Fix flat generator when using blocky mesher with LOD

generators/simple/voxel_generator_flat.cpp

@@ -104,21 +104,12 @@ VoxelGenerator::Result VoxelGeneratorFlat::generate_block(VoxelGenerator::VoxelQ
  } else {
  // Blocky
 
- int gz = origin.z;
- for (int z = 0; z < bs.z; ++z, gz += stride) {
- int gx = origin.x;
- for (int x = 0; x < bs.x; ++x, gx += stride) {
- const float h = params.height - origin.y;
- int ih = int(h);
- if (ih > 0) {
- if (ih > bs.y) {
- ih = bs.y;
- }
- out_buffer.fill_area(params.voxel_type, Vector3i(x, 0, z), Vector3i(x + 1, ih, z + 1), channel);
- }
-
- } // for x
- } // for z
+ const float rh_world = params.height - origin.y;
+ const int irh_world = static_cast<int>(rh_world);
+ if (irh_world > 0) {
+ const int irh_voxels = math::min(math::arithmetic_rshift(irh_world, input.lod), bs.y);
+ out_buffer.fill_area(params.voxel_type, Vector3i(0, 0, 0), Vector3i(bs.x, irh_voxels, bs.z), channel);
+ }
  } // use_sdf
 
  return result;