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-rw-r--r--mcmap/chunk.go20
1 files changed, 19 insertions, 1 deletions
diff --git a/mcmap/chunk.go b/mcmap/chunk.go
index 9cf2dc7..d11d24b 100644
--- a/mcmap/chunk.go
+++ b/mcmap/chunk.go
@@ -110,4 +110,22 @@ func (c *Chunk) SetBiome(x, z int, bio Biome) { c.biomes[x*ChunkSizeXZ+z] = bio
// If the chunk was modified, call MarkModified BEFORE.
func (c *Chunk) MarkUnused() error { return c.reg.unloadChunk(int(c.x), int(c.z)) }
-// TODO: func (c *Chunk) RecalcHeightMap()
+// RecalcHeightMap recalculates the internal height map.
+//
+// You should use this function before marking the chunk as unused, if you modified the chunk
+// (unless you know, your changes wouldn't affect the height map).
+func (c *Chunk) RecalcHeightMap() {
+ i := 0
+ for z := 0; z < ChunkSizeXZ; z++ {
+ for x := 0; x < ChunkSizeXZ; x++ {
+ for y := ChunkSizeY; y >= 0; y-- {
+ blkid := c.blocks[calcBlockOffset(x, y, z)].ID
+ if (blkid != BlkAir) && (blkid != BlkGlass) && (blkid != BlkGlassPane) {
+ c.heightMap[i] = int32(y)
+ break
+ }
+ }
+ i++
+ }
+ }
+}