Mudflow of a neighbouring mapchunk extends into a mapchunk's edge, and could
remove 'dirt with grass' from under a decoration, creating unsupported
decorations.
Remove any decoration above if a 'dirt with grass' node is removed by mudflow.
v3s16(-1, 0, 0), // left
};
v3s16(-1, 0, 0), // left
};
- // Check that upper is air or doesn't exist.
- // Cancel dropping if upper keeps it in place
+ // Check that upper is walkable. Cancel
+ // dropping if upper keeps it in place.
u32 i3 = i;
vm->m_area.add_y(em, i3, 1);
u32 i3 = i;
vm->m_area.add_y(em, i3, 1);
- if (vm->m_area.contains(i3) == true &&
- ndef->get(vm->m_data[i3]).walkable)
- continue;
+ MapNode *n3 = NULL;
+
+ if (vm->m_area.contains(i3)) {
+ n3 = &vm->m_data[i3];
+ if (ndef->get(*n3).walkable)
+ continue;
+ }
// Drop mud on side
for (u32 di = 0; di < 4; di++) {
// Drop mud on side
for (u32 di = 0; di < 4; di++) {
if (!dropped_to_unknown) {
*n2 = *n;
// Set old place to be air (or water)
if (!dropped_to_unknown) {
*n2 = *n;
// Set old place to be air (or water)
*n = MapNode(c_water_source);
*n = MapNode(c_water_source);
*n = MapNode(CONTENT_AIR);
*n = MapNode(CONTENT_AIR);
+ // Upper (n3) is not walkable or is NULL. If it is
+ // not NULL and not air and not water it is a
+ // decoration that needs removing, to avoid
+ // unsupported decorations.
+ if (n3 && n3->getContent() != CONTENT_AIR &&
+ n3->getContent() != c_water_source)
+ *n3 = MapNode(CONTENT_AIR);
+ }