I'm having a problem making collisions using my own script. Mario falls through the ground when I turn on treat uninitialized variable as 0 in the global game settings so I turned it off. If I turn it off, I get an error :blank: : [quote] ___________________________________________ ERROR in action number 4 of Step Event for object obj_mario: In script col_rect: Error in code at line 2: if argument0 > block.bbox_left //x1 ^ at position 23: Unknown variable bbox_left [/quote] I used this code for my script: [code] block = collision_rectangle(bbox_left,bbox_top,bbox_right,bbox_bottom,obj_solidground,1,1) if argument0 > block.bbox_left //x1 or argument1 > block.bbox_bottom //y1 or argument2 < block.bbox_left //x2 or argument3 < block.bbox_top //y2 return false; else return true; [/code] I use it in the step event: [code] if col_rect(bbox_left,bbox_bottom,bbox_right,bbox_bottom+yspeed+1,obj_solidground)//collision_rectangle(bbox_left,bbox_bottom,bbox_right,bbox_bottom+yspeed+1,obj_solidground,1,1) { topblock = collision_rectangle(bbox_left,bbox_bottom,bbox_right,bbox_bottom+yspeed+1,obj_solidground,1,1) if yspeed > 0 and y+sprite_height < topblock.bbox_top+1 { y = topblock.bbox_top-31 yspeed = 0 grav = 0 jumpnow = 0 } } else { if yspeed < -2 grav = 0.1 else grav = 0.3 } [/code] Is there a way to fix it?

Let's correct your scripts by steps: 1-you create a script that check if it is a collision or not with a object_solid_ground.But it is useless.Why?Because if colision__rectangle(...,obj_solidground)=-1,It doesn't have collision with this,but if colision__rectangle(...,obj_solidground)!=-1 (that the obj.id), it has a collision.So true and false result coud be made in a simpler way. 2-If you want to use this script,you need to fix the inequalities.First x1(argument0) must be >block.bbox_right.And you need to change "or" for "and",because if,for example,x2<block.bbox_left and block.bbox_top<y2<block.bbox_bottom,by logic,must have a collision. 3-This error warning is due the fact that block will be -1,because Mario doesn't collide with anything.if block isn't a obj.id,so doesn't exist block.bbox_left and the others. 4-Change "y+sprite_height < topblock.bbox_top+1" for y+sprite_height-vspeed < topblock.bbox_top+1,because it possible,with a higher vspeed, that "y+sprite_height >topblock.bbox_top+1", and Mario falls. I didn't test theses fixes,so I don't the possible results.