Category:Map projections with Tissot's indicatrix/Templates

Template images of equirectangular maps with Tissot's indicatrices of several resolution

Povray source code for these images:

#declare DEG=2; #declare NUM = 720/DEG; #declare R= (2*pi / NUM)*0.5; #declare Kugel = sphere { <0,0,1>, R pigment { color rgbt<0.9,0,0,0.5> } finish { ambient 1 } } #declare X=0; #declare LAMBDA=-180; #while( LAMBDA<+180 ) #declare PHI = -90 + DEG; #while( PHI < +90 ) #declare SNIP = int( (R*NUM)/(cos(PHI*pi/180)*pi)+0.5); #if( (SNIP > 1) & ( mod(X,SNIP)>0) ) // omit sphere #else object { Kugel rotate x*PHI rotate y*LAMBDA } #end #declare PHI=PHI+DEG; #end #declare X=X+1; #declare LAMBDA = LAMBDA + DEG; #end object { Kugel rotate x*90 } object { Kugel rotate x*-90 } camera { spherical location <0,0,0> look_at <0,0,1> // sky <1,1,0> // for oblique maps }