Important: this engine makes heavy use of threads. Generators will run in one of them, so make sure you don't access the scene tree or other unsafe APIs from within a generator.
[code]out_buffer[/code]: Buffer in which to populate voxel data. It will never be [code]null[/code] and will have the requested size. It is only valid for this function, do not store it anywhere after the end.
[code]origin_in_voxels[/code]: Coordinates of the lower corner of the box to generate, relative to LOD0. The size of the box is known from [code]out_buffer[/code].
[code]lod[/code]: Level of detail index to use for this block. It can be ignored if you don't use LOD. This may be used as a power of two, telling how big is one voxel. For example, if you use a loop to fill the buffer using noise, you should sample that noise at steps of 2^lod, starting from [code]origin_in_voxels[/code] (in code you can use [code]1 << lod[/code] for fast computation, instead of [code]pow(2, lod)[/code]). You may want to separate variables that iterate the coordinates in [code]out_buffer[/code] and variables used to generate voxel values in space.
Use this to indicate which channels your generator will use. It returns a bitmask, so for example you may provide information like this: [code](1 << channel1) | (1 << channel2)[/code]
