+ core::aabbox3d<f32> nodebox = getNodeBox(v3s16(x,y,z), BS);
+
+ /*
+ See if the player is touching ground.
+
+ Player touches ground if player's minimum Y is near node's
+ maximum Y and player's X-Z-area overlaps with the node's
+ X-Z-area.
+
+ Use 0.15*BS so that it is easier to get on a node.
+ */
+ if(
+ //fabs(nodebox.MaxEdge.Y-playerbox.MinEdge.Y) < d
+ fabs(nodebox.MaxEdge.Y-playerbox.MinEdge.Y) < 0.15*BS
+ && nodebox.MaxEdge.X-d > playerbox.MinEdge.X
+ && nodebox.MinEdge.X+d < playerbox.MaxEdge.X
+ && nodebox.MaxEdge.Z-d > playerbox.MinEdge.Z
+ && nodebox.MinEdge.Z+d < playerbox.MaxEdge.Z
+ ){
+ touching_ground = true;
+ if(is_unloaded)
+ standing_on_unloaded = true;
+ }
+
+ // If player doesn't intersect with node, ignore node.
+ if(playerbox.intersectsWithBox(nodebox) == false)
+ continue;
+
+ /*
+ Go through every axis
+ */
+ v3f dirs[3] = {
+ v3f(0,0,1), // back-front
+ v3f(0,1,0), // top-bottom
+ v3f(1,0,0), // right-left
+ };
+ for(u16 i=0; i<3; i++)
+ {
+ /*
+ Calculate values along the axis
+ */
+ f32 nodemax = nodebox.MaxEdge.dotProduct(dirs[i]);
+ f32 nodemin = nodebox.MinEdge.dotProduct(dirs[i]);
+ f32 playermax = playerbox.MaxEdge.dotProduct(dirs[i]);
+ f32 playermin = playerbox.MinEdge.dotProduct(dirs[i]);
+ f32 playermax_old = playerbox_old.MaxEdge.dotProduct(dirs[i]);
+ f32 playermin_old = playerbox_old.MinEdge.dotProduct(dirs[i]);
+
+ /*
+ Check collision for the axis.
+ Collision happens when player is going through a surface.
+ */
+ /*f32 neg_d = d;
+ f32 pos_d = d;
+ // Make it easier to get on top of a node
+ if(i == 1)
+ neg_d = 0.15*BS;
+ bool negative_axis_collides =
+ (nodemax > playermin && nodemax <= playermin_old + neg_d
+ && m_speed.dotProduct(dirs[i]) < 0);
+ bool positive_axis_collides =
+ (nodemin < playermax && nodemin >= playermax_old - pos_d
+ && m_speed.dotProduct(dirs[i]) > 0);*/
+ bool negative_axis_collides =
+ (nodemax > playermin && nodemax <= playermin_old + d
+ && m_speed.dotProduct(dirs[i]) < 0);
+ bool positive_axis_collides =
+ (nodemin < playermax && nodemin >= playermax_old - d
+ && m_speed.dotProduct(dirs[i]) > 0);
+ bool main_axis_collides =
+ negative_axis_collides || positive_axis_collides;
+
+ /*
+ Check overlap of player and node in other axes
+ */
+ bool other_axes_overlap = true;
+ for(u16 j=0; j<3; j++)
+ {
+ if(j == i)
+ continue;
+ f32 nodemax = nodebox.MaxEdge.dotProduct(dirs[j]);
+ f32 nodemin = nodebox.MinEdge.dotProduct(dirs[j]);
+ f32 playermax = playerbox.MaxEdge.dotProduct(dirs[j]);
+ f32 playermin = playerbox.MinEdge.dotProduct(dirs[j]);
+ if(!(nodemax - d > playermin && nodemin + d < playermax))