To save time when importing into Marmoset, it is very important to use good nomenclature. If there is an empty space that is not possible to fill with any other element of the scene I usually choose to increase a little bit the size of those UV islands that will be more visible in the scene, just as I usually decrease the size of UVislands that are practically not going to be seen if I need more space on the UV map. This way, I get automatically packed UVs that serves as a base to manually relocate the islands I consider so as not to leave empty spaces in the UVs. Later I use the “Pack Normalize” option, varying the Padding option until I get the correct Padding. For this my method in 3ds Max’s UV editor is to select all the UV islands and to select the option “Rescale Elements”, this will convert all our UV islands to the correct size with respect to the others, that is, the pixel density in the texture will be the same for all the islands. With all the islands unwrapped and as straight as possible it is time to pack them. Putting all possible edges completely straight will prevent from obtaining the jagged effect that is generated in the textures when there are inclined edges, and which is usually especially annoying in the Normal Map. Then I select the rest of the edges that are almost horizontal and press”Align Horizontally in Place”, and “Align Vertically in Place” for the rest of the edges that are practically vertical to align them perfectly. For this, I started by selecting an edge that I want to position completely horizontally and pressing the “Align To Edge” option. When all my islands were correctly unwrapped, it was time to put all the islands as straight as possible. If any islands are not unwrapped correctly with Quick Peel I usually use the Pelt Map option to get somewhat more precise control over the unwrap. If any island has too much tension that can generate deformations in our UVs we will introduce additional cuts. If we have set the Smoothing Groups correctly, this will give us a very good basis to start with our unwrapping since the islands will be separated correctly. To correctly unwrap the UV islands, initially, I used the option “Flatten by smoothing Groups” selecting all the islands, followed by the option “QuickPeel”.
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