message: MINOR: Perf improvement for fill techniques
  Don't compute the roof vertices for non extruded polygons
diff: @@ -1557,7 +1557,6 @@ export class OmvDecodedTileEmitter implements IOmvEmitter {
  }
  tempFootDisp.copy(tempVertNormal).multiplyScalar(floorHeight * scaleFactor);
  - tempRoofDisp.copy(tempVertNormal).multiplyScalar(height * scaleFactor);
  positions.push(
  tmpV3.x + tempFootDisp.x,
  tmpV3.y + tempFootDisp.y,
  @@ -1570,6 +1569,7 @@ export class OmvDecodedTileEmitter implements IOmvEmitter {
  normals.push(...tempVertNormal.toArray());
  }
  if (isExtruded) {
  + tempRoofDisp.copy(tempVertNormal).multiplyScalar(height * scaleFactor);
  positions.push(
  tmpV3.x + tempRoofDisp.x,
  tmpV3.y + tempRoofDisp.y,
  