Garry's Mod Hitbox ESP

local IGNOREZ = true;

local color = Color( 255, 255, 0, 50 );

local that_other_color = Color( color.r, color.g, color.b, 255 );

local function DrawHitbox()
    cam.Start3D( EyePos(), EyeAngles() );
        for i, ent in pairs( ents.GetAll() ) do
            if( !ent ) then continue; end
            if( !IsValid( ent ) ) then continue; end
            if( ent == LocalPlayer() ) then continue; end
            if( !ent:IsPlayer() && !ent:IsNPC() ) then continue; end
            if( ( ent:IsPlayer() && !ent:Alive() ) || ( ent:IsNPC() && ent:GetMoveType() == 0 ) ) then continue; end
            for hitbox = 0, ent:GetHitBoxCount(0) do
                local bone = ent:GetHitBoxBone( hitbox, 0 );
                local bpos, bang = ent:GetBonePosition( bone );
                local min, max = ent:GetHitBoxBounds( hitbox, 0 );
                if( min == nil || max == nil ) then
                    continue;
                end
                if( !IGNOREZ ) then
                    render.SetColorMaterial();
                else
                    render.SetColorMaterialIgnoreZ();
                end
                render.SetBlend( color.a / 255 );
                render.DrawBox( bpos, bang, min, max, color, !IGNOREZ );
                render.DrawWireframeBox( bpos, bang, min, max, that_other_color, !IGNOREZ );
            end
        end
    cam.End3D();
end

hook.Add( "RenderScreenspaceEffects", "Render", DrawHitbox );