i get different results by declaring or not a camera
povray3.5b10.icl win2000 Atlhon900MHz 256Mb
M
/*
camera
{
location <0, 0, -3>
right x
up y
direction z
}
*/
#declare cam=camera
{
location <0, 0, -3>
right x
up y
direction z
}
camera {cam}
sphere { 0, 1 pigment { color rgb 1 } finish { ambient 1 } }
