This option determines the order in which triangles will be listed in the mesh. Otherwise they might not be rendered in game builds correctly. Normally this is detected at build time, but when meshes are scaled or instantiated at runtime you need to set this manually.
The reason is that non-uniform scaling requires the mesh data to be kept in memory. However, if you are scaling or instantiating meshes at runtime with a non-uniform scale, you may have to enable 'Read/Write Enabled' in their import settings. When this option is turned off, it saves memory since Unity can unload a copy of mesh data in the game. This is useful for optimizing game size.Įnables the mesh to be written at runtime so you can modify the data it makes a copy in memory. It's best to turn it up as high as possible without the mesh looking too different from the uncompressed version. Increasing this value will reduce the file size of the mesh, but might introduce irregularities. defaults for different 3D packages are as follows. If you prefer to model at a different scale then you can compensate for it here.
Unity's physics system expects 1 meter in the game world to be 1 unit in the imported file.
