set
fun setBatchTexture(k: Int, texCoordMatrix: Matrix3, terrainSector: Sector, textureSector: Sector, opacity: Float)
Packs batch slot k from the texture's coordinate transform and the terrain/texture sectors: the tile-local -> image scale+translation and the texture's coverage rectangle in tile-local coordinates. texCoordMatrix must be axis-aligned affine (scale + translation, e.g. a vertical flip); rotation and shear terms are ignored.