height_field+imagemap
// uses image color index as height, extends along X-Z axes
// from <0 0 0> to <1 1 1>
height_field {
png plasma3.png
texture {
pigment {
image_map { png plasma3.png map_type 0 interpolate 2 once }
rotate x*90 // lay X-Y image map down onto X-Z height field plane
}
}
}