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On 2-8-2011 0:29, Christian Froeschlin wrote:
> Instead of averaging with the cell pattern you could multiply the
> cell function value with coarsely sampled evaluations of the original
> height_field image. That would give "city blocks" of constant height
> appropriate for local average terrain. It will introduce steps on
> roofs that fall on a cell boundary but maybe it looks like an
> intended structure ;)
>
Well, this is not as simple as it seems, or I am doing something wrong
(probably).
I wrote a simple test code which I think explains things. Just insert it
in a basic scene:
//Start code
#declare HF_pig =
pigment {
image_map {
png "plasma3.png"
}
rotate -90*x
}
#declare F_cells =
function {
pigment {
cells
color_map {
[0.1 rgb 0.4]
[0.9 rgb 0.6]
}
//warp {turbulence <0.1, 0, 0.1>}
scale 0.03
}
}
#declare F_HF_00 =
function {
pigment {
image_map {
png "plasma3.png" gamma 1.0
map_type 0
interpolate 2
}
}
}
#declare F_flatroof =
function {
F_cells(x,y,z).hf
* F_HF_00 (x,y,z).hf
}
#declare hf_cut =
intersection {
height_field {
function 500, 500 {F_flatroof(x,y,z)}
smooth
translate <-0.5, 0, -0.5>
scale <10, 1, 10>
}
box {
<-0.5, -0.5, -0.5>, <0.5, 0.5, 0.5>
scale <10, 1, 10> * <0.99, 20, 0.99>
}
translate 1.0*y
}
intersection {
object {hf_cut}
box {
<-0.5, -0.5, -0.5>, <0.5, 0.5, 0.5>
scale <3, 10, 5>
rotate 45*y
}
pigment {rgbt <1,1,0,0.1>}
}
//----------------------------------------------------------
intersection {
height_field {
function 1000, 1000 {F_HF_00(x,y,z).hf}
smooth
pigment {HF_pig}
translate <-0.5, 0.0, -0.5>
scale <10, 1, 10>
}
box {
<-0.5, -0.5, -0.5>, <0.5, 0.5, 0.5>
scale <10, 1, 10> * <0.99, 10, 0.99>
}
}
//End code
Thomas
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