drawScene.rgl: no visible global function definition for 'rgl.cur'
drawScene.rgl: no visible global function definition for 'open3d'
drawScene.rgl: no visible global function definition for 'clear3d'
drawScene.rgl: no visible global function definition for 'triangles3d'
image3d: no visible global function definition for 'quantile'
image3d: no visible global function definition for 'heat.colors'
image3d: no visible global function definition for 'clear3d'
image3d: no visible global function definition for 'runif'
image3d: no visible global function definition for 'sprites3d'
image3d: no visible global function definition for 'points3d'
interpolateVertexColors: no visible global function definition for
  'rgb'
kde3d: no visible binding for global variable 'dnorm'
perspLighting: no visible global function definition for 'col2rgb'
perspLighting: no visible global function definition for 'rgb'
phongLighting: no visible global function definition for 'col2rgb'
phongLighting: no visible global function definition for 'rgb'
render.standard: no visible global function definition for 'plot'
render.standard: no visible global function definition for 'polygon'
renderScene: no visible global function definition for 'col2rgb'
renderScene: no visible global function definition for 'rgb'
saveTrianglesAsASY: no visible global function definition for 'col2rgb'
saveTrianglesAsIDTF: no visible global function definition for
  'col2rgb'
slices3d: no visible global function definition for 'gray.colors'
slices3d : mkimg : f: no visible global function definition for 'par'
slices3d : mkimg : f: no visible global function definition for 'image'
slices3d : mkimg : f: no visible global function definition for 'lines'
slices3d : mkimg: no visible global function definition for 'tkrplot'
slices3d : mkscale : f: no visible global function definition for
  'tclvalue'
slices3d : mkscale : f: no visible global function definition for
  'tkrreplot'
slices3d : mkscale : f: no visible global function definition for
  'tkconfigure'
slices3d : mkscale: no visible global function definition for 'tkframe'
slices3d : mkscale: no visible global function definition for 'tkscale'
slices3d : mkscale: no visible global function definition for 'tklabel'
slices3d : mkscale: no visible global function definition for 'tkgrid'
slices3d : move: no visible global function definition for 'tkbind'
slices3d : move : <anonymous>: no visible global function definition
  for 'tkwinfo'
slices3d : move : <anonymous>: no visible global function definition
  for 'tkrreplot'
slices3d : move : <anonymous>: no visible global function definition
  for 'tclvalue<-'
slices3d : overlay: no visible global function definition for 'col2rgb'
slices3d : overlay: no visible global function definition for 'rgb'
slices3d: no visible global function definition for 'tktoplevel'
slices3d: no visible global function definition for 'tktitle<-'
slices3d: no visible binding for global variable 'tclVar'
slices3d: no visible global function definition for 'tkgrid'
vertexColors: no visible global function definition for 'col2rgb'
Undefined global functions or variables:
  clear3d col2rgb dnorm gray.colors heat.colors image lines open3d par
  plot points3d polygon quantile rgb rgl.cur runif sprites3d tclVar
  tclvalue tclvalue<- tkbind tkconfigure tkframe tkgrid tklabel tkrplot
  tkrreplot tkscale tktitle<- tktoplevel tkwinfo triangles3d
Consider adding
  importFrom("grDevices", "col2rgb", "gray.colors", "heat.colors", "rgb")
  importFrom("graphics", "image", "lines", "par", "plot", "polygon")
  importFrom("stats", "dnorm", "quantile", "runif")
to your NAMESPACE file.