[R] add points and labels to a 3 dimensional plot

[Duncan Murdoch]

On 28/03/2014 6:51 AM, paladini at trustindata.de wrote:
> Hello,
> I want to draw  3D plot. The coordinates should  be inticated with a
> red point  and  additional I want to label them with a name.
>
> I tried this:
>    plot3d(x, y, z,xlab="PC1", ylab="PC2", zlab="PC3",main="Country
> score resemblance (Stoxx600 rated by
> Vigeo)",text3d(x=x,y=y,z=z,texts=names, col=4))
> plot3d(x, y, z, col=2, size=3, add=TRUE)

It looks as though you are using rgl.  If you found plot3d in some other 
package, then this advice might not apply.

Putting the text3d() call within the plot3d call doesn't make sense.  It 
should be a separate call.

You should probably use points3d() to add points rather than 
plot3d(add=TRUE), but there isn't really much difference.

rgl decides what is visible in a fairly complicated way.  The default is 
that things that are closer to the viewer hide things that are further 
away, but if two things are at the same distance, the first one wins.  
So I would guess that your text is hiding the red points.  It is 
possible to modify this rule using the material3d() property 
"depth_test", but I would advise against doing that.
Plot your text at a different location than your points if you don't 
want one to obscure the other.  You can use the "adj" parameter to 
text3d() to offset the text.

Duncan Murdoch


>
> and some variations of this code but in the end you see only the names
> but no red point.
>
> What did I get wrong?
>
> It would be nice if somebody can help me.
>
> Best regards and thanking you in anticipation
>
> Claudia
>
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