Every time i use shatter effect in Maya it breaks the object into pieces and leaves after it a lot of unneeded vertices which are useless and don't give a shape to the model. And every time I need to manually delete this vertices to achieve the result in the right. Is there any tool or technique to get rid of that vertices…
Use constraints with propagation set to Angle. Use a value of 1 since its basically a flat surface. With the selection made press Ctrl+Right click -> Edges then go into "Contained Edges". With your edges selected press Ctrl+Del. That will delete selected edges and all asociated vertice alongside it.