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pglyph3D<-function(aglyph, M=diag(1, nrow=4), M2=diag(1, nrow=4) , anorms=list() , zee=c(0,0,1), col="white", border="black")
{
if(missing(M)) { M = diag(1, nrow=4) }
if(missing(M2)) { M2 = diag(1, nrow=4) }
if(missing(col)) { col="white" }
if(missing(border)) { border="black" }
if(missing(zee)) { zee=c(0,0,1) }
if(missing(anorms))
{
anorms = list()
for(i in 1:length(aglyph))
{
XX = RSEIS::xprod(aglyph[[i]][3,]-aglyph[[i]][2,], aglyph[[i]][2,]-aglyph[[i]][1,])
print(paste(sep=' ', c(i, XX) ))
anorms[[i]] = XX
}
}
bglyph = list()
bvec = vector()
for( i in 1:length(aglyph))
{
Xt = cbind(aglyph[[i]], 1) %*% M
#### get cross product of second vector versus first
######### vectors should be oriented so this points out from object
### XX = RSEIS::xprod( Xt[2,]-Xt[1,], Xt[3,]-Xt[2,])
XX = c(anorms[[i]], 1) %*% M2
## print(XX[3] )
## if(XX[3]>0) polygon(Xt[,1], Xt[,2], col="white", border="black")
###### get depth of faces
zd = mean(Xt[,3])
bvec[i] = zd
bglyph[[i]] = list(x=Xt[,1], y= Xt[,2], xp=XX, zd=zd )
}
for( i in order(bvec))
{
zdot = (bglyph[[i]]$xp[1]*zee[1]+bglyph[[i]]$xp[2]*zee[2]+bglyph[[i]]$xp[3]*zee[3] )
### print(c( i, bvec[i], bglyph[[i]]$xp, zdot))
if(zdot>=0) polygon(bglyph[[i]]$x,bglyph[[i]]$y, col=col, border=border, xpd=TRUE)
### polygon(bglyph[[i]]$x,bglyph[[i]]$y, col=NA, border=grey(0.8))
}
}
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