<function name="SetCollisionGroup" parent="Entity" type="classfunc"> <description>Sets the entity's collision group.</description> <realm>Shared</realm> <args> <arg name="group" type="number">Collision group of the entity, see <page>COLLISION_GROUP</page></arg>⤶ <arg name="group" type="number">Collision group of the entity, see <page>Enums/COLLISION_GROUP</page></arg>⤶ </args> </function> <example> <description> Showcase function that produces reliable player-player nocollision for targets. First argument is any player entity, second is an optional number for min time. After min time elapsed, no-collision will turn off once we are not penetrating any players. Contains no fail-saves or checks. </description> <code> function ActivateNoCollision(target, min) local oldCollision = target:GetCollisionGroup() or COLLISION_GROUP_PLAYER target:SetCollisionGroup(COLLISION_GROUP_PASSABLE_DOOR) -- Players can walk through target if (min and (tonumber(min) &gt; 0)) then timer.Simple(min, function() --after 'min' seconds timer.Create(target:SteamID64().."_checkBounds_cycle", 0.5, 0, function() -- check every half second local penetrating = ( self:GetPhysicsObject() and self:GetPhysicsObject():IsPenetrating() ) or false --if we are penetrating an object local tooNearPlayer = false --or inside a player's hitbox for _, ply in pairs(player.GetAll()) do if target:GetPos():DistToSqr(ply:GetPos()) &lt;= (80*80) then tooNearPlayer = true end end if not (penetrating and tooNearPlayer) then --if both false then target:SetCollisionGroup(oldCollision) -- Stop no-colliding by returning the original collision group (or default player collision) timer.Destroy(target:SteamID64().."_checkBounds_cycle") end end) end) end end ActivateNoCollision(Entity( 1 ), 10) </code> <output>You can walk through the player for 10 seconds</output> </example>