar_at_gmail.com>
Date: Fri, 01 Apr 2011 18:34:51 +0530

On Fri, Mar 11, 2011 at 12:29 PM, Marius Hofert <m_hofert_at_web.de> wrote:
> Dear Deepayan,
>
> many thanks for answering.
>
> Another thing I am wondering is the following: I know you can have (3d-like) "crosses" in the wireframe plot. But are there any other 3d-like plot symbols? Of course one can use different colors to distinguish between several points. The problem is that most of the scientific journals do not allow colors [or it's expensive]. I am thus wondering if the plot symbols have equivalent 3d-versions. It looks a bit odd to draw a 2d cross in a 3d wireframe. Or a circle. Concerning the circle, it could be a small ball in 3d for example. Is there anything like this?
>

No, at least not easily. The 3D crosses are done by mapping each point into 3 perpendicular line segments, then projecting the endpoints into the 2D space, and then joining them. This is hardcoded in panel.3dscatter() -- search for the section inside 'if (cross)'. For other 3D plotting characters, you need to replicate this process (which is not really that difficult, but a bit tedious).

If you are going to be doing a lot of fancy 3D graphics, I would strongly suggest considering rgl, which is a "real" 3D graphics system. Proper 3D graphics are difficult in systems based on vector graphics (like R graphics).

-Deepayan



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