search for: addnormals

...,0,1,0) # ... rotation angles theta = atan2(end[2],end[1]) # angle in yx-plane for Z-achses rotation phi = atan2(end[3],sqrt(end[1]^2+end[1]^2)) # angle in zx for Y-achses rotation # ... rotation c=rotate3d(c,phi,0,1,0) # Y-achses rotation c=rotate3d(c, -theta,0,0,1) # Z-achses rotation shade3d(addNormals(c), col=mycol) } open3d() vector3D(start=c(0,0,0),end=data[,1], 'red'); vector3D(start=c(0,0,0),end=data[,2],'green') arrow3d(c(0,0,0),data[,1],color='red');arrow3d(c(0,0,0),data[,2], color='green') axes3d(c('x','y','z'));title3d('mai...

For a paper dealing with generalized ellipsoids, I want to illustrate in 3D an ellipsoid that is unbounded in one dimension, having the shape of an infinite cylinder along, say, z, but whose cross-section in (x,y) is an ellipse, say, given by the 2x2 matrix cov(x,y). I've looked at rgl:::cylinder3d, but don't see any way to make it accomplish this. Does anyone have any ideas? thx,

There has been recent discussion about alternatives to the model-based standard error estimators for lm. While some people like the sandwich estimator and others don't, it is clear that neither estimator dominates the other for any sane loss function. It is also worth noting that the sandwich estimator is the default for t.test(). I think it would be useful for models using other

The Wine development release 2.10 is now available. What's new in this release (see below for details): - Initial version of the Android graphics driver. - Dictionary support in WebServices. - A number of Direct2D fixes. - User interface improvements in RegEdit. - OLE clipboard cache fixes. - Various bug fixes. The source is available from the following locations: