Hi,
Ok, it's correct, because my formula go well only with elevation=0
I believed to found a formula that permit me to put four patches at four
angles of the field of view, and I expected (wrong) to view these
four images always at the angles of the screen,
but this is true only with elevation=0.
Ok,ok, it's only an accademic discussion...just to learn....
---------------------------------------------------------------------
--
-- calculate and show fov limits
--
---------------------------------------------------------------------ù
side = pipmak.newimage(512,512):color(0,0,1):fill(0,0,512,256)
side:color(1,1,1):fill(0,256,512,256)
top = pipmak.newimage(512,512):color(0,0,1):fill(0,0,512,512)
bottom = pipmak.newimage(512,512):color(1,1,1):fill(0,0,512,512)
cubic {side,side,side,side,top,bottom}
---------------------------------------------------------------------
function setpos(p,dis,az,el)
local nz = -math.cos(math.rad(az))*math.cos(math.rad(el))
local nx = math.sin(math.rad(az))*math.cos(math.rad(el))
local ny = math.sin(math.rad(el))
local dl = math.deg(math.asin(nx))
local bz = math.deg(math.atan2(ny, -nz))
p:move{nx=nx*dis, ny=ny*dis, nz=nz*dis, anglex=bz, angley=-dl}
end
---------------------------------------------------------------------
function setfovlimits(az,el,di,hdl)
local width,height = pipmak.screensize()
local vfov_deg = pipmak.getverticalfov()
local vfov_rad = math.rad(vfov_deg)
local distance = (height/2)/math.tan(vfov_rad/2)
local hfov_rad = 2*math.atan((width/2)/distance)
local hfov_deg = math.deg(hfov_rad)
local az_min = az-hfov_deg/2
local az_max = az+hfov_deg/2
local el_min = el-vfov_deg/2
local el_max = el+vfov_deg/2
hdl:move{az=az_min,el=el_max,w=hfov_deg,h=vfov_deg}
setpos(p1,di ,az, el )
setpos(p2,di ,az_min, el )
setpos(p3,di ,az_max, el )
setpos(p4,di ,az, el_min)
setpos(p5,di ,az, el_max)
pipmak.setviewdirection(az,el)
end
---------------------------------------------------------------------
az = 90
el = 0
di = 4
hdl = handle{az=0,el=0,w=0,h=0}
cross=pipmak.newimage(64,64):fill(30,0,4,64):fill(0,30,64,4)
p1=patch{nx=0,ny=0,nz=0,anchorh=32,anchorv=32,w=64,h=64,image=cross }
p2=patch{nx=0,ny=0,nz=0,anchorh=32,anchorv=32,w=64,h=64,image=cross }
p3=patch{nx=0,ny=0,nz=0,anchorh=32,anchorv=32,w=64,h=64,image=cross }
p4=patch{nx=0,ny=0,nz=0,anchorh=32,anchorv=32,w=64,h=64,image=cross }
p5=patch{nx=0,ny=0,nz=0,anchorh=32,anchorv=32,w=64,h=64,image=cross }
setfovlimits(az,el,di,hdl)
pipmak.setshowcontrols(true)
onkeydown (
function(key)
press="no"
if key == pipmak.key_arrow_up then press="yes" el=el+10 end
if key == pipmak.key_arrow_down then press="yes" el=el-10 end
if press=="yes" then
setfovlimits(az,el,di,hdl)
return true
else
pipmak_internal.project.onkeydown(key)
return true
end
end
)
---------------------------------------------------------------------
P.S.: I don't remember anymore why I fell in this.....
Probably the heat has a bad effect on me....
Bye
-Andrea
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