Le 2020-08-13 à 11:43, Jörg "Yadgar" Bleimann a écrit :
> Hi(gh)!
> 
> Meanwhile, I fixed mesh2writer.pov and placed the global flattening of 
> the mesh2 object into povearth.pov... but now another problem showed up: 
> the terrain texture is strangely distorted, as if in each line of 
> vertices, one texture sample is omitted (see attachment).
> 
> The respective code in mesh2writer.pov:
> 
> // begin code
> 
> #if (!(tilename="n80e014" | tilename="n80e016" | tilename="n80e017")) // 
> for elevation data tiles north of 80°N, no Blue Marble texture tiles are 
> available!
>    #declare i=0;
>    #write (ES, "  texture_list")
>    #write (ES, "  {\n")
>    #write (ES, concat("    ",str(NumTextures, 1, 0),"\n"))
>    #for (a, 0, ydim-1)
> 
>      #for (b, 0, xdim-1)
>        #declare C_Texture = eval_pigment(P_Texture, 
> <(0.5+b)*(1/(xdim-1)), (0.5+a)*(1/(ydim-1)), 0>);
>        // #warning concat("Iteration ", str(a, 1, 0), "-", str(b, 1, 0))
>        #write (ES, "    texture\n")
>        #write (ES, "    {\n")
>        #write (ES, "      pigment\n")
>        #write (ES, "      {\n")
>        #write (ES, concat("       color rgb <",vstr(3, C_Texture, ",", 
> 1, 7),">\n"))
>        #write (ES, "      }\n")
>        #write (ES, "    }\n")
>        // #declare c=c+1;
>      #end
>    #end
>    #write (ES, "  }\n")
> #end
> 
> // end code
> 
> I tried to replace xdim-1 and ydim-1 with xdim and ydim respectively, 
> but then got the error message "missing }, texture found instead" - 
> obviously, NumTextures is exceeded. But when I in fact use the full xdim 
> and ydim values, shouldn't there be a black last column and row?
> 
> See you in Khyberspace!
> 
> Yadgar

Looks like one image was taken late summer during a drought and the 
other in late rainy spring.

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