The scale texture part is in the terrain_materials script around line 279.

Out.Tex5 = inTexCoord0.xy*40; // tiling texture red
Out.Tex6 = inTexCoord0.xy*60; // tiling texture green
Out.Tex7 = inTexCoord0.xy*20; // tiling texture blue
Out.Tex8 = inTexCoord0.xy*40; // tiling texture black

All you need to do is change the 40,60,20,40 to your needs.

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