Sand Pile needed.

[Daemian]

• Make a copy of dirt_pile.dae, call it sand_pile.dae
  
• Open sand_pile.dae, find the lines <image id... <init_from>
  
• Change all that path to your image, just the name. e.g. sand_pile.dds or sand_pile.jpg (just the name matters)
  
• Ready, sand_pile.dae should be functional.
  

Note: Just in case you don't know, you need a .mat for your .dae copy, you can make your own with your image. Just keep the same name you used in step 3. e.g. sand_pile.mat