From bb2a1fac4a9701b121b954e68cacb203108f4d89 Mon Sep 17 00:00:00 2001
From: Roman Deev <roman.deev06@gmail.com>
Date: Mon, 31 Aug 2026 04:50:10 +0300
Subject: [PATCH] #31 support building:min_level

---
 src/buildingpart.js | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/src/buildingpart.js b/src/buildingpart.js
index e61a4f1..3834320 100644
--- a/src/buildingpart.js
+++ b/src/buildingpart.js
@@ -107,7 +107,7 @@ class BuildingPart {
     specifiedOptions.building.levelsUnderground = this.getAttribute('building:levels:underground');
     specifiedOptions.building.material = this.getAttribute('building:material');
     specifiedOptions.building.minHeight = BuildingPart.normalizeLength(this.getAttribute('min_height'));
-    specifiedOptions.building.minLevel = this.getAttribute('building:min_level');
+    specifiedOptions.building.minLevel = BuildingPart.normalizeNumber(this.getAttribute('building:min_level'));
     specifiedOptions.building.walls = this.getAttribute('walls');
     specifiedOptions.roof.angle = this.getAttribute('roof:angle');
     specifiedOptions.roof.colour = this.getAttribute('roof:colour');
@@ -128,7 +128,9 @@ class BuildingPart {
     calculatedOptions.building.levelsUnderground = this.options.specified.building.levelsUnderground ?? this.options.inherited.building.levelsUnderground;
     calculatedOptions.building.material = this.options.specified.building.material ?? this.options.inherited.building.material;
     calculatedOptions.building.minLevel = this.options.specified.building.minLevel ?? this.options.inherited.building.minLevel;
-    calculatedOptions.building.minHeight = this.options.specified.building.minHeight ?? this.options.inherited.building.minHeight ?? 0;
+    calculatedOptions.building.minHeight = this.options.specified.building.minHeight
+                                        ?? this.options.inherited.building.minHeight
+                                        ?? (this.options.specified.building.minLevel ? this.options.specified.building.minLevel * 3 : null);
     calculatedOptions.building.walls = this.options.specified.building.walls ?? this.options.inherited.building.walls;
     calculatedOptions.roof.angle = this.options.specified.roof.angle ?? this.options.inherited.roof.angle;
     calculatedOptions.roof.colour = this.options.specified.roof.colour ?? this.options.inherited.roof.colour;
@@ -179,7 +181,7 @@ class BuildingPart {
     if (this.options.roof.shape === 'skillion' && this.options.roof.direction === undefined) {
       window.printError('Part ' + this.id + ' requires a direction. (https://wiki.openstreetmap.org/wiki/Key:roof:direction)');
     }
-    this.extrusionHeight = this.options.building.height - this.options.building.minHeight - this.options.roof.height;
+    this.extrusionHeight = this.options.building.height - (this.options.building.minHeight ?? 0) - this.options.roof.height;
   }
 
   /**
@@ -206,7 +208,7 @@ class BuildingPart {
   }
 
   createBuilding() {
-    let extrusionHeight = this.options.building.height - this.options.building.minHeight - this.options.roof.height;
+    let extrusionHeight = this.options.building.height - (this.options.building.minHeight ?? 0) - this.options.roof.height;
 
     let extrudeSettings = {
       bevelEnabled: false,
@@ -220,7 +222,7 @@ class BuildingPart {
 
     // Change the position to compensate for the min_height
     mesh.rotation.x = -Math.PI / 2;
-    mesh.position.set( 0, this.options.building.minHeight, 0);
+    mesh.position.set( 0, this.options.building.minHeight ?? 0, 0);
     mesh.name = 'b' + this.id;
     return mesh;
   }