diff options
Diffstat (limited to 'src/voxelalgorithms.cpp')
| -rw-r--r-- | src/voxelalgorithms.cpp | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/src/voxelalgorithms.cpp b/src/voxelalgorithms.cpp index 93cc33acc..c20917164 100644 --- a/src/voxelalgorithms.cpp +++ b/src/voxelalgorithms.cpp @@ -747,5 +747,73 @@ void update_lighting_nodes(Map *map, INodeDefManager *ndef, } } +VoxelLineIterator::VoxelLineIterator( + const v3f &start_position, + const v3f &line_vector) : + m_start_position(start_position), + m_line_vector(line_vector), + m_next_intersection_multi(10000.0f, 10000.0f, 10000.0f), + m_intersection_multi_inc(10000.0f, 10000.0f, 10000.0f), + m_step_directions(1.0f, 1.0f, 1.0f) +{ + m_current_node_pos = floatToInt(m_start_position, 1); + + if (m_line_vector.X > 0) { + m_next_intersection_multi.X = (floorf(m_start_position.X - 0.5) + 1.5 + - m_start_position.X) / m_line_vector.X; + m_intersection_multi_inc.X = 1 / m_line_vector.X; + } else if (m_line_vector.X < 0) { + m_next_intersection_multi.X = (floorf(m_start_position.X - 0.5) + - m_start_position.X + 0.5) / m_line_vector.X; + m_intersection_multi_inc.X = -1 / m_line_vector.X; + m_step_directions.X = -1; + } + + if (m_line_vector.Y > 0) { + m_next_intersection_multi.Y = (floorf(m_start_position.Y - 0.5) + 1.5 + - m_start_position.Y) / m_line_vector.Y; + m_intersection_multi_inc.Y = 1 / m_line_vector.Y; + } else if (m_line_vector.Y < 0) { + m_next_intersection_multi.Y = (floorf(m_start_position.Y - 0.5) + - m_start_position.Y + 0.5) / m_line_vector.Y; + m_intersection_multi_inc.Y = -1 / m_line_vector.Y; + m_step_directions.Y = -1; + } + + if (m_line_vector.Z > 0) { + m_next_intersection_multi.Z = (floorf(m_start_position.Z - 0.5) + 1.5 + - m_start_position.Z) / m_line_vector.Z; + m_intersection_multi_inc.Z = 1 / m_line_vector.Z; + } else if (m_line_vector.Z < 0) { + m_next_intersection_multi.Z = (floorf(m_start_position.Z - 0.5) + - m_start_position.Z + 0.5) / m_line_vector.Z; + m_intersection_multi_inc.Z = -1 / m_line_vector.Z; + m_step_directions.Z = -1; + } + + m_has_next = (m_next_intersection_multi.X <= 1) + || (m_next_intersection_multi.Y <= 1) + || (m_next_intersection_multi.Z <= 1); +} + +void VoxelLineIterator::next() +{ + if ((m_next_intersection_multi.X < m_next_intersection_multi.Y) + && (m_next_intersection_multi.X < m_next_intersection_multi.Z)) { + m_next_intersection_multi.X += m_intersection_multi_inc.X; + m_current_node_pos.X += m_step_directions.X; + } else if ((m_next_intersection_multi.Y < m_next_intersection_multi.Z)) { + m_next_intersection_multi.Y += m_intersection_multi_inc.Y; + m_current_node_pos.Y += m_step_directions.Y; + } else { + m_next_intersection_multi.Z += m_intersection_multi_inc.Z; + m_current_node_pos.Z += m_step_directions.Z; + } + + m_has_next = (m_next_intersection_multi.X <= 1) + || (m_next_intersection_multi.Y <= 1) + || (m_next_intersection_multi.Z <= 1); +} + } // namespace voxalgo |