This 3D model was originally created with Sketchup 8 and then converted to all other 3D formats. Native format is .skp 3dsmax scene is 3ds Max 2016 version, rendered with Vray 3.00 I found this was a good way to learn making heads in 3d... it helped me with only a half to work on... I can not claim any credit for this 3D Head as it was done in 3d Max.. and when I find out who made it I will gladley give them a credit mention... the mould idea was mine and simply select the head in the mould and copy... then paste it where you want... make a group and copy again... paste in place... and flip along red line to make a full 3D Head pushing them together ... there is no seam line... it dose not matter if you mess it up just make another...