order to do that, we simulated the cg world where the lighting was exactly the same, and then we use the number of techniques to copy and mimic what we were seeing in the computer. so rather than butter. we still used the photography and built on top of it, rather than replacing it whole hog, but we used the simulation to tell us what that should look like. the director was — what that should look like. the director was very _ what that should look like. ii2 director was very keen to what that should look like. i“i2 director was very keen to give as much of the stuff that he shot as he could. that included the people, that included the buildings, the trees, even, but the trees didn't have snow on them. so each tree had to be — particularfor them. so each tree had to be — particular for the close—up trees, they had to be modelled in cgi to look exactly like the trees that were there. we put snow on them digitally and then lifted the digital snow off and put them on top of the real trees that were in the plate.