Some of the textures I created for the Indiana Jones and the Great Circle DLC, The order of Giants.
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We had very limited time to produce content so most of the textures took a day or less. Often a day max for main texture and then few hours to produce some variations for blends.
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Shopfronts kit took a bit longer, as it took a day or so to design and bake it, around a day to texture and then one more day to produce modules, fix issues and do some slight iterations.
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Terracotta tiles were sculpted first so took longer than a day, around 2 or so I guess, for each set.
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We tried not to overcomplicate our work so we often took the shortest path, hopefully without sacrificing quality. We reused some content from the base game, like certain textures and dressing items, but at the same time produced quite a lot of new content, like most of the architecture (and textures for it) is entirely new.