Spreadsheet Functions (cont)
texmap_read_r(u,v,lod, clk) - returns ‘R’ color value from texmap
texmap_read_a(u,v,lod,clk) - returns ‘A’ color value from texmap
These are implemented as dummy functions which return the same value for every u,v. The value returned depends upon ‘lod’; the returned value is determined by the variable names ‘lod0_r’, ‘lod0_a’, ‘lod1_r’, ‘lod1_a’, … ‘lod3_r’, ‘lod3_a’ defined on the ‘parms’ worksheet.