<table cellspacing="0" cellpadding="0" border="0" ><tr><td valign="top" style="font: inherit;"><DIV>I have a volume data set which are rendered in two different mappers: vtkVolumeRayCastMapper (upper image in the attachment) and vtkDataSetMapper (lower image). I am wondering why vtkVolumeRayCastMapper image lost some outer layers and became smaller. This happens for thin-slab objects very often. Thanks.</DIV></td></tr></table><br>