Error(s) in re-building vignettes:
--- re-building ‘models-from-other.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
trying URL 'http://ryantimpe.com/files/mf_unicorn.PNG'
Content type 'image/png' length 277758 bytes (271 KB)
==================================================
downloaded 271 KB

Warning in snapshot3d(paste0(name, ".png")) :
  webshot = TRUE requires the webshot2 package; using rgl.snapshot() instead
Warning in rgl.snapshot(filename, fmt, top) :
  this build of rgl does not support snapshots
--- finished re-building ‘models-from-other.Rmd’

--- re-building ‘models-from-program.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
Warning in snapshot3d(paste0(name, ".png")) :
  webshot = TRUE requires the webshot2 package; using rgl.snapshot() instead
Warning in rgl.snapshot(filename, fmt, top) :
  this build of rgl does not support snapshots
Warning in snapshot3d(paste0(name, ".png")) :
  webshot = TRUE requires the webshot2 package; using rgl.snapshot() instead
Warning in rgl.snapshot(filename, fmt, top) :
  this build of rgl does not support snapshots
Warning in snapshot3d(paste0(name, ".png")) :
  webshot = TRUE requires the webshot2 package; using rgl.snapshot() instead
Warning in rgl.snapshot(filename, fmt, top) :
  this build of rgl does not support snapshots
Warning in snapshot3d(paste0(name, ".png")) :
  webshot = TRUE requires the webshot2 package; using rgl.snapshot() instead
Warning in rgl.snapshot(filename, fmt, top) :
  this build of rgl does not support snapshots
--- finished re-building ‘models-from-program.Rmd’

--- re-building ‘models-from-tables.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
Warning in snapshot3d(paste0(name, ".png")) :
  webshot = TRUE requires the webshot2 package; using rgl.snapshot() instead
Warning in rgl.snapshot(filename, fmt, top) :
  this build of rgl does not support snapshots
Warning in snapshot3d(paste0(name, ".png")) :
  webshot = TRUE requires the webshot2 package; using rgl.snapshot() instead
Warning in rgl.snapshot(filename, fmt, top) :
  this build of rgl does not support snapshots
Warning in snapshot3d(paste0(name, ".png")) :
  webshot = TRUE requires the webshot2 package; using rgl.snapshot() instead
Warning in rgl.snapshot(filename, fmt, top) :
  this build of rgl does not support snapshots
--- finished re-building ‘models-from-tables.Rmd’

--- re-building ‘models-piece-type.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
Warning in snapshot3d(paste0(name, ".png")) :
  webshot = TRUE requires the webshot2 package; using rgl.snapshot() instead
Warning in rgl.snapshot(filename, fmt, top) :
  this build of rgl does not support snapshots
Warning in snapshot3d(paste0(name, ".png")) :
  webshot = TRUE requires the webshot2 package; using rgl.snapshot() instead
Warning in rgl.snapshot(filename, fmt, top) :
  this build of rgl does not support snapshots
Warning in snapshot3d(paste0(name, ".png")) :
  webshot = TRUE requires the webshot2 package; using rgl.snapshot() instead
Warning in rgl.snapshot(filename, fmt, top) :
  this build of rgl does not support snapshots
Warning in snapshot3d(paste0(name, ".png")) :
  webshot = TRUE requires the webshot2 package; using rgl.snapshot() instead
Warning in rgl.snapshot(filename, fmt, top) :
  this build of rgl does not support snapshots
Warning in snapshot3d(paste0(name, ".png")) :
  webshot = TRUE requires the webshot2 package; using rgl.snapshot() instead
Warning in rgl.snapshot(filename, fmt, top) :
  this build of rgl does not support snapshots
Warning in snapshot3d(paste0(name, ".png")) :
  webshot = TRUE requires the webshot2 package; using rgl.snapshot() instead
Warning in rgl.snapshot(filename, fmt, top) :
  this build of rgl does not support snapshots
Warning in snapshot3d(paste0(name, ".png")) :
  webshot = TRUE requires the webshot2 package; using rgl.snapshot() instead
Warning in rgl.snapshot(filename, fmt, top) :
  this build of rgl does not support snapshots
Warning in snapshot3d(paste0(name, ".png")) :
  webshot = TRUE requires the webshot2 package; using rgl.snapshot() instead
Warning in rgl.snapshot(filename, fmt, top) :
  this build of rgl does not support snapshots
Warning in snapshot3d(paste0(name, ".png")) :
  webshot = TRUE requires the webshot2 package; using rgl.snapshot() instead
Warning in rgl.snapshot(filename, fmt, top) :
  this build of rgl does not support snapshots
--- finished re-building ‘models-piece-type.Rmd’

--- re-building ‘mosaics.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
trying URL 'http://ryantimpe.com/files/mf_unicorn.PNG'
Content type 'image/png' length 277758 bytes (271 KB)
==================================================
downloaded 271 KB

Quitting from lines 68-78 (mosaics.Rmd) 
Error: processing vignette 'mosaics.Rmd' failed with diagnostics:
polygon edge not found
--- failed re-building ‘mosaics.Rmd’

SUMMARY: processing the following file failed:
  ‘mosaics.Rmd’

Error: Vignette re-building failed.
Execution halted