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I wrote a LUA script to setup frame by frame animation, but if I try to change the material for a CSG brush during the game loop, it will not appear on the object in the game. I applied the same script I wrote to a sprite object and a cube model I exported from Blender and the material for each changed just fine during the loop. Am I doing something wrong for CSG brushes or is this a bug? Thanks! Here is the script I wrote for testing purposes: Script.speed = 10.0 -- float "Animation Speed" Script.material1 = "" --path "Material (Frame 1)" "Material File (*mat):mat|Material" Script.material2 = "" --path "Material (Frame 2)" "Material File (*mat):mat|Material" Script.material3 = "" --path "Material (Frame 3)" "Material File (*mat):mat|Material" Script.material4 = "" --path "Material (Frame 4)" "Material File (*mat):mat|Material" Script.material5 = "" --path "Material (Frame 5)" "Material File (*mat):mat|Material" Script.frames = 0 Script.currTime = 0.0 Script.currFrame = 0; Script.mat1 = nil; Script.mat2 = nil; Script.mat3 = nil; Script.mat4 = nil; Script.mat5 = nil; function Script:Start() if(self.material1 ~= "") then self.frames = self.frames + 1; self.mat1 = Material:Load(self.material1); end; if(self.material2 ~= "") then self.frames = self.frames + 1; self.mat2 = Material:Load(self.material2); end; if(self.material3 ~= "") then self.frames = self.frames + 1; self.mat3 = Material:Load(self.material3); end; if(self.material4 ~= "") then self.frames = self.frames + 1; self.mat4 = Material:Load(self.material4; end; if(self.material5 ~= "") then self.frames = self.frames + 1; self.mat5 = Material:Load(self.material5); end; end function Script:UpdateWorld() if(self.currTime >= self.speed) then self.entity:SetMaterial(self.mat2) self.currFrame = self.currFrame + 1; if( self.currFrame > self.frames ) then self.currFrame = 1 end if( self.currFrame == 1 ) then self.entity:SetMaterial(self.mat1) end if( self.currFrame == 2 ) then self.entity:SetMaterial(self.mat2) end if( self.currFrame == 3 ) then self.entity:SetMaterial(self.mat3) end if( self.currFrame == 4 ) then self.entity:SetMaterial(self.mat4) end if( self.currFrame == 5 ) then self.entity:SetMaterial(self.mat5) end self.currTime = 0; else self.currTime = self.currTime + Time:GetSpeed(); end end