Baking textures in Adobe Substance 3D Painter
Once the 3D model is exported from any 3D software, it can be easily imported inside Adobe Substance 3D Painter; however, you will not be able to paint over it or apply any material to it until or unless you bake its textures.
Baking textures
The process of storing information from a 3D geometry to a texture file is known as baking (bitmap). This procedure usually entails two meshes, a high-poly mesh and a low-poly mesh. Because a high-poly mesh includes a large number of polygons (sometimes millions), it can display high-resolution 3D detail. Because a low-poly mesh has a smaller number of polygons (typically only a few thousand), it is less expensive to store and render. Baking textures gives you the best of both worlds: the high degree of detail provided by a high-poly mesh and the low performance costs provided by a low-poly mesh. The information from the high-poly mesh is transferred to the low-poly mesh and preserved as a texture...